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钛蓝宝石晶体作为一种重要的激光介质,具有宽带的吸收光谱及宽带可调谐的发射光谱等特性,使其在集成光学中有广泛的应用前景。这里利用重复频率为1 k Hz,中心波长为800 nm,脉冲宽度为120 fs的飞秒脉冲激光在钛蓝宝石晶体中横向刻写双线型波导,系统地研究了激光写入晶体深度、刻写速度以及波导双线间距对波导导光情况的影响,在写入激光脉冲能量为2μJ,写入深度为175μm,刻写速度为90μm/s,波导双线间距为26μm的条件下,得到一组导光模式较优的双线波导并发现其具有偏振导光现象。利用波导的近场模式强度分布重构了其折射率分布图,得到最大的折射率增加量为1.9×10-4。用散射法测试了光波导的传输损耗为1.82 d B/cm。
Titanium-sapphire crystal, as an important laser medium, has the characteristics of wideband absorption spectrum and broadband tunable emission spectrum, which makes it have broad application prospects in integrated optics. Here we use a femtosecond pulsed laser with a repetition rate of 1 k Hz, a center wavelength of 800 nm and a pulse width of 120 fs to write a two-line waveguide transversely to a Ti: sapphire crystal. The laser writing crystal depth, the writing speed, and The effect of waveguide spacing on the waveguide performance was studied. Under the condition of 2μJ laser pulse power, 175μM write depth, 90μm / s writing speed and 26μm spacing between the two wires, a series of light guide modes The preferred two-wire waveguide is found to have polarized light guide. The refractive index profile of the waveguide was reconstructed using near-field mode intensity distribution of the waveguide and the maximum refractive index increase was 1.9 × 10-4. The transmission loss of the optical waveguide was measured by the scattering method to be 1.82 d B / cm.