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Author : Matthias Fuchs
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (157 download)
Download or read book Development of a High Power Stablized Diode Laser System written by Matthias Fuchs and published by . This book was released on 2006 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bodo Ehlers
Publisher :
ISBN 13 : 9783832245726
Total Pages : 111 pages
Book Rating : 4.2/5 (457 download)
Download or read book Development of High Power Diode Laser Systems written by Bodo Ehlers and published by . This book was released on 2005 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roland Diehl
Publisher : Springer Science & Business Media
ISBN 13 : 3540478523
Total Pages : 420 pages
Book Rating : 4.5/5 (44 download)
Download or read book High-Power Diode Lasers written by Roland Diehl and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from the basics of semiconductor lasers with emphasis on the generation of high optical output power the reader is introduced in a tutorial way to all key technologies required to fabricate high-power diode-laser sources. Various applications are exemplified.
Author : Thi Nghiem Vu
Publisher : Cuvillier Verlag
ISBN 13 : 3736984804
Total Pages : 138 pages
Book Rating : 4.7/5 (369 download)
Download or read book Development and analysis of diode laser ns-MOPA systems for high peak power application written by Thi Nghiem Vu and published by Cuvillier Verlag. This book was released on 2017-02-14 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work aims at designing and characterizing diode laser based master oscillator power amplifier (MOPA) systems, which are targeted to be implemented into micro light detection and ranging (LIDAR) or differential absorption LIDAR (DIAL) systems for water vapor and aerosol detections. These light sources operate in the ns-pulse regime at a repetition rate of 25 kHz, leading to a resolution in the meter range in an altitude of 6 km. The monolithic MOPA, where Master Oscillator (MO) and Power Amplifier (PA) are integrated on one single chip, operates at 1064 nm wavelength. A peak power of 16.3 W with a pulse width of 3 ns was obtained. A spectral linewidth of about 150 pm and a side mode suppression ratio (SMSR) of 30 dB was observed. A ratio of 9% between the amplified spontaneous emission (ASE) and the laser was estimated. These spectral properties fulfill the requirements for aerosol detection. The hybrid MOPA systems have separate chips for MO and PA. Different hybrid MOPA systems provide a stabilized wavelength at 1064 nm, a tunable wavelength around 975 nm and a dual wavelength around 964 nm. They therefore enable to detect a well-defined absorption line, scan over absorption line and switch between on/off line in DIAL applications, respectively. Their spectral linewidth is below 10 pm, limited by the resolution of the spectrum analyzer. An SMSR of more than 50 dB for the MO and of more than 37 dB for the whole MOPA was reached. A ratio between ASE and laser below 1% was estimated. These spectral properties meet the requirements for water vapor absorption lines detection at atmospheric condition. Diode laser based MOPA systems were therefore proven to be potential light sources for micro-pulse-LIDAR systems – the basis for a new generation of ultra-compact, low-cost systems.
Author : Jonathan Decker
Publisher : Cuvillier Verlag
ISBN 13 : 3736987986
Total Pages : 174 pages
Book Rating : 4.7/5 (369 download)
Download or read book Investigation of monolithically integrated spectral stabilization in high-brightness broad area diode lasers written by Jonathan Decker and published by Cuvillier Verlag. This book was released on 2018-06-06 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-power distributed feedback broad area (DFB-BA) lasers are key components for pumping narrow absorption bands in solid-state lasers and for brightness scaling in direct diode laser systems via dense spectral beam combining. Today, the market for these lasers is dominated by DFB-BA lasers with low-order Bragg gratings that are integrated via buried overgrowth techniques. A promising alternative are DFB-BA lasers with high order grat-ings that are directly etched into the p-side of the epitaxial layer structure, so that no interruption of the epitaxial growth process is required. Prior to this work, studies of such DFB-BA lasers were restricted to experimental proof-of-principal realizations. Further, adequate simulation tools were not available, as surface-etched gratings introduce a high refractive index contrast and can therefore not be calculated directly within the coupled mode theory (CMT). Hence, this work treats the development of efficient high-bright-ness DFB-BA lasers and laser arrays with surface-etched gratings at 975 nm. The development of these lasers encompasses three steps: First, a design study of high-brightness Fabry-Pérot laser diodes that are suitable for the integration of surface-etched gratings. Second, the implementation of an adequate numerical model for the simulation of high-order surface-etched DFB grat-ings. Therefore, a simulation based on CMT is extended by bi-directional eigenmode expansion and propagation modelling. And third, a comprehensive experimental study of spectrally stabilized high-brightness DFB-BA lasers. Optimized DFB-BA lasers (L = 6 mm, W = 30 µm) operate with 56% peak conversion efficiency and achieve 5.8 W output power with a slow-axis beam parameter product ≤ 1.8 mm×mrad, and a linewidth ≤ 1.0 nm.
Author : Heike Christopher
Publisher : Cuvillier Verlag
ISBN 13 : 3736963998
Total Pages : 206 pages
Book Rating : 4.7/5 (369 download)
Download or read book A compact mode-locked diode laser system for high precision frequency comparison experiments (Band 64) written by Heike Christopher and published by Cuvillier Verlag. This book was released on 2021-04-09 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical frequency combs (OFC) have revolutionized various applications in applied and fundamental sciences that rely on the determination of absolute optical frequencies and frequency differences. The latter requires only stabilization of the spectral distance between the individual comb lines of the OFC, allowing to tailor and reduce system complexity of the OFC generator (OFCG). One such application is the quantum test of the universality of free fall within the QUANTUS experimental series. Within the test, the rate of free fall of two atomic species, Rb and K, in micro-gravity will be compared. The aim of this thesis was the development of a highly compact, robust, and space-suitable diode laser-based OFCG with a mode-locked optical spectrum in the wavelength range around 780 nm. A diode laser-based OFCG was developed, which exceeds the requirements with a spectral bandwidth > 16 nm at 20 dBc, a comb line optical power > 650 nW (at 20 dBc), a pulse repetition rate of 3.4 GHz, and an RF linewidth of the free-running pulse repetition rate < 10 kHz. To realize a proof-of-concept demonstrator module, the diode laser-based OFCG was hybrid-integrated into a space-suitable technology platform that has been developed for future QUANTUS experiments. Proof of sufficient RF stability of the OFCG was provided by stabilizing the pulse repetition rate to an external RF reference. This resulted in a stabilized pulse repetition rate with an RF linewidth smaller than 1.4 Hz (resolution limited), thus exceeding the requirement. The developed diode laser-based OFCG represents an important step towards an improved comparison of the rate of free fall of Rb and K quantum gases within the QUANTUS experiments in micro-gravity.
Author : Thorben Kaul
Publisher : Cuvillier Verlag
ISBN 13 : 3736963963
Total Pages : 136 pages
Book Rating : 4.7/5 (369 download)
Download or read book Epitaxial Design Optimizations for Increased Efficiency in GaAs-Based High Power Diode Lasers written by Thorben Kaul and published by Cuvillier Verlag. This book was released on 2021-04-09 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents progress in the root-cause analysis of power saturation mechanisms in continuous wave (CW) driven GaAs-based high-power broad area diode lasers operated at 935 nm. Target is to increase efficiency at high optical CW powers by epitaxial design. The novel extreme triple asymmetric (ETAS) design was developed and patented within this work to equip diode lasers that use an extremely thin p-waveguide with a high modal gain. An iterative variation of diode lasers employing ETAS designs was used to experimentally clarify the impact of modal gain on the temperature dependence of internal differential quantum efficiency (IDQE) and optical loss. High modal gain leads to increased free carrier absorption from the active region. However, less power saturation is observed, which must then be attributed to an improved temperature sensitivity of the IDQE. The effect of longitudinal spatial hole burning (LSHB) leads to above average non-linear carrier loss at the back facet of the device. At high CW currents the junction temperature rises. Therefore, not only the asymmetry of the carrier profile increases but also the average carrier density in order to compensate for the decreased material gain and increased threshold gain. This carrier non-pinning effect above threshold is found in this work to enhance the impact of LSHB already at low currents, leading to rapid degradation of IDQE with temperature. This finding puts LSHB into a new context for CW-driven devices as it emphasizes the importance of low carrier densities at threshold. The carrier density was effectively reduced by applying the novel ETAS design. This enabled diode lasers to be realized that show minimized degradation of IDQE with temperature and therefore improved performance in CW operation.
Author : Andrew Shiner
Publisher :
ISBN 13 : 9780494296141
Total Pages : 127 pages
Book Rating : 4.2/5 (961 download)
Download or read book Development of a Frequency Stabilized 422-nm Diode-laser System and Its Application to a Strontium-88 Single Ion Optical Frequency Standard written by Andrew Shiner and published by . This book was released on 2006 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: A frequency standard based on a laser source probing an ultra narrow optical transition in a single trapped and laser-cooled 88Sr+ ion is under development at the National Research Council of Canada. This thesis consists of the development of a new frequency-stabilized diode-laser system at 422 nm which has been used for Doppler laser cooling of the ion as well as fluorescence detection of the ion's electronic state. The linewidth of this source has been narrowed to 2 MHz and its absolute frequency has remained stabilized to an atomic reference transition for periods exceeding 12 hours. Results using this new source are presented demonstrating a significant reduction in ion temperature enabling the linewidth of its ultranarrow transition to be resolved at the Hz level. Measurements of the absolute optical transition frequencies between hyperfine components of the 5s 2S1/2--6p 2P1/2 transition in both 85Rb and 87Rb at 422 nm are also presented.
Author : Ivan Divliansky
Publisher : Institution of Engineering and Technology
ISBN 13 : 1785617516
Total Pages : 400 pages
Book Rating : 4.7/5 (856 download)
Download or read book Advances in High-Power Fiber and Diode Laser Engineering written by Ivan Divliansky and published by Institution of Engineering and Technology. This book was released on 2019-12-30 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in High-Power Fiber and Diode Laser Engineering provides an overview of recent research trends in fiber and diode lasers and laser systems engineering. In recent years, many new fiber designs and fiber laser system strategies have emerged, targeting the mitigation of different problems which occur when standard optical fibers are used for making high-power lasers. Simultaneously, a lot of attention has been put to increasing the brightness and the output power of laser diodes. Both of these major laser development directions continue to advance at a rapid pace with the sole purpose of achieving higher power while having excellent beam quality. The book begins by introducing the principles of diode lasers and methods for improving their brightness. Later chapters cover quantum cascade lasers, diode pumped high power lasers, high average power LMA fiber amplifiers, high-power fiber lasers, beam combinable kilowatt all-fiber amplifiers, and applications of 2 μm thulium fiber lasers and high-power GHz linewidth diode lasers. Written by a team of authors with experience in academia and industrial research and development, and brought together by an expert editor, this book will be of use to anyone interested in laser systems development at the laboratory or commercial scale.
Author : Kelin J. Kuhn
Publisher :
ISBN 13 :
Total Pages : 227 pages
Book Rating : 4.:/5 (386 download)
Download or read book Research and Development of a High Average Power Photoprocessing Laser System written by Kelin J. Kuhn and published by . This book was released on 1985 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Friedrich Bachmann
Publisher : Springer
ISBN 13 : 0387347291
Total Pages : 553 pages
Book Rating : 4.3/5 (873 download)
Download or read book High Power Diode Lasers written by Friedrich Bachmann and published by Springer. This book was released on 2007-05-26 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes a five year research project, as well as subsequent results regarding high power diode laser systems and their application in materials processing. The text explores the entire chain of technology, from the semiconductor technology, through cooling mounting and assembly, beam shaping and system technology, to applications in the processing of such materials as metals and polymers. Includes theoretical models, a range of important parameters and practical tips.
Author : Thi Nghiem Vu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (14 download)
Download or read book Development and analysis of diode laser ns-MOPA systems for high peak power applications written by Thi Nghiem Vu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jeremy L. Wujcik
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (364 download)
Download or read book The Development of Diode Laser System for Use in the Fluorescence of Lithium written by Jeremy L. Wujcik and published by . This book was released on 1996 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. Forbes Dewey (Jr)
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (227 download)
Download or read book Development of a Powerful, Wavelength-Tunable Laser System written by C. Forbes Dewey (Jr) and published by . This book was released on 1974 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objectives of this research program were to develop a high-power, continuously-tunable infrared laser system for the 2 micrometers - 20 micrometers region of the spectrum and to advance the fundamental technologies which underlie the practical realization and applications of such a system.
Author :
Publisher :
ISBN 13 :
Total Pages : 97 pages
Book Rating : 4.:/5 (55 download)
Download or read book High Average Power Diode Pumped Solid State Lasers: Power Scaling With High Spectral and Spatial Coherence written by and published by . This book was released on 2009 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main program objective was the development of a kilowatt class, cw Nd:YAG diode-laser-pumped solid-state laser (DPSSL) with quantum noise limited amplitude and phase, 24by7 operation capability and the ability to be repaired while in operation. The approach was a master-oscillator power-amplifier (MOPA) laser utilizing a series of zig-zag slab power amplifiers stages. We developed fiber amplifiers at the 200W level to generate power with high optical efficiency that can effectively extract energy from the power amplifier slabs. We also worked on the generation of high average power visible light by developing nonlinear optical materials with large apertures, low photo-refraction and minimal visible induced infrared absorption. The second objective was to develop a 1 joule, pulse-modulated, diffraction limited MOPA laser with less than 1 MHz line-width. A follow-on objective was frequency conversion to 1.5 or 2.0 microns for remote sensing applications. We demonstrated Yb:YAG slab lasers pumped with high brightness laser diodes. Supporting this project was the development of laser diodes operating in the 1.5 micron region for pumping of erbium doped laser hosts, and the synthesis of new low-loss polycrystalline laser host materials for in-band pumping into the upper laser level to improve the laser efficiency at eye-safe wavelengths. We developed orientation patterned Ga-As to frequency convert high peak power 1-micron radiation to eye-safe wavelengths in the mid-infrared for defense applications. The third objective, power scaling and determining the potential for phase-locking of ultra-fast laser systems for a wide range of sensing and machining applications, was demonstrated as well.
Author : John T. Sullivan
Publisher : Springer Nature
ISBN 13 : 3031378180
Total Pages : 825 pages
Book Rating : 4.0/5 (313 download)
Download or read book Proceedings of the 30th International Laser Radar Conference written by John T. Sullivan and published by Springer Nature. This book was released on 2023-12-26 with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents papers from the biennial International Laser Radar Conference (ILRC), the world’s leading event in the field of atmospheric research using lidar. With growing environmental concerns to address such as air quality deterioration, stratospheric ozone depletion, extreme weather events, and changing climate, the lidar technique has never been as critical as it is today to monitor, alert, and help solve current and emerging problems of this century. The 30th occurrence of the ILRC unveils many of the newest results and discoveries in atmospheric science and laser remote sensing technology. The 30th ILRC conference program included all contemporary ILRC themes, leveraging on both the past events’ legacy and the latest advances in lidar technologies and scientific discoveries, with participation by young scientists particularly encouraged. This proceedings volume includes a compilation of cutting-edge research on the following themes: new lidar techniques and methodologies; measurement of clouds and aerosol properties; atmospheric temperature, wind, turbulence, and waves; atmospheric boundary layer processes and their role in air quality and climate; greenhouse gases, tracers, and transport in the free troposphere and above; the upper mesosphere and lower thermosphere; synergistic use of multiple instruments and techniques, networks and campaigns; model validation and data assimilation using lidar measurements; space-borne lidar missions, instruments and science; ocean lidar instrumentation, techniques, and retrievals; and past, present and future synergy of heterodyne and direct detection lidar applications. In addition, special sessions celebrated 50 years of lidar atmospheric observations since the first ILRC, comprising review talks followed by a plenary discussion on anticipated future directions.
Author : Frevert Carlo
Publisher :
ISBN 13 : 9783736999442
Total Pages : 174 pages
Book Rating : 4.9/5 (994 download)
Download or read book Optimization of Broad-area GaAs Diode Lasers for High Powers and High Efficiencies in the Temperature Range 200-220 K written by Frevert Carlo and published by . This book was released on 2019-07-11 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on the development of AlGaAs-based diode laser (DL) bars optimized for reaching highest powers and efficiencies at low operation temperatures. Specifically, the quasi continuous wave (QCW) pumping of cryogenically cooled Yb: YAG solid-state lasers is targeted, setting requirements on the wavelength (940 nm), the pulse conditions (pulse length 1.2 ms) and frequency (10 Hz) as well as the lowest DL operating temperature THS 200 K, consistent with economic cooling. High fill-factor bars for QCW operation are to reach high optical performance with optical output powers of P 1.5 kW and power conversion efficiencies of ŋE 60% at these power levels. Understanding the efficiency-limiting factors and the behavior at lower temperatures is necessary to design these devices. Optimizations are performed iteratively in three stages. First, vertical epitaxial designs are studied theoretically, adjusted to the targeted operation temperatures and specific laser parameters are extracted. Secondly, resulting vertical designs are processed into low power single emitters and their electro-optical behavior at low currents is experimentally assessed over a wide range of temperatures. The obtained laser parameters characteristic to the vertical design are then used to extrapolate the laser's performance up to the high targeted currents. Finally, vertical designs promising to reach the targeted values for power and efficiency are processed into high power single emitters and bars which are measured up to the highest currents. Eventually, laser bars are fabricated reaching output powers of 2 kW and efficiencies of 61% at 1.5 kW at an operation temperature of 203 K.
