Thermal Lens Manipulation Using Edge-Heaters in Laser Bars for Improved Efficiency and Divergence

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-04-17 DOI:10.1109/LPT.2025.3558758

Md. Jarez Miah;Anisuzzaman Boni;Dominik Martin;Arnim Ginolas;Mohamed Elattar;Pietro Della Casa;Stefan Grützner;Stephan Strohmaier;Andrea Knigge;Günther Tränkle;Paul Crump

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引用次数: 0

Abstract

We present here an approach to flattening the lateral thermal lens that develops in kW-class semiconductor laser bars consisting of multiple broad-area emitters and is responsible for limiting the power, conversion efficiency and beam quality of the bars. Simulation results show that by increasing heat at the edge-emitters of the bars, thermal lens can be diminished. With an experiment on single-emitters, we demonstrated that the required heat in the edge-emitters can be achieved by shortening their pump length. Following these studies, we fabricated 1-cm wide bars containing 37 emitters, each with a 186-

$\mu $

m-wide stripe and a 4-mm-long resonator. In contrast to the baseline bars with equally and fully pumped emitters, the best-designed bars with an optimum (shorter) pump length only in the edge-emitters yield a 5%-points higher conversion efficiency, and an improved beam quality, narrowing the lateral beam divergence at 95% power content by over 10% at 0.8 kW power.

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热透镜操作使用边缘加热器的激光棒，以提高效率和发散

我们在这里提出了一种扁平化侧向热透镜的方法，这种侧向热透镜是由多个广域发射器组成的kw级半导体激光棒中发展起来的，它负责限制棒的功率，转换效率和光束质量。仿真结果表明，通过增加棒的边缘发射器处的热量，可以减小热透镜。通过对单发射器的实验，我们证明了通过缩短泵浦长度可以达到边缘发射器所需的热量。在这些研究之后，我们制作了1厘米宽的条，包含37个发射器，每个发射器具有186- $ $ μ $ m宽的条纹和一个4毫米长的谐振器。与具有相同泵浦和完全泵浦发射器的基准棒相比，仅在边缘发射器中具有最佳（较短）泵浦长度的最佳设计棒的转换效率提高了5%，并且改善了光束质量，在0.8 kW功率下，将95%功率含量下的侧向光束发散缩小了10%以上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.