二极管激光光谱合束技术实验研究

Experimental research of spectrally beam combined diode laser based on grating-cavity

为了研究基于光栅-外腔的二极管激光阵列光谱合束,利用存在离轴像差情况下耦合效率模型,数值模拟了系统各参量对耦合效率的影响,可知耦合效率随着离轴距离和横模阶次增加而下降;单个单元将被压窄至0.05nm。应用光栅-外腔实现了单条二极管激光阵列光谱合束,获得了10.1W的连续输出,斜效率为0.45W/A,慢轴方向光束质量因子M_x^2=17.6,整个阵列的光谱被展宽到15nm,单个单元的线宽被压窄到0.1nm。结果表明,光谱合束能改善二极管激光阵列的光束质量,压窄单个单元的线宽。

In order to study spectral beam combining of a laser diode array （ LDA ） based on grating-cavity, coupling efficiency model with abaxial aberration was adopted to analyze the effect of the system parameters on the coupling efficiency. The coupling efficiency decreased when abaxial distance or the order of mode increased, and the linewidth of emitters could be compressed to 0.05nm. A LDA comprised of 19 emitters was spectrally combined by means of grating-cavity with 10. IW CW output power,0.45W/A slope efficiency and beam quality factor Mx2 of 17.6 along the slow axis. Spectrum width of the LDA was broaden to 15nm, and linewidth of a single emitter was compressed to 0. lnm. It is shown that spectral beam combining can improve beam quality of a LDA and narrow linewidth of emitters.