SPIE LASE最新文献_第8页

Efficient second harmonic generation in an on-chip high-Q crystalline microresonator fabricated by femtosecond laser 用飞秒激光制作的片上高q晶体微谐振器的高效二次谐波产生

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2211895

Jintian Lin, Yingxin Xu, Z. Fang, Min Wang, W. Fang, Ya Cheng

引用次数: 2

Advances in fiber laser spectral beam combining for power scaling 用于功率缩放的光纤激光光谱束组合研究进展

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2214237

E. Honea, R. Afzal, M. Savage-Leuchs, J. Henrie, K. Brar, N. Kurz, D. Jander, N. Gitkind, D. Hu, C. Robin, Andrew M. Jones, Ravi Kasinadhuni, R. Humphreys

引用次数: 56

Alkali D2 line laser optically pumped by two color free-free absorption 碱D2线激光器光抽运两色自由-自由吸收

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2213548

A. Mironov, W. Goldshlag, J. Eden

引用次数: 4

Oxygen assisted iodine atoms production in an RF discharge 氧在射频放电中辅助碘原子的产生

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2218350

P. A. Mikheyev, A. Demyanov, N. I. Ufimtsev, I. Kochetov, V. Azyazov, A. Napartovich, M. Heaven

引用次数: 0

Beam shaping concepts for kW-class CW and QCW diode lasers kw级连续波和QCW二极管激光器的光束整形概念

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2212714

A. Unger, Willhelm Fassbender, H. Muentz, B. Köhler, J. Biesenbach

{"title":"Beam shaping concepts for kW-class CW and QCW diode lasers","authors":"A. Unger, Willhelm Fassbender, H. Muentz, B. Köhler, J. Biesenbach","doi":"10.1117/12.2212714","DOIUrl":"https://doi.org/10.1117/12.2212714","url":null,"abstract":"In modern diode lasers beam shaping of the highly asymmetric laser beam, which exits the front facet of the semiconductor laser material, is a crucial step towards cost efficient high brightness laser modules which in turn can be further combined towards kW-class diode lasers and can be efficiently fiber coupled. In order to scale up the power of a single laser module in an economic way, high fill factor laser bars are employed. The increased power density from such a laser bar requires improved cooling technologies. On the other hand the increased fill factor of the bar makes advanced beam shaping necessary to be able to achieve small focal spot sizes and couple the laser module efficiently into optical fibers. Finally, to be able to mass produce the laser modules, it is desirable to design the module in a way that allows automated packaging and optics alignment. In this talk, the beam shaping concepts developed at DILAS for high fill factor bars are presented. Starting from optical simulation and choice of optical elements the laser modules incorporating these bars are presented. The concepts developed enable very compact laser modules of up to 2kW of power at a single wavelength with beam qualities of less than 40mm x mrad. Optionally these modules can be wavelength stabilized via external feedback. The packaging technology developed enables the automated alignment of the optics and cooling is DI-water free. Based on the same concepts very compact free space and fiber coupled QCW packages are presented as well.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"251 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127010550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Key optical components for spaceborne lasers 星载激光器的关键光学元件

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2212319

J. Löhring, M. Winzen, H. Faidel, J. Miesner, D. Plum, J. Klein, O. Fitzau, M. Giesberts, W. Brandenburg, A. Seidel, N. Schwanen, D. Riesters, S. Hengesbach, H. Hoffmann

{"title":"Key optical components for spaceborne lasers","authors":"J. Löhring, M. Winzen, H. Faidel, J. Miesner, D. Plum, J. Klein, O. Fitzau, M. Giesberts, W. Brandenburg, A. Seidel, N. Schwanen, D. Riesters, S. Hengesbach, H. Hoffmann","doi":"10.1117/12.2212319","DOIUrl":"https://doi.org/10.1117/12.2212319","url":null,"abstract":"Spaceborne lidar (light detection and ranging) systems have a large potential to become powerful instruments in the field of atmospheric research. Obviously, they have to be in operation for about three years without any maintenance like readjusting. Furthermore, they have to withstand strong temperature cycles typically in the range of -30 to +50 °C as well as mechanical shocks and vibrations, especially during launch. Additionally, the avoidance of any organic material inside the laser box is required, particularly in UV lasers. For atmospheric research pulses of about several 10 mJ at repetition rates of several 10 Hz are required in many cases. Those parameters are typically addressed by DPSSL that comprise components like: laser crystals, nonlinear crystals in pockels cells, faraday isolators and frequency converters, passive fibers, diode lasers and of course a lot of mirrors and lenses. In particular, some components have strong requirements regarding their tilt stability that is often in the 10 μrad range. In most of the cases components and packages that are used for industrial lasers do not fulfil all those requirements. Thus, the packaging of all these key components has been developed to meet those specifications only making use of metal and ceramics beside the optical component itself. All joints between the optical component and the laser baseplate are soldered or screwed. No clamps or adhesives are used. Most of the critical properties like tilting after temperature cycling have been proven in several tests. Currently, these components are used to build up first prototypes for spaceborne systems.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126815995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Measurement of pressure broadening of the Kr absorption line at 811.3 nm with a diode laser 用二极管激光测量811.3 nm处Kr吸收谱线的压力增宽

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2218349

P. A. Mikheyev, Alexander K. Churnyshov, N. I. Ufimtsev, Anna R. Ghildina, V. N. Azyazov, M. Heaven

{"title":"Measurement of pressure broadening of the Kr absorption line at 811.3 nm with a diode laser","authors":"P. A. Mikheyev, Alexander K. Churnyshov, N. I. Ufimtsev, Anna R. Ghildina, V. N. Azyazov, M. Heaven","doi":"10.1117/12.2218349","DOIUrl":"https://doi.org/10.1117/12.2218349","url":null,"abstract":"Optically pumped all-rare-gas laser (OPRGL) with unique properties was recently proposed. To study this promising laser system it is necessary to have reliable diagnostics for the active medium. A set of pressure broadening coefficients, for self- and foreign- gas collision partners, is needed for measurements of the number density of metastable atoms and temperature in a rare gas discharge plasma by means of spectroscopy. However, literature analysis had shown that pressure broadening coefficients for rare gas lines in mixtures that are of interest for OPRGL’s are surprisingly hard to find, or were not yet measured. Diode laser absorption spectroscopy was employed for measurements of pressure broadening coefficients for the Krypton 811.3 nm line in an RF discharge. A multi-quantum well diode laser (L808P030, Thorlabs) with an original short external cavity was used as a source of probe radiation. The natural isotopic distribution of Kr was taken into account, and an appropriate fit function was constructed. This permitted the determination of pressure broadening coefficients using the natural mixture of isotopes. The coefficients for the Kr 811.3 nm line at 300 K, measured for the first time, were ξKr-Ne = (1.50 ± 0.05) ×10-10 s-1cm3 for broadening by Neon, and ξKr-Ar = (3.5 ± 0.3) ×10-10 s-1cm3 for broadening by Argon.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134531885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical pumping of the oxygen-iodine laser medium 氧-碘激光介质的光泵浦

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2218412

M. Zagidullin, M. Malyshev, V. Azyazov, M. Heaven

引用次数: 0

Fully automated hybrid diode laser assembly using high precision active alignment 采用高精度主动对准的全自动混合二极管激光组件

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2214718

G. Böttger, D. Weber, F. Scholz, H. Schröder, M. Schneider-Ramelow, K. Lang

引用次数: 12

Specialty flat-top beam delivery fibers with controlled beam parameter product 专用平顶光束输送光纤，光束参数可控产品

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2209348

C. Jollivet, K. Farley, M. Conroy, J. Abramczyk, S. Belke, F. Becker, K. Tankala

{"title":"Specialty flat-top beam delivery fibers with controlled beam parameter product","authors":"C. Jollivet, K. Farley, M. Conroy, J. Abramczyk, S. Belke, F. Becker, K. Tankala","doi":"10.1117/12.2209348","DOIUrl":"https://doi.org/10.1117/12.2209348","url":null,"abstract":"Beam delivery fibers have been used widely for transporting the optical beams from the laser to the subject of irradiation in a variety of markets including industrial, medical and defense applications. Standard beam delivery fibers range from 50 to 1500 μm core diameter and are used to guide CW or pulsed laser light, generated by solid state, fiber or diode lasers. Here, we introduce a novel fiber technology capable of simultaneously controlling the beam profile and the angular divergence of single-mode (SM) and multi-mode (MM) beams using a single-optical fiber. Results of beam transformation from a SM to a MM beam with flat-top intensity profile are presented in the case of a controlled BPP at 3.8 mm*mrad. The scaling capabilities of this flat-top fiber design to achieve a range of BPP values while ensuring a flat-top beam profile are discussed. In addition, we demonstrate, for the first time to the best of our knowledge, the homogenizer capabilities of this novel technology, able to transform random MM beams into uniform flat-top beam profiles with very limited impact on the beam brightness. This study is concluded with a discussion on the scalability of this fiber technology to fit from 50 up to 1500 μm core fibers and its potential for a broader range of applications.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133041687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2