High Power Femtosecond Laser Sources For Mid Infrared Generation

Download High Power Femtosecond Laser Sources For Mid Infrared Generation full books in PDF, epub, and Kindle. Read online High Power Femtosecond Laser Sources For Mid Infrared Generation ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!

Emerging Laser Technologies for High-power and Ultrafast Science

Author : François Légaré
Publisher :
ISBN 13 : 9780750325356
Total Pages : 0 pages
Book Rating : 4.3/5 (253 download)

DOWNLOAD NOW!

Book Synopsis Emerging Laser Technologies for High-power and Ultrafast Science by : François Légaré

Download or read book Emerging Laser Technologies for High-power and Ultrafast Science written by François Légaré and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emerging Laser Technologies for High-Power and Ultrafast Science includes chapters from leading experts devoted to the most recent achievements in the field. Including cutting-edge topics such as high energy/high average power laser systems, the most current developments for high repetition rate high average power infrared fiber laser systems, breakthroughs of the development of CPA based on chromium doped zinc selenide gain material, infrared/mid-infrared laser systems based on high average power Ytterbium pumped OPCPA, and generation of ultrashort laser pulses in the UV spectral range. This book will serve as an important reference for students, researchers, scientists, and engineers interested in the development of next generation of ultrafast laser technologies.

Laser-based Mid-infrared Sources and Applications

Author : Konstantin L. Vodopyanov
Publisher : John Wiley & Sons
ISBN 13 : 1119011973
Total Pages : 320 pages
Book Rating : 4.1/5 (19 download)

DOWNLOAD NOW!

Book Synopsis Laser-based Mid-infrared Sources and Applications by : Konstantin L. Vodopyanov

Download or read book Laser-based Mid-infrared Sources and Applications written by Konstantin L. Vodopyanov and published by John Wiley & Sons. This book was released on 2020-06-25 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important guide to the major techniques for generating coherent light in the mid-infrared region of the spectrum Laser-based Mid-infrared Sources and Applications gives a comprehensive overview of the existing methods for generating coherent light in the important yet difficult-to-reach mid-infrared region of the spectrum (2–20 μm) and their applications. The book describes major approaches for mid-infrared light generation including ion-doped solid-state lasers, fiber lasers, semiconductor lasers, and laser sources based on nonlinear optical frequency conversion, and reviews a range of applications: spectral recognition of molecules and trace gas sensing, biomedical and military applications, high-field physics and attoscience, and others. Every chapter starts with the fundamentals for a given technique that enables self-directed study, while extensive references help conduct deeper research. Laser-based Mid-infrared Sources and Applications provides up-to-date information on the state-of the art mid-infrared sources, discusses in detail the advancements made over the last two decades such as microresonators and interband cascade lasers, and explores novel approaches that are currently subjects of intense research such as supercontinuum and frequency combs generation. This important book: • Explains the fundamental principles and major techniques for coherent mid-infrared light generation • Discusses recent advancements and current cutting-edge research in the field • Highlights important biomedical, environmental, and military applications Written for researchers, academics, students, and engineers from different disciplines, the book helps navigate the rapidly expanding field of mid-infrared laser-based technologies.

Laser-based Mid-infrared Sources and Applications

Author : Konstantin L. Vodopyanov
Publisher : John Wiley & Sons
ISBN 13 : 1119011981
Total Pages : 320 pages
Book Rating : 4.1/5 (19 download)

DOWNLOAD NOW!

Book Synopsis Laser-based Mid-infrared Sources and Applications by : Konstantin L. Vodopyanov

Download or read book Laser-based Mid-infrared Sources and Applications written by Konstantin L. Vodopyanov and published by John Wiley & Sons. This book was released on 2020-06-30 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important guide to the major techniques for generating coherent light in the mid-infrared region of the spectrum Laser-based Mid-infrared Sources and Applications gives a comprehensive overview of the existing methods for generating coherent light in the important yet difficult-to-reach mid-infrared region of the spectrum (2–20 μm) and their applications. The book describes major approaches for mid-infrared light generation including ion-doped solid-state lasers, fiber lasers, semiconductor lasers, and laser sources based on nonlinear optical frequency conversion, and reviews a range of applications: spectral recognition of molecules and trace gas sensing, biomedical and military applications, high-field physics and attoscience, and others. Every chapter starts with the fundamentals for a given technique that enables self-directed study, while extensive references help conduct deeper research. Laser-based Mid-infrared Sources and Applications provides up-to-date information on the state-of the art mid-infrared sources, discusses in detail the advancements made over the last two decades such as microresonators and interband cascade lasers, and explores novel approaches that are currently subjects of intense research such as supercontinuum and frequency combs generation. This important book: • Explains the fundamental principles and major techniques for coherent mid-infrared light generation • Discusses recent advancements and current cutting-edge research in the field • Highlights important biomedical, environmental, and military applications Written for researchers, academics, students, and engineers from different disciplines, the book helps navigate the rapidly expanding field of mid-infrared laser-based technologies.

Solid-State Mid-Infrared Laser Sources

Author : Irina T. Sorokina
Publisher : Springer Science & Business Media
ISBN 13 : 3540006214
Total Pages : 600 pages
Book Rating : 4.5/5 (4 download)

DOWNLOAD NOW!

Book Synopsis Solid-State Mid-Infrared Laser Sources by : Irina T. Sorokina

Download or read book Solid-State Mid-Infrared Laser Sources written by Irina T. Sorokina and published by Springer Science & Business Media. This book was released on 2003-07-10 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes the most advanced techniques for generating coherent light in the mid-infrared region of the spectrum. These techniques represent diverse areas of photonics and include heterojunction semiconductor lasers, quantum cascade lasers, tunable crystalline lasers, fiber lasers, Raman lasers, and optical parametric laser sources. Offering authoritative reviews by internationally recognized experts, the book provides a wealth of information on the essential principles and methods of the generation of coherent mid-infrared light and on some of its applications. The instructive nature of the book makes it an excellent text for physicists and practicing engineers who want to use mid-infrared laser sources in spectroscopy, medicine, remote sensing and other fields, and for researchers in various disciplines requiring a broad introduction to the subject.

A New Generation of Ultrafast Oscillators for Mid-Infrared Applications

Author : Nathalie Nagl
Publisher : Springer Nature
ISBN 13 : 3030897540
Total Pages : 155 pages
Book Rating : 4.0/5 (38 download)

DOWNLOAD NOW!

Book Synopsis A New Generation of Ultrafast Oscillators for Mid-Infrared Applications by : Nathalie Nagl

Download or read book A New Generation of Ultrafast Oscillators for Mid-Infrared Applications written by Nathalie Nagl and published by Springer Nature. This book was released on 2022-02-01 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first successful realization of a compact, low-noise, and few-cycle light source in the mid-infrared wavelength region. By developing the technology of pumping femtosecond chromium-doped II-VI laser oscillators directly with the emission of broad-stripe single-emitter laser diodes, coherent light was generated with exceptionally low amplitude noise — crucial for numerous applications including spectroscopy at high sensitivities. Other key parameters of the oscillator's output, such as pulse duration and output power, matched and even surpassed previous state-of-the-art systems. As a demonstration of its unique capabilities, the oscillator's powerful output was used to drive — without further amplification — the nonlinear generation of coherent mid-infrared light spanning multiple octaves. The resulting table-top system uniquely combines high brilliance and ultrabroad spectral bandwidth in the important mid-infrared spectral range. The rapid development of this technology is comprehensively and lucidly documented in this PhD thesis. Together with a thorough review of literature and applications, and an extensive analysis of the theoretical foundations behind ultrafast laser oscillators, the thesis will serve as a valuable reference for the construction of a new generation of mid-infrared light sources.

Mid-Infrared Coherent Sources and Applications

Author : Majid Ebrahim-Zadeh
Publisher : Springer Science & Business Media
ISBN 13 : 140206439X
Total Pages : 630 pages
Book Rating : 4.4/5 (2 download)

DOWNLOAD NOW!

Book Synopsis Mid-Infrared Coherent Sources and Applications by : Majid Ebrahim-Zadeh

Download or read book Mid-Infrared Coherent Sources and Applications written by Majid Ebrahim-Zadeh and published by Springer Science & Business Media. This book was released on 2008-01-02 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering fundamental principles and the state of the art, this is a collection of reviews from experts in mid-infrared (mid-IR) coherent sources. Among the sources covered are optical parametric oscillators, difference frequency generators, and the most recent broadband crystalline, quantum cascade, and fiber lasers. The authors show how advances in mid-IR science and technology make these sources indispensable for a variety of applications.

Biological and Biomedical Infrared Spectroscopy

Author : Andreas Barth
Publisher : IOS Press
ISBN 13 : 1607500450
Total Pages : 448 pages
Book Rating : 4.6/5 (75 download)

DOWNLOAD NOW!

Book Synopsis Biological and Biomedical Infrared Spectroscopy by : Andreas Barth

Download or read book Biological and Biomedical Infrared Spectroscopy written by Andreas Barth and published by IOS Press. This book was released on 2009 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although infrared spectroscopy has been applied with success to the study of important biological and biomedical processes for many years, key advances in this vibrant technique have led to its increasing use, ranging from characterization of individual macromolecules (DNA, RNA, lipids, proteins) to human tissues, cells and their components. Infrared spectroscopy thus has a significant role to play in the analysis of the vast number of genes and proteins being identified by the various genomic sequencing projects. Whilst this book gives an overview of the field, it highlights more recent developments, such as the use of bright synchrotron radiation for recording infrared spectra, the development of two-dimensional infrared spectroscopy and the ability to record infrared spectra at ultra fast speeds.

MID-INFRARED FIBER PHOTONICS

Author : Stuart Jackson
Publisher : Woodhead Publishing
ISBN 13 : 0128180188
Total Pages : 840 pages
Book Rating : 4.1/5 (281 download)

DOWNLOAD NOW!

Book Synopsis MID-INFRARED FIBER PHOTONICS by : Stuart Jackson

Download or read book MID-INFRARED FIBER PHOTONICS written by Stuart Jackson and published by Woodhead Publishing. This book was released on 2021-11-26 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-Infrared Fibre Photonics: Glass Materials, Fibre Fabrication and Processing, Laser Sources and Devicess combines the latest glass chemistry, fibre fabrication and post processing techniques to provide a comprehensive reference on the fundamental science and latest research in fibre photonics for the mid-infrared range. The book systematically reviews the key glass materials systems including fluorides, chalcogenides, and oxides. Each materials chapter includes discussion of composition, structure, thermal, optical and mechanical properties, extrinsic and intrinsic loss mechanisms, materials preparation and purification techniques. Then Mid-Infrared Fibre Photonics: Glass Materials, Fibre Fabrication and Processing, Laser Sources and Devicess covers the most relevant fabrication, post-processing, and spectroscopy techniques. Fibre sources are also addressed including fibre sources for continuous wave emission, pulsed emission, and broadband emission. The book concludes with a brief overview of important medical, sensing and defence applications. - Systematic coverage of the most relevant materials for mid-infrared fibre photonics including discussion of composition, structure, thermal, optical and mechanical properties, loss mechanisms, materials preparation and purification techniques - Reviews the key fabrication and processing techniques of mid-infrared fibre technologies - Addresses the important medical, sensing and defence applications

A New Generation of High-Power, Waveform Controlled, Few-Cycle Light Sources

Author : Marcus Seidel
Publisher : Springer
ISBN 13 : 3030107914
Total Pages : 242 pages
Book Rating : 4.0/5 (31 download)

DOWNLOAD NOW!

Book Synopsis A New Generation of High-Power, Waveform Controlled, Few-Cycle Light Sources by : Marcus Seidel

Download or read book A New Generation of High-Power, Waveform Controlled, Few-Cycle Light Sources written by Marcus Seidel and published by Springer. This book was released on 2019-02-01 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents first successful experiments to carrier-envelope-phase stabilize a high-power mode-locked thin-disk oscillator and to compress the pulses emitted from this laser to durations of only a few-optical cycles. Moreover, the monograph introduces several methods to achieve power-scalability of compression and stabilization techniques. All experimental approaches are compared in detail and may serve as a guideline for developing high-power waveform controlled, few-cycle light sources which offer tremendous potential to exploit extreme nonlinear optical effects at unprecedentedly high repetition rates and to establish table-top infrared light sources with a unique combination of brilliance and bandwidth. As an example, the realization of a multi-Watt, multi-octave spanning, mid-infrared femtosecond source is described. The thesis starts with a basic introduction to the field of ultrafast laser oscillators. It subsequently presents additional details of previously published research results and establishes a connection between them. It therefore addresses both newcomers to, and experts in the field of high-power ultrafast laser development.

Ultrashort Pulse Laser Technology

Author : Stefan Nolte
Publisher : Springer
ISBN 13 : 3319176595
Total Pages : 365 pages
Book Rating : 4.3/5 (191 download)

DOWNLOAD NOW!

Book Synopsis Ultrashort Pulse Laser Technology by : Stefan Nolte

Download or read book Ultrashort Pulse Laser Technology written by Stefan Nolte and published by Springer. This book was released on 2015-10-19 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrashort laser pulses with durations in the femtosecond range up to a few picoseconds provide a unique method for precise materials processing or medical applications. Paired with the recent developments in ultrashort pulse lasers, this technology is finding its way into various application fields. The book gives a comprehensive overview of the principles and applications of ultrashort pulse lasers, especially applied to medicine and production technology. Recent advances in laser technology are discussed in detail. This covers the development of reliable and cheap low power laser sources as well as high average power ultrashort pulse lasers for large scale manufacturing. The fundamentals of laser-matter-interaction as well as processing strategies and the required system technology are discussed for these laser sources with respect to precise materials processing. Finally, different applications within medicine, measurement technology or materials processing are highlighted.

The Supercontinuum Laser Source

Author : Robert R. Alfano
Publisher : Springer Nature
ISBN 13 : 3031061977
Total Pages : 646 pages
Book Rating : 4.0/5 (31 download)

DOWNLOAD NOW!

Book Synopsis The Supercontinuum Laser Source by : Robert R. Alfano

Download or read book The Supercontinuum Laser Source written by Robert R. Alfano and published by Springer Nature. This book was released on 2023-01-01 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, now in its fourth edition, is a well-known classic on the ultrafast nonlinear and linear processes responsible for supercontinuum generation. The book begins with chapters reviewing the experimental and theoretical understanding of the field along with key applications developed since the discovery of the supercontinuum effect. The chapters that follow cover recent research activity on supercontinuum phenomena, novel applications, and advances achieved since the publication of the previous edition. The new chapters focus on: filamentation in gases, air, and condensed media; conical emission by four-wave mixing and X-waves; electronic self-phase mechanism; higher harmonics generation; attosecond laser pulses; complex vector beam supercontinuum; higher order self-phase modulation and cross-phase modulation; nonlinear supercontinuum interference in uniaxial crystals; new nonlinear microscopes involving supercontinuum and ultrafast lasers with biomedical applications; and other current supercontinuum applications in communications. The Supercontinuum Laser Source is a definitive work by one of the discoverers of the white light effect. It is indispensable reading for any researcher or student working in the field of ultrafast laser physics. Chapter 6 is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.

Femtosecond Laser Pulses

Author : Claude Rulliere
Publisher : Springer Science & Business Media
ISBN 13 : 0387017690
Total Pages : 438 pages
Book Rating : 4.3/5 (87 download)

DOWNLOAD NOW!

Book Synopsis Femtosecond Laser Pulses by : Claude Rulliere

Download or read book Femtosecond Laser Pulses written by Claude Rulliere and published by Springer Science & Business Media. This book was released on 2005 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second edition of this advanced textbook written for scientists who require further training in femtosecond science. Four years after pub- cation of the ?rst edition, femtosecond science has overcome new challenges and new application ?elds have become mature. It is necessary to take into account these new developments. Two main topics merged during this period that support important scienti?c activities: attosecond pulses are now gen- ated in the X-UV spectral domain, and coherent control of chemical events is now possible by tailoring the shape of femtosecond pulses. To update this advanced textbook, it was necessary to introduce these ?elds; two new ch- ters are in this second edition: “Coherent Control in Atoms, Molecules, and Solids”(Chap.11)and“AttosecondPulses”(Chap.12)withwell-documented references. Some changes, addenda, and new references are introduced in the ?rst edition’s ten original chapters to take into account new developments and updatethisadvancedtextbookwhichistheresultofascienti?cadventurethat started in 1991. At that time, the French Ministry of Education decided that, in view of the growing importance of ultrashort laser pulses for the national scienti?c community, a Femtosecond Centre should be created in France and devoted to the further education of scientists who use femtosecond pulses as a research tool and who are not specialists in lasers or even in optics.

Handbook of Laser Micro- and Nano-Engineering

Author : KOJI SUGIOKA.
Publisher :
ISBN 13 : 9783319695372
Total Pages : pages
Book Rating : 4.6/5 (953 download)

DOWNLOAD NOW!

Book Synopsis Handbook of Laser Micro- and Nano-Engineering by : KOJI SUGIOKA.

Download or read book Handbook of Laser Micro- and Nano-Engineering written by KOJI SUGIOKA. and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides a comprehensive review of the entire field of laser micro and nano processing, including not only a detailed introduction to individual laser processing techniques but also the fundamentals of laser-matter interaction and lasers, optics, equipment, diagnostics, as well as monitoring and measurement techniques for laser processing. Consisting of 11 sections, each composed of 4 to 6 chapters written by leading experts in the relevant field. Each main part of the handbook is supervised by its own part editor(s) so that high-quality content as well as completeness are assured. The book provides essential scientific and technical information to researchers and engineers already working in the field as well as students and young scientists planning to work in the area in the future. Lasers found application in materials processing practically since their invention in 1960, and are currently used widely in manufacturing. The main driving force behind this fact is that the lasers can provide unique solutions in material processing with high quality, high efficiency, high flexibility, high resolution, versatility and low environmental load. Macro-processing based on thermal process using infrared lasers such as CO2 lasers has been the mainstream in the early stages, while research and development of micro- and nano-processing are becoming increasingly more active as short wavelength and/or short pulse width lasers have been developed. In particular, recent advances in ultrafast lasers have opened up a new avenue to laser material processing due to the capabilities of ultrahigh precision micro- and nanofabrication of diverse materials. This handbook is the first book covering the basics, the state-of-the-art and important applications of the dynamic and rapidly expanding discipline of laser micro- and nanoengineering. This comprehensive source makes readers familiar with a broad spectrum of approaches to solve all relevant problems in science and technology. This handbook is the ultimate desk reference for all people working in the field.

High Power Laser Systems

Author : Masoud Harooni
Publisher : BoD – Books on Demand
ISBN 13 : 1789237408
Total Pages : 224 pages
Book Rating : 4.7/5 (892 download)

DOWNLOAD NOW!

Book Synopsis High Power Laser Systems by : Masoud Harooni

Download or read book High Power Laser Systems written by Masoud Harooni and published by BoD – Books on Demand. This book was released on 2018-10-03 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser is one of the most applicable sources of energy and it can be used in a large variety of applications such as defense, industries and medicine. The special characteristics of this source of energy make it very interesting for different applications. This book includes an interesting and recent collection of relevant research on the development of high-powered laser systems. It includes topics such as using a variety of methods to generate laser pulses in the femtosecond and attosecond range with different wavelengths. This book includes 10 chapters. This book is a very relevant source for researchers as well as engineers working with high-powered laser systems around the world.

Advances in Solid State Lasers

Author : Mikhail Grishin
Publisher : BoD – Books on Demand
ISBN 13 : 953761980X
Total Pages : 642 pages
Book Rating : 4.5/5 (376 download)

DOWNLOAD NOW!

Book Synopsis Advances in Solid State Lasers by : Mikhail Grishin

Download or read book Advances in Solid State Lasers written by Mikhail Grishin and published by BoD – Books on Demand. This book was released on 2010-02-01 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invention of the solid-state laser has initiated the beginning of the laser era. Performance of solid-state lasers improved amazingly during five decades. Nowadays, solid-state lasers remain one of the most rapidly developing branches of laser science and become an increasingly important tool for modern technology. This book represents a selection of chapters exhibiting various investigation directions in the field of solid-state lasers and the cutting edge of related applications. The materials are contributed by leading researchers and each chapter represents a comprehensive study reflecting advances in modern laser physics. Considered topics are intended to meet the needs of both specialists in laser system design and those who use laser techniques in fundamental science and applied research. This book is the result of efforts of experts from different countries. I would like to acknowledge the authors for their contribution to the book. I also wish to acknowledge Vedran Kordic for indispensable technical assistance in the book preparation and publishing.

Interaction Of Mid-infrared Parametric Waves In Laser Plasmas

Author : Rashid Ganeev
Publisher : World Scientific
ISBN 13 : 9813208279
Total Pages : 297 pages
Book Rating : 4.8/5 (132 download)

DOWNLOAD NOW!

Book Synopsis Interaction Of Mid-infrared Parametric Waves In Laser Plasmas by : Rashid Ganeev

Download or read book Interaction Of Mid-infrared Parametric Waves In Laser Plasmas written by Rashid Ganeev and published by World Scientific. This book was released on 2017-02-27 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is interesting to analyze the application of mid-infrared (MIR, 1000-5000 nm) radiation to study the dynamics of the nonlinear optical response of ablated molecular structures compared with commonly used Ti: sapphire lasers for plasma high-order harmonic generation (HHG), including the studies of extended harmonics at a comparable conversion efficiency with shorter wavelength laser sources, and a search for new opportunities in improvement of the HHG conversion efficiency in the mid-IR range, such as the application of clustered molecules. This book shows the most recent findings of various new schemes of the application of MIR pulses for HHG in laser-produced low-ionised, low-density plasma plumes, which could be dubbed for simplicity as 'plasma harmonics'. The use of any element of the periodic table, as well as thousands of complex samples that exist as solids largely extends the range of materials employed, whereas only a few rare gases are typically available for gas HHG. The exploration of practically any solid-state material through the nonlinear spectroscopy comprising laser ablation and harmonic generation can be considered as a new tool for materials science. Thus the MIR pump based laser-ablation-induced high-order harmonic generation spectroscopy can be considered a new method for the study of materials and one of most important applications of plasma HHG.

Femtosecond Laser Spectroscopy

Author : Peter Hannaford
Publisher : Springer Science & Business Media
ISBN 13 : 038723294X
Total Pages : 350 pages
Book Rating : 4.3/5 (872 download)

DOWNLOAD NOW!

Book Synopsis Femtosecond Laser Spectroscopy by : Peter Hannaford

Download or read book Femtosecond Laser Spectroscopy written by Peter Hannaford and published by Springer Science & Business Media. This book was released on 2005-12-27 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The embryonic development of femtoscience stems from advances made in the generation of ultrashort laser pulses. Beginning with mode-locking of glass lasers in the 1960s, the development of dye lasers brought the pulse width down from picoseconds to femtoseconds. The breakthrough in solid state laser pulse generation provided the current reliable table-top laser systems capable of average power of about 1 watt, and peak power density of easily watts per square centimeter, with pulse widths in the range of four to eight femtoseconds. Pulses with peak power density reaching watts per square centimeter have been achieved in laboratory settings and, more recently, pulses of sub-femtosecond duration have been successfully generated. As concepts and methodologies have evolved over the past two decades, the realm of ultrafast science has become vast and exciting and has impacted many areas of chemistry, biology and physics, and other fields such as materials science, electrical engineering, and optical communication. In molecular science the explosive growth of this research is for fundamental reasons. In femtochemistry and femtobiology chemical bonds form and break on the femtosecond time scale, and on this scale of time we can freeze the transition states at configurations never before seen. Even for n- reactive physical changes one is observing the most elementary of molecular processes. On a time scale shorter than the vibrational and rotational periods the ensemble behaves coherently as a single-molecule trajectory.