SPIE LASE最新文献_第7页

Thermal lensing measurement from the coefficient of defocus aberration using Shack-Hartmann wavefront sensor 基于散焦像差系数的Shack-Hartmann波前传感器热透镜测量

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2205141

Teboho Bell, D. Naidoo, S. Ngcobo, A. Forbes

引用次数: 2

Thermal management of quantum cascade lasers in an individually addressable monolithic array architecture 单个可寻址单片阵列架构中量子级联激光器的热管理

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2208923

L. Missaggia, Christine A. Wang, M. Connors, B. Saar, A. Sanchez-Rubio, K. Creedon, G. Turner, W. Herzog

{"title":"Thermal management of quantum cascade lasers in an individually addressable monolithic array architecture","authors":"L. Missaggia, Christine A. Wang, M. Connors, B. Saar, A. Sanchez-Rubio, K. Creedon, G. Turner, W. Herzog","doi":"10.1117/12.2208923","DOIUrl":"https://doi.org/10.1117/12.2208923","url":null,"abstract":"There are a number of military and commercial applications for high-power laser systems in the mid-to-long-infrared wavelength range. By virtue of their demonstrated watt-level performance and wavelength diversity, quantum cascade laser (QCL) and amplifier devices are an excellent choice of emitter for those applications. To realize the power levels of interest, beam combining of arrays of these emitters is required and as a result, array technology must be developed. With this in mind, packaging and thermal management strategies were developed to facilitate the demonstration of a monolithic QCL array operating under CW conditions. Thermal models were constructed and simulations performed to determine the effect of parameters such as array-element ridge width and pitch on gain region temperature rise. The results of the simulations were considered in determining an appropriate QCL array configuration. State-of-the-art micro-impingement cooling along with an electrical distribution scheme comprised of AlN multi-layer technology were integrated into the design. The design of the module allows for individual electrical addressability of the array elements, a method of phase control demonstrated previously for coherent beam combining of diode arrays, along with access to both front and rear facets. Hence, both laser and single-pass amplifier arrays can be accommodated. A module was realized containing a 5 mm cavity length monolithic QCL array comprised of 7 elements on 450 m pitch. An output power of 3.16 W was demonstrated under CW conditions at an emission wavelength of 9μm.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"15 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":"134375668","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: 9

980nm diode laser pump modules operating at high temperature 在高温下工作的980nm二极管激光泵浦模块

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2214427

Jenna Campbell, T. Semenic, P. Leisher, A. Bhunia, M. Mashanovitch, D. Renner

{"title":"980nm diode laser pump modules operating at high temperature","authors":"Jenna Campbell, T. Semenic, P. Leisher, A. Bhunia, M. Mashanovitch, D. Renner","doi":"10.1117/12.2214427","DOIUrl":"https://doi.org/10.1117/12.2214427","url":null,"abstract":"Existing thermal management technologies for diode laser pumps place a significant load on the size, weight and power consumption of High Power Solid State and Fiber Laser systems, thus making current laser systems very large, heavy, and inefficient in many important practical applications. This problem is being addressed by the team formed by Freedom Photonics and Teledyne Scientific through the development of novel high power laser chip array architectures that can operate with high efficiency when cooled with coolants at temperatures higher than 50 degrees Celsius and also the development of an advanced thermal management system for efficient heat extraction from the laser chip array. This paper will present experimental results for the optical, electrical and thermal characteristics of 980 nm diode laser pump modules operating effectively with liquid coolant at temperatures above 50 degrees Celsius, showing a very small change in performance as the operating temperature increases from 20 to 50 degrees Celsius. These pump modules can achieve output power of many Watts per array lasing element with an operating Wall-Plug-Efficiency (WPE) of >55% at elevated coolant temperatures. The paper will also discuss the technical approach that has enabled this high level of pump module performance and opportunities for further improvement.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"13 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":"132469654","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: 5

Whispering-gallery mode resonator sensors based on liquid droplets 基于液滴的低语通道模式谐振器传感器

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2230623

R. Zullo, A. Giorgini, S. Avino, P. Malara, P. De Natale, G. Gagliardi

引用次数: 1

Advanced centering of mounted optics

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2213125

C. Wenzel, Ralf Winkelmann, R. Klar, Peter Philippen, Ron P. Garden, S.M. Pearlman, Guy Pearlman

{"title":"Advanced centering of mounted optics","authors":"C. Wenzel, Ralf Winkelmann, R. Klar, Peter Philippen, Ron P. Garden, S.M. Pearlman, Guy Pearlman","doi":"10.1117/12.2213125","DOIUrl":"https://doi.org/10.1117/12.2213125","url":null,"abstract":"Camera objectives or laser focusing units consist of complex lens systems with multiple lenses. The optical performance of such complex lens systems is dependent on the correct positioning of lenses in the system. Deviations in location or angle within the system directly affect the achievable image quality. To optimize the achievable performance of lens systems, these errors can be corrected by machining the mount of the lens with respect to the optical axis. The Innolite GmbH and Opto Alignment Technology have developed a novel machine for such center turning operation. A confocal laser reflection measurement sensor determines the absolute position of the optical axis with reference to the spindle axis. As a strong advantage compared to autocollimator measurements the utilized Opto Alignment sensor is capable of performing centration and tilt measurements without changing objectives on any radius surface from 2 mm to infinity and lens diameters from 0.5 mm to 300 mm, including cylinder, aspheric, and parabolic surfaces. In addition, it performs significantly better on coated lenses. The optical axis is skewed and offset in reference to the spindle axis as determined by the measurement. Using the information about the mount and all reference surfaces, a machine program for an untrue turning process is calculated from this data in a fully automated manner. Since the optical axis is not collinear with the spindle axis, the diamond tool compensates for these linear and tilt deviations with small correction movements. This results in a simple machine setup where the control system works as an electronic alignment chuck. Remaining eccentricity of <1 μm and angular errors of < 10 sec are typical alignment results.","PeriodicalId":314691,"journal":{"name":"SPIE LASE","volume":"32 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":"125246115","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: 5

Discrete excitation of mode pulses using a diode-pumped solid-state digital laser 用二极管泵浦固态数字激光器进行模式脉冲的离散激励

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2214567

S. Ngcobo, Teboho Bell

引用次数: 0

The finite-difference matrix for beam propagation: eigenvalues and eigenvectors 光束传播的有限差分矩阵:特征值和特征向量

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2214399

A. Paxton

引用次数: 0

Polarization and wavelength insensitive optical feedback control systems for stabilizing CO2 lasers 用于稳定CO2激光器的偏振和波长不敏感光反馈控制系统

SPIE LASE Pub Date : 2016-04-22 DOI: 10.1117/12.2211804

M. Jebali