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介绍了一种减少半导体激光器阵列光谱组束(SBC)整体光程的方法,即将传统SBC中传输透镜的汇聚和准直作用分离,分别由两个透镜实现。起汇聚作用的透镜将各个发光单元的光束聚焦到光栅上,实现各个发光单元空间上的叠加;起准直作用的透镜在光栅之后将组合后的光束进行准直,使各个发光单元锁定在不同的波长上。由于起汇聚作用的透镜不需要再对各个发光单元的光束进行准直,汇聚透镜与巴条前端面的距离不再需要严格的等于传输透镜的焦距,二者之间的距离可以很近,因此整体的光程可以近似地减少1/2,使利用长焦传输透镜压窄线宽时各发光单元有足够的反馈量,抑制串扰,有利于实现多个巴条的SBC。采用标准的半导体激光阵列,实现连续输出激光功率为49.42 W,电光转换效率为42.7%,光谱线宽为8.5nm,输出光束水平方向光束质量M2x=1.29(0.4 mm×mrad),竖直方向光束质量M2=11.6(3.6 mm×mrad),两个方向的光束质量都与单个发光单元的光束质量接近。
A method of reducing the overall optical path length of a semiconductor laser array spectral bundle (SBC) is introduced. The separation and collimation of the transmission lens in the traditional SBC are separated by two lenses respectively. The convergent lens focuses the light beams of the respective light emitting units onto the grating to achieve spatial superposition of the light emitting units. The collimating lens collimates the combined light beams after the grating to lock the light emitting units in different On the wavelength. Since the converging lens does not need to collimate the light beam of each light emitting unit, the distance between the convergent lens and the front end surface of the bar no longer needs to be strictly equal to the focal length of the transmitting lens, so the distance between the two can be very close The overall optical path can be reduced by approximately 1/2, so that when using the telephoto lens to narrow the line width, each light-emitting unit has sufficient feedback to suppress crosstalk and is beneficial to realizing SBCs with multiple bars. The standard semiconductor laser array achieves a continuous output laser power of 49.42 W, an electro-optical conversion efficiency of 42.7% and a spectral linewidth of 8.5 nm. The output beam has a horizontal beam quality of M2x = 1.29 (0.4 mm × mrad), a vertical beam The mass M2 = 11.6 (3.6 mm × mrad), the beam quality in both directions is close to the beam quality of a single light-emitting cell.