Emitter-Resolved Characterization of High-Power Diode Laser Bars at Operating Point and Below Threshold

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

IEEE Photonics Technology Letters Pub Date : 2025-06-16 DOI:10.1109/LPT.2025.3579859

Bastian Dommermuth;Ulrich Witte;Anne Balck;Michael Bay

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Abstract

In this letter, we report on a novel measurement setup for emitter resolved characterization of polarization, optical output power, wavelength, and slow-axis intensity distribution of high-power diode laser bars. Our setup enables the emitter-resolved characterization in a range starting from below the laser threshold reaching up to several 100 amps correlating to operating power of the state-of-the-art generation of diode laser bars, which possess a power output of several 100 watts. In contrast to previous works, the properties are determined directly from the laser radiation during operation, which enables us to directly correlate the emitter-resolved power and polarization distribution. In addition to the reduction in degree of polarization towards the edge emitters, we demonstrate a disparity in power distribution among the edge emitters at operating output power in comparison to operation below the laser threshold. To distinguish between thermal and stress-induced effects, we operate the diode laser bar both in cw- and pulsed mode. Furthermore, we demonstrate how the effects of mechanical stress on the performance and degree of polarization of the edge emitters at operating power are identified.

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大功率二极管激光棒在工作点和阈值以下的发射分辨特性

在这封信中，我们报告了一种新的测量装置，用于高功率二极管激光棒的偏振、光输出功率、波长和慢轴强度分布的发射器分辨特性。我们的设置使发射器的分辨特性能够在激光阈值以下的范围内达到高达100安培（与最先进的二极管激光棒的工作功率相关），其功率输出为100瓦。与以往的工作不同，这些特性是直接由激光在工作过程中的辐射决定的，这使我们能够直接将发射器分辨功率和偏振分布联系起来。除了对边缘发射器的极化程度降低之外，我们还证明了与低于激光阈值的操作相比，在操作输出功率时边缘发射器之间的功率分布存在差异。为了区分热效应和应力效应，我们在连续波和脉冲模式下操作二极管激光棒。此外，我们还演示了在工作功率下如何识别机械应力对边缘发射器性能和极化程度的影响。

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.