采用多波长光束组合改善二极管激光阵列的光束质量
Improving beam quality of diode laser array by wavelength beam combining
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摘要: 基于多波长光束组合技术，利用光栅的衍射和外腔的反馈，将二极管阵列的发光单元锁定在不同的波长上，相邻单元的出射光波长有微小的差异。从外腔耦合镜输出近似平行的光束，其光束质量等同于单个发光单元的光束质量,而组合光束亮度随着组合光束个数定标放大。实验中采用发光单元宽度为100 μm、填充因子为0.5、由49个单元构成的1 cm 阵列获得功率为2.39 W的输出光束，其光谱宽度为27 nm，远场光斑的直径为0.08 mm，对应的远场发散角为1.2 mrad，其光束质量因子约为28，与单个发光单元的光束质量相当。Abstract: Based on the technology of wavelength beam combining, this paper applies the diffraction of the grating and the feedback of the external cavity to demonstrate all elements of the diode laser array(LDA) locked in different wavelength, the neighboring emitters having little difference in output wavelength. The output beam from the external cavity coupler mirror is nearly parallel, the combined beam has the same beam quality as the beam of single element of the LDA, but the brightness of the combined beam grows with the number of the LDA element. The 1 cm linear array was used in the experiment, consisting of 49 wide-aperture diodes with a diode width of 100 μm and a fill factor of 0.5. The combined beam power is 2.39 W, the wavelength spread is about 27 nm, the diameter of a circle spot is
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