260 W波长锁定光纤耦合输出泵浦模块实验研究

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

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105μm/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。

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 105μm 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.