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检索条件"任意字段=Conference on High-Power Diode Laser Technology and Applications XII"

共 1431 条记录，以下是91-100 订阅

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Multi-Joule Energy Extraction in diode-Pumped Tm:YLF 31

Multi-Joule Energy Extraction in Diode-Pumped Tm:YLF

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conference on Solid State lasers XXXI - technology and Devices

作者： Tamer, Issa Reagan, Brendan A. Galvin, Thomas Galbraith, Justin Sistrunk, Emily Church, Andrew Huete, Glenn Neurath, Hansel Willard, Drew Spinka, Thomas Lawrence Livermore Natl Lab Livermore CA 94550 USA

ISBN: (纸本)9781510648326;9781510648319

We present the first demonstration of a multi-joule diode-pumped Tm:YLF amplifier. The compact demonstrator setup, consisting of a Tm:YLF-based oscillator producing similar to 20mJ, 20ns pulses at 1880nm wavelength that seeds a diode-pumped four-pass Tm:YLF power amplifier, generated pulse energies up to 3.9J with a maximum net gain exceeding 200. No saturation effects were observed within this amplifier, as the output pulse energies increased exponentially with the input pump power. When the amplifier was seeded with the free-running oscillator, with pulse durations still significantly shorter than the 15ms radiative lifetime of Tm:YLF, energies of up to 38J were achieved. To the best of our knowledge, this represents over a 100-fold improvement in the highest reported pulse energy from a Tm:YLF amplifier, and nearly an order of magnitude higher energy than any laser operating near 2 mu m. These results show that Tm:YLF, when operated in an efficient high repetition rate extraction regime and combined with a high-capacity heat removal technique, has the potential to enable a new class of efficient, high peak and average power laser systems to meet the demands of next generation scientific and industrial applications.

关键词： lasers thulium Tm:YLF high energy high average power diode-pumped DPSSL

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Multimode diode-pumped graded-index fiber Raman laser with pulsed generation in all-fiber scheme 12

Multimode diode-pumped graded-index fiber Raman laser with p...

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conference on Advanced lasers, high-power lasers, and applications xii

作者： Kuznetsov, Alexey G. Kablukov, S., I Babin, Sergey A. Inst Automat & Electrometry SB RAS 1 Koptyug Ave Novosibirsk 630090 Russia Novosibirsk State Univ 2 Pirogova Str Novosibirsk 630090 Russia

ISBN: (数字)9781510646308

ISBN: (纸本)9781510646308;9781510646292

We report on a pulsed regime of Raman laser with all-fiber cavity scheme based on a multimode graded-index fiber directly pumped by a CW multimode laser diode. The cavity was performed with 3.7 km 62.5/125 MM graded-index fiber with two FBGs on the both sides of it. Intra-cavity acousto-optic modulator pigtailed with 10/125 fiber allowed to obtain mode locking regime. At 27.19-kHz repetition rate corresponding to the laser cavity round-trip frequency (corresponding to mode-locking regime), stable nanosecond pulses with 6.3 W peak power have been observed at the 1st (1018 nm) Stokes order. The beam quality of generated pulses is greatly improved as compared to that for pump diode (M-2 >20) reaching M-2 =2.86 for the 1St Stokes and M-2 =2.08 for the 2nd Stokes beams.

关键词： fiber laser Raman laser beam clean-up graded-index fiber diode pumping

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Lasing Mode Design of 1550nm Triple Junction laser diode for Timeof-Flight LiDAR and LRF 23

Lasing Mode Design of 1550nm Triple Junction Laser Diode for...

引用

2025 conference on high power diode laser technology-Annual

作者： Aboujja, Sidi Chu, Daniel SemiNex Corp 153 Andover StSuite 201 Danvers MA 01923 USA

ISBN: (纸本)9781510684386;9781510684393

Our proprietary Triple Junction laser diode at eye-safe 1550nm based on AlInGaAs/InP material systems can achieve high performances in LiDAR (light detection and range) and LRF (laser range finding) applications. Three monolithic laser structures with tunnel junction layers are designed to reduce mechanical stress with superior heat dissipation. It achieves 3x output power and 2x wall plug efficiency of a single junction with low operating voltage and high slope efficiency at 1W/A. The life test of Triple Junction laser diodes demonstrated long life under stressed electrical and thermal condition, almost 20 times higher than standard operation for automotive LiDAR. The reliability data based on Arrhenius conditions shows the estimated MTTF (mean time to failure) is 75k hours at 20 degrees C and 17k hours at 50 degrees C operating temperature, which is respectively 9.3x and 2.5x more than the required 8k hours in automotive applications. [1][2] laser Radar or LiDAR systems rely on the illumination of the far-field by the laser source to provide an accurate sampling of the object at a given distance. A triple junction diode laser can be designed to provide a single illumination spot in the far field by minimizing the tunnel junction absorption and optimizing the distance between the individual laser diodes. In this paper we report our further investigation on the optical modes and their characterizations, as we optimize the 1550nm Triple Junction laser diodes for various applications. It is noted that as we fine tune the quantum well stacks and the tunnel junctions, we can manipulate the lasing characteristics and the optical modes in each junction. We present various lasing modes under optimized design attributes, and how each lasing mode would contribute to the beam profile and the far field characteristics. This is the first time such design and analysis has been conducted on 1550nm Triple Junction high power laser diodes.

关键词： 1550nm edge emitting farfield high power laser diode IR LiDAR life test Mean time to failure MTTF multi-junction nearfield reliability triple junction tunnel junction

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Novel laser-diode Based White Light Source with Increased Radiant flux 11

Novel Laser-Diode Based White Light Source with Increased Ra...

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Joint conference on 11th International conference on Energy Efficiency in Domestic Appliances and Lighting and 17th International Symposium on the Science and technology of Lighting, EEDAL/LS:17 2022

作者： Nick, Rondelez Youri, Meuret Light and Lighting Laboratory Ghent Belgium

ISBN: (纸本)9782492754005

Novel high-luminance light sources are being investigated for applications such as car headlights and street lighting. The availability of efficient and powerful blue laser diodes, makes it possible to realize phosphor converted white light sources with an extremely high source luminance. In this paper, we demonstrate a system with high-power laser diodes emitting up to 76 W, and a remote phosphor, of which the outcoupling efficiency is improved by 146& by addition of a sapphire half-ball lens. A theoretical limit of over 16000 lm is possible at a CCT of 4800 K. © 2022 UniversitÃ

关键词： Sapphire

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Sub-bin histogram peak detection for the direct time-of-flight SPAD-based laser ranging systems with millimeter range precision 8

Sub-bin histogram peak detection for the direct time-of-flig...

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8th International conference on Speckle Metrology, Speckle 2023

作者： Ma, Ning He, Mengfan Zhao, Juan Hangzhou Parity Microelectronics Co. Ltd Hangzhou310051 China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China

ISBN: (数字)9781510674592

ISBN: (纸本)9781510674585

Direct time-of-flight (dToF) Lidar system based on single photon avalanche diode (SPAD) sensor plays a key role in the range finding applications because of its high sensitivity, low power consumption and high integrity. The travel time of photons backscattered from a distant target will be measured by the time-to digital-converters (TDC) to create a histogram whose peak location indicates the target distance. However, the bin width of histogram determined by the TDC's time resolution (LSB) limits the precision of distance measurement. Therefore, sub-bin interpolation methods are introduced to facilitate super precision on-chip distance estimation. The balance between the performance and algorithm complexity must be kept very carefully, to maintain acceptable circuit area occupied, the power consumption and yet not to severely degrade performance. In this paper, we present the experimental results obtained from single point Lidar system composing of the Hangzhou Parity's MPX102Q SPAD sensor as the receiver and a VCSEL pulse emitter as the transmitter. Several interpolation methods like the simple centroid or center-of-mass (CM) algorithm, and the gaussian mask centroid are applied to process raw histograms. The interpolation results of different algorithms are compared with the direct peak location method to examine their performance including distance resolution and ranging accuracy in different situations. Both sub-bin depth resolution, together with high precision and accuracy (mm level) covering a range up to 15m are achieved by this sensor containing integrated circuits for sub-bin interpolation, and this sensor is with potential to benefit the price-sensitive and power-constrained consumer products like sweeping robots. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Interpolation

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Advancements in GaN DFBs with embedded gratings and a path to higher power 23

Advancements in GaN DFBs with embedded gratings and a path t...

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2025 conference on high power diode laser technology-Annual

作者： Anderson, Ryan Lee, Seunggeun Trageser, Emily Brown, Josh D. Zhang, Amy Zhang, Bin Huang, Carol Massimino, Tanner Gao, Qian Fernandes, Alanna Pinzone, Christopher J. Siskavich, Brad Mann, Ian DenBaars, Steven P. Nakamura, Shuji Haden, Jim BluGlass Ltd 74 Asquith St Silverwater NSW 2128 Australia Univ Calif Santa Barbara Mat Dept Santa Barbara CA 93107 USA

ISBN: (纸本)9781510684386;9781510684393

GaN-based distributed feedback (DFB) laser diodes are narrow linewidth sources promising for integration into low-size, weight, and power photonic circuits. There is a need to improve the linewidth, expand the availability of technologically useful wavelengths, and increase the power and efficiency for several applications. BluGlass presents advancements in visible wavelength DFB lasers. We will show measured device results achieving higher side-mode-suppression ratio of 40 dB and a peak full-width half maximum under 3 pm demonstrating near single frequency emission. Devices targeting critical atomic transition wavelengths for clocks, quantum computing, and other cold physics applications are covered spanning from 408 nm to 470 nm. A path toward narrow-band high-power DFB sources will be presented with preliminary data on gain in GaN-based semiconductor optical amplifiers.

关键词： GaN laser diode DFB SOA MOPA

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highly reliable, multi-watt continuous wave GaSb-based broad area diode lasers emitting around 2 μm 23

Highly reliable, multi-watt continuous wave GaSb-based broad...

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2025 conference on high power diode laser technology-Annual

作者： Boni, A. Wegelin, M. Fahrentz, F. Kaebe, A. Lumics GmbH Schwarze Pumpe Weg 16 D-12681 Berlin Germany

ISBN: (纸本)9781510684386;9781510684393

We have developed multi-watt continuous wave laser diodes based on the InGaSb/GaSb material system, emitting at an operating wavelength of 1.94 mu m for a wide range of medical/life science and industrial applications. high conversion efficiency, multi-watt output power, efficient fiber coupling, and extended lifetime are the primary requirements for these applications. The vertical design is epitaxially grown by molecular beam epitaxy (MBE), consisting of InGaSb multi quantum wells (MQWs) with GaSb barriers. This optimized vertical design is fabricated into single emitters with a 190 mu m stripe width and a 2.5 mm resonator length, and mounted p-side down on a CuW heatsink (thermal resistance = 3 K/W). The single emitter exhibits an output power of 2 W at 9.6 A with a power conversion efficiency of 23%, showing a peak power conversion efficiency of 29% at 4 A in continuous wave (CW) mode at T = 25 degrees C. The slope efficiency decreases from 0.27 to 0.20 W/A as the current increases from 4 A to the peak saturation current of 9.6 A. We performed a lifetime test at the maximum power level at 23 degrees C for 30 devices over 1000 hours. None of these devices showed any performance degradation due to catastrophic optical damage (COD) or catastrophic optical mirror damage (COMD).

关键词： Broad area lasers Mid-infrared lasers Antimonides GaSb InGaSb/GaSb diode laser high power epitaxial design semiconductor

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laser echo decoherence characteristics of rough plane in heterodyne detection with truncated GSM beam 12

Laser echo decoherence characteristics of rough plane in het...

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conference on Advanced Sensor Systems and applications xii

作者： Dong, Xiao Hu, Yihua Zhao, Nanxiang Xu, Shilong Natl Univ Def Technol State Key Lab Pulsed Power Laser Technol 460 Huangshan Rd Hefei Peoples R China Natl Univ Def Technol Key Lab Elect Restrict Anhui Prov 460 Huangshan Rd Hefei Peoples R China

ISBN: (纸本)9781510657090;9781510657083

Rough target can cause the wavefront distortion of laser return, which shows the decoherence phenomenon and reduces the detection performance of heterodyne lidar systems. In fact, the decoherece process includes both the laser source and the rough target. The actual laser beams are usually partially coherent, and the atmospheric turbulence aggravates the coherence of laser spots on the rough target and the backscattered laser return. The backscattered laser field of rough plane is derived based on the GSM beam and the generalized Huygens-Fresnel principle. And the beam truncation effect of actual optical transceiver is also analyzed by using the hard edge aperture function. The laser return intensity variations are obtained by considering the laser beam coherence, the rough surface height fluctuation and the atmospheric turbulence. Then decoherence effects are calculated via the complex coherence degree under typical roughness parameters and laser wavelengths. For practical target, the complex coherence degree can be approximated by the Dirac delta function, and then the system efficiency and the effective coherent solid angle can also be used for further analyses. The results show a positive correlation between the decoherence effect and the roughness. The research on the scattering characteristics of rough planes expands the scattering theory and provides a reference for the design and analysis of long-range and high-precision heterodyne lidar system.

关键词： heterodyne lidar atmospheric turbulence partially coherent light rough target

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high efficiency 600 W, 100 μm wavelength stabilized fiber coupled laser diode module for fiber laser pumping 19

High efficiency 600 W, 100 μm wavelength stabilized fiber c...

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conference on high-power diode laser technology XIX

作者： Yu, Hao Tan, Shaoyang Pan, Huadong Sun, Shujuan Li, Juan Wang, Jun Sichuan Univ 24 South Sect 1Yihuan Rd Chengdu 610065 Peoples R China Suzhou Everbright Photon Co Ltd Bldg 2189 Kunlunshan Rd Suzhou 215163 Peoples R China

ISBN: (数字)9781510641723

ISBN: (纸本)9781510641723

high brightness, high efficiency laser sources become more and more promising in diode laser applications for fiber laser pumping and materials processing. Dense wavelength beam combining (DWBC) technology has great advantages over other beam combining technologies as the brightness is significantly improved. However, the brightness and efficiency of DWBC technology based on laser diode bars are naturally limited by the laser source due to smile effect and low polarization ratio. By employing single emitter based DWBC technology and optimizing the optical design, a laser diode module capable of delivering above 600 W at 976 nm in a 0.22 NA 100/120 fiber is developed and 48% power conversion efficiency is achieved. The maximal power conversion efficiency, 51%, is reached at 400 W output. The intrinsic wavelength stabilization of DWBC technology allows the use of the module for efficiently pumping.

关键词： high brightness high efficiency fiber coupled laser diode dense wavelength beam combining polarization combining single emitter

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Drone Demonstrator Phase of a Photon Counting Pulse Train Lidar through the Use of diodes lasers

Drone Demonstrator Phase of a Photon Counting Pulse Train Li...

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IEEE Photonics conference (IPC)

作者： Emma Le Francois Haochang Chen Steven Hancock Jack Thomas Fraunhofer Centre for Applied Photonics / Fraunhofer UK Research Ltd. Glasgow UK School of GeoSciences / University of Edinburgh Edinburgh UK

ISBN: (数字)9798350361957

ISBN: (纸本)9798350361964

Current satellite lidars have sparse spatial coverage which is prohibitive for many applications requiring continuous coverage. These use solid-state lasers which are bulky and have a low efficiency. Emerging high power and high brightness diode laser technology alongside single photon detectors provide a means of reaching continuous coverage of a lidar system whilst reducing weight, complexity and cost. In this work, we demonstrate by developing a drone demonstrator that a pulse train diode laser lidar can be robust to noise and provide enough energy for an in-orbit system.

关键词： laser radar Satellites Costs Semiconductor lasers laser noise Photon detectors diode lasers Complexity theory laser applications Drones

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