掺钬铥二氧化硅微球的2微米激光振荡

2 μm laser oscillation of Ho:Tm-codoped silica microspheres.

作者信息

Peng Longxiang, Huang Yantang, Duan Yafan, Zhuang Shijian, Liao Tingdi, Xu Canhua

出版信息

Appl Opt. 2017 Sep 10;56(26):7469-7473. doi: 10.1364/AO.56.007469.

DOI:10.1364/AO.56.007469

Abstract

2 μm laser oscillation with a low threshold has been achieved in Ho:Tm-codoped silica microspheres (HTCSMs). Ho:Tm-codoped solgel functionalization film is applied to the surface of a silica microsphere, and an optical tapered fiber is adopted to couple an 808 nm continuous-wave laser to serve as the pump light source. Multimode and single-mode laser oscillations around 2 μm within the eye-safe wave band are observed due to the I5→I5 transitions of Ho ions sensitized by Tm. The morphology characteristics of microspheres determine the multimode laser oscillation spectrum. The free spectral range is in good accordance with the calculated value based on Mie scattering theory. The HTCSM laser oscillation shows characteristics of good capability, simple process, high flexibility, and low cost.

摘要

在掺钬铥二氧化硅微球（HTCSMs）中实现了低阈值的2μm激光振荡。将掺钬铥溶胶 - 凝胶功能化薄膜应用于二氧化硅微球表面，并采用光学锥形光纤耦合808nm连续波激光作为泵浦光源。由于铥敏化的钬离子的I5→I5跃迁，在人眼安全波段内观察到了2μm左右的多模和单模激光振荡。微球的形态特征决定了多模激光振荡光谱。自由光谱范围与基于米氏散射理论计算的值高度吻合。HTCSM激光振荡具有性能良好、工艺简单、灵活性高和成本低的特点。