光纤微透镜侧面镀膜方法和应用的研究

Study on Side Coating Method Using Micro Lens Optical Fiber and Its Application

研究了采用光纤微透镜作为半导体激光器光斑快轴压缩透镜的方法。通过在光纤的两个对称侧弧面镀制增透膜,减少了光纤微透镜对光的反射,其反射率由原来的4%降低到0.3%以下,有效的避免了形成激光器的腔外腔,进而消除了因半导体激光器快轴压缩造成波长谱线侧峰的形成。研究结果表明,在光纤透镜的部分弧面镀膜是可行的,弧面镀膜部分可以减少对半导体激光器发光的反射,达到增透的目的,非常有利用于半导体激光器的输出光斑整形。

A compression method of the fast axis of semiconductor laser by micro lens using optical fiber is introduced. By coating the two symmetrical sides of the fiber with antireflection films,the light reflection of the micro lens using optical fiber is reduced from original 4% to less than 0. 3%,which effectively avoids the formation of external cavity. This method eliminates the formation of the side peak in the wavelength spectrum caused by the compression of the fast axis,which is beneficial to the application of the low-cost civil lasers.