260 W波长锁定光纤耦合输出泵浦模块实验研究

半导体光纤耦合输出泵浦源是光纤激光器的核心器件，其性能直接制约光纤激光器的输出水平。采用COS封装的高功率LD芯片，通过VBG外腔光谱锁定和精密光束整形变换技术，结合偏振合束与精密聚焦耦合技术将18个LD单元耦合进105 μm/NA0.22光纤，获得不低于260 W功率输出。实验表明，该模块在注入电流18 A时，可获得稳定输出连续功率264 W，对应电光效率52%，输出光谱中心波长975.92 nm，谱宽0.51 nm。该设计为获得高功率、高亮度波长稳定泵浦源提供了一条可行途径，光纤耦合输出模块工程化后可广泛应用在光纤激光器泵浦等领域。

Experimentation of 260 W wavelength stabilized fiber-coupled diode laser pumping model

As pump station, fiber-coupled diode laser source is one of the key elements of fiber laser, its performance restricts the output level of the fiber laser directly. Aimed at a multi-mode fiber of 105 μm core diameter and 0.22 numerical aperture, a 260 W-level high-brightness fiber-coupled diode laser model based on single-emitter-COS (chip on submount) is developed. In the design, volume Bragg grating (VBG) is used to control the spectrum of the corresponding emitter at a narrow bandwidth (about 0.5 nm), and the beam shaping technologies, polarization multiplexing and aspherical lens are taken to couple the 18 LD beams into the multi-mode fiber. The experiment indicates that, the beam shaping system can couple the 18 LD beams into the fiber, and the output power can achieve 264 W, with the E-O efficiency of 52% at operation current 18 A. Simultaneously, the central wavelength of the model is locked at 975.92 nm with an FWHM of 0.51 nm. This design offers a feasible approach to the spectral-controlled fiber-coupled diode laser. The engineered fiber-coupled diode laser system can be widely used in fiber pumping and many other areas.