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利用重复频率为1 k Hz,中心波长为800 nm,脉冲宽度为120 fs的超短脉冲激光在掺Er3+“无水”氟碲酸盐玻璃中利用狭缝整形技术横向刻写了I类和压低圆包层波导。在对波导刻写参数进行系统研究后,得到了两组导光模式较优的波导。利用波导的近场模式强度分布重构了其折射率分布图,得到两类波导最大的折射率增加量分别为1×10-4和1.9×10-4。用散射法测试了I类波导的传输损耗为1.04 d B/cm;通过测量插入损耗得到压低圆包层波导的传输损耗小于1.88 d B/cm。因此,利用飞秒激光在掺Er3+“无水”氟碲酸盐玻璃中刻写的光波导,在集成激光光源制作方面具有很好的应用前景。
Using the short pulse laser with a repetition rate of 1 k Hz, a center wavelength of 800 nm and a pulse width of 120 fs, slit-shaping techniques were used to characterize type I and type I in a doped Er3 + / waterless “ Lowered round-clad waveguide. After conducting a systematic study of the inscribed parameters of the waveguide, two sets of waveguides with better light guide modes were obtained. Using the waveguide near-field mode intensity distribution to reconstruct the refractive index profile, the maximum refractive index increase of the two types of waveguides are 1 × 10-4 and 1.9 × 10-4 respectively. The transmission loss of the I-type waveguide was 1.04 d B / cm measured by the scattering method. The transmission loss of the depressed-clad waveguide was less than 1.88 d B / cm by measuring the insertion loss. Therefore, optical waveguides that are written in Er3 + doped ”anhydrous " fluoride tellurite glass using femtosecond laser light have good application prospects in the fabrication of integrated laser light sources.