A prism-based self-injection locked seamlessly tunable blue InGaN/GaN laser diode composite cavity system is presented. A rigorous analysis of this external cavity diode laser (ECDL) system is performed at two different optical feedback powers. At 130 mA low injection, the high reflection system (HRS) exhibits a record wideband tuning span of ∼12.11 nm with a side-mode-suppression-ratio (SMSR) ≥ 15 dB, measuring as high as 40 dB, linewidth ≤110 pm, and a working power of about 3 mW. Whereas, a tuning range of 8 nm with linewidth ≤88 pm, SMSR ≥ 13 dB, reaching a maximum of 35 dB with 14.5 mW usable power is achieved from the low reflection system (LRS) at the same injection current. Moreover, an inverse relationship between the optical power and the tunability is observed in both the systems with a value as high as 180 mW exhibited by LRS configuration and attaining a tunability of 4.5 nm. Both systems highlight high stability even at higher injection currents and temperature. Such a robust, simple, and compact system may serve as a crucial light source in a plethora of diverse applications besides visible optical communications. To the best of our knowledge, this is the first report on a continuously tunable self-injection locked tunable laser system.

中文翻译：

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具有增强波长调谐范围的蓝色激光二极管系统

提出了一种基于棱镜的自注入锁定无缝可调蓝色 InGaN/GaN 激光二极管复合腔系统。该外腔二极管激光器 (ECDL) 系统的严格分析是在两种不同的光反馈功率下进行的。在 130 mA 低注入时，高反射系统 (HRS) 表现出创纪录的~12.11 nm 宽带调谐跨度，边模抑制比 (SMSR) ≥ 15 dB，测量值高达 40 dB，线宽 ≤ 110 pm ，工作功率约为 3 mW。而在相同注入电流下，低反射系统 (LRS) 可实现 8 nm 的调谐范围，线宽 ≤ 88 pm，SMSR ≥ 13 dB，在 14.5 mW 可用功率下达到最大 35 dB。而且，在两个系统中都观察到光功率和可调谐性之间的反比关系，LRS 配置显示的值高达 180 mW，可调谐性达到 4.5 nm。即使在更高的注入电流和温度下，这两个系统都具有高稳定性。除了可见光通信之外，这种坚固、简单且紧凑的系统可以作为众多不同应用中的关键光源。据我们所知，这是关于连续可调自注入锁定可调激光系统的第一份报告。