论文部分内容阅读
研究了使用钛宝石放大器输出的重复频率为50kHz、中心波长为775nm、脉冲宽度为160fs的超快激光在掺镱钇铝石榴石(Yb…YAG)中刻写双线型光波导的过程。发现了波导具有偏振导光现象,偏振态平行于双线方向的激光可以导通,偏振态垂直于双线方向的激光不能导通。详细分析了双线间距、刻写速度和激光脉冲能量对波导形成的影响,在双线间距为30μm、刻写速度为400μm/s、脉冲能量为5.0μJ的条件下写入的光波导导光特性良好。利用近场模重建了该波导折射率二维分布,波导区域折射率相对于基质改变量的最大值为1.8×10-4,且该波导在940nm半导体激光抽运激励下,获得了1030.5nm的连续激光输出,激光功率为4.7mW。
The process of writing birefringent waveguides in ytterbium-doped yttrium aluminum garnet (Yb ... YAG) using an ultrafast laser output at a repetition rate of 50 kHz, a center wavelength of 775 nm and a pulse width of 160 fs using a Ti: GaAs amplifier was investigated. Waveguide was found to have polarized light guide. The laser with polarization parallel to the two-line direction could be turned on, and the laser with polarization perpendicular to the two-line direction could not be turned on. The effects of the two-wire pitch, the writing speed and the laser pulse energy on the waveguide formation are analyzed in detail. The optical waveguide characteristics of the optical waveguide written at the two-wire pitch of 30μm, the writing speed of 400μm / s and the pulse energy of 5.0μJ are good . The refractive index two-dimensional distribution of the waveguide was reconstructed by near-field mode. The maximum value of the refractive index of the waveguide with respect to the matrix change was 1.8 × 10-4. Under the excitation of 940nm semiconductor laser, the waveguide had a 1030.5nm Continuous laser output, laser power is 4.7mW.