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外腔反馈的激光二极管阵列(LDA)可获得窄线宽、可调谐的光谱输出。外腔由快轴准直镜、准直光学系统和闪耀光栅组成。由于阵列中各发光单元的排列弯曲导致不同波长的光原路返回,引起谱线展宽,在输出光路中加入光谱滤波器,使激光二极管阵列的线宽进一步窄化。这样,激光二极管阵列的输出光谱由自由运转时的2 nm压缩到0.12 nm,在恒定温度23℃时,实现了激光在806～818 nm的调谐,调谐范围达12 nm。
A laser diode array (LDA) with external cavity feedback provides narrow linewidth and tunable spectral output. The outer cavity consists of a fast axis collimator, collimating optics and a blazed grating. Due to the arrangement of the light-emitting units in the array, the return of the light with different wavelengths is caused by the bending of the light-emitting units, causing the spectrum broadening. By adding the spectral filter in the output light path, the line width of the laser diode array is further narrowed. In this way, the output spectrum of the laser diode array is compressed from 2 nm to 0.12 nm at a freewheeling operation. At a constant temperature of 23 ° C., the laser is tuned at 806-818 nm and the tuning range is up to 12 nm.