摘要:
设计了一种离轴双反馈外腔能够有效地改善激光二极管阵列的线宽和光束质量.闪耀光栅和高反镜之间形成了一个共振腔.通过调整光栅和高反镜之间的倾角可以选定一个空间模在共振腔中放大.将一个半波片插入外腔中的光栅反馈支路,来控制反馈光的数量,激光从光栅反馈支路输出.运用这项技术,在工作电流16 A,可以把激光二极管阵列的输出线宽压缩到0.15 nm,光束束宽积减小到283 mm·mrad.由于光栅的锁定作用,中心波长几乎不随温度的变化而改变.在工作电流17 A时,输出激光的功率为2.44 W,斜率效率为0.5 W/A.
Abstract:
An off-axis external cavity with double feedback is designed to simultaneously reduce spectral bandwidth and improve the beam quality of the laser diode bar.The external cavity is made up of a high-reflection mirror and a blazed grating,where the selected spatial mode can be amplified.The grating can also provide a spectral-sensitive feedback to the laser diode bar.In addition,a half-wave plate is inserted into the grating-feedback branch to control the feedback light amount,and the output laser is taken from the grating-feedback branch.The bandwidth and the beam parameter product are external cavity at a drive current of 16 A.The center wavelength is almost unchanged as the temperature varies,the laser output power is about 2.44 W at the driver current of 17 A and the slope efficiency is about 0.5 W/A.
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