This study presents a highly efficient and low-noise all-fiber single-frequency (SF) 795-nm laser system realized using a simple and robust single-pass frequency-doubling configuration. The foundation of the system is a 1590-nm erbium-doped fiber amplifier operating in a master oscillator power amplifier configuration seeded by a distributed feedback semiconductor laser at 1590.52 nm. The main amplifier exhibits an exceptional amplification efficiency of 30.5 %. By utilizing a periodically poled lithium niobate waveguide, the 795-nm laser is frequency-doubled with an output power reaching 2.3 W, corresponding to an optical efficiency of 44 % of the fundamental laser. Crucial to its application in precision measurements and quantum technologies, the SF 795-nm laser exhibits a relative intensity noise close to −150 dBc/Hz in the frequency range of 0.1 to 10 MHz. Additionally, a continuous frequency-tuning range of 11.7 GHz is achieved by modulating the current with a 2.5-mA 1-Hz triangular wave. Notably, this is the first report on an all-fiber SF 795-nm laser system.

中文翻译：

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具有连续频率调谐功能的稳健低噪声 795 nm 单频光纤激光器

本研究提出了一种高效、低噪声的全光纤单频 (SF) 795 nm 激光系统，该系统使用简单且稳健的单通倍频配置实现。该系统的基础是一个 1590 nm 掺铒光纤放大器，在主振荡器功率放大器配置中运行，由 1590.52 nm 的分布式反馈半导体激光器提供种子。主放大器具有 30.5% 的卓越放大效率。通过利用周期性极化铌酸锂波导，795 nm激光器倍频，输出功率达到2.3 W，相当于基础激光器的44%的光学效率。 SF 795 nm 激光器在 0.1 至 10 MHz 频率范围内表现出接近 -150 dBc/Hz 的相对强度噪声，这对其在精密测量和量子技术中的应用至关重要。此外，通过使用 2.5mA 1Hz 三角波调制电流，可实现 11.7GHz 的连续频率调谐范围。值得注意的是，这是第一份关于全光纤 SF 795 nm 激光系统的报告。