Compact nonlinear frequency conversion of a Y-branch distributed Bragg reflector (DBR) diode laser for alternating dual-wavelength laser emission at 532 nm is presented for the very first time. The developed light source, realized on a 5 × 25 mm 2 micro-optical bench, is based on single-pass second harmonic generation of a 1064 nm Y-branch DBR diode laser in a periodically poled lithium niobate waveguide crystal with superimposed poling periods. Phase-matching is obtained by intrinsic wavelength stabilization of the laser and wavelength tuning by implemented heater elements above the DBR gratings. Obtained optical output powers of 5.6 mW at 532.45 nm and 6.7 mW at 531.85 nm are limited by central lobe power contents of 52% available for waveguide coupling. With a spectral performance showing narrowband emission with spectral widths of 0.01 nm (0.4 cm −1 ) limited by the spectral resolution of the spectrum analyzer and a spectral spacing of 0.6 nm (20 cm −1 ), the developed light source is suitable for applications such as Raman spectroscopy and shifted excitation Raman difference spectroscopy (SERDS). Separate electrical contacts of the Y-branch diode laser enable alternating operation at both wavelengths.

中文翻译：

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基于紧凑型二极管激光器的光源，在 532 nm 处具有交替双波长发射

首次提出了用于 532 nm 交替双波长激光发射的 Y 分支分布式布拉格反射器 (DBR) 二极管激光器的紧凑型非线性频率转换。开发的光源在 5 × 25 mm 2 微型光学平台上实现，基于 1064 nm Y 分支 DBR 二极管激光器在具有叠加极化周期的周期性极化铌酸锂波导晶体中的单通二次谐波产生。相位匹配是通过激光器的固有波长稳定性和通过在 DBR 光栅上方实施的加热器元件进行波长调谐来获得的。在 532.45 nm 处获得的光输出功率为 5.6 mW，在 531.85 nm 处获得的光输出功率为 6.7 mW，受到可用于波导耦合的 52% 的中心瓣功率含量的限制。光谱性能显示窄带发射，光谱宽度为 0.01 nm (0. 4 cm -1 ) 受限于光谱分析仪的光谱分辨率和 0.6 nm (20 cm -1 ) 的光谱间距，开发的光源适用于诸如拉曼光谱和位移激发拉曼差分光谱 (SERDS) 等应用。Y 分支二极管激光器的独立电触点可在两种波长下交替工作。