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利用二氧化钒(VO_2)的饱和吸收性质,通过消逝场吸收的方式对波导激光进行调节,实现了皮秒脉冲激光输出;通过控制VO_2的温度可对输出激光的脉冲宽度、重复频率和能量等进行调控。在VO_2薄膜从绝缘相过渡到金属相期间,通过测量复合光波导(掺杂钇铝石榴石波导表面附着VO_2)的激光输出,可直接观察到VO_2的可饱和吸收性质。VO_2薄膜与波导模式这两者之间通过消逝场相互作用,使得VO_2对光的吸收显著增加。受益于VO_2独特的热驱动光学性质,在1064nm处,波导激光在皮秒脉冲和连续波机制间可有效切换。由于VO_2薄膜可饱和吸收的热滞特征,通过冷却或加热处理,在相同的温度条件下,复合波导可产生连续激光和皮秒脉冲激光。这项研究为在芯片级平台上实现热控制有源集成光源提供了一种方法。
By using the vanadium dioxide (VO2) saturation absorption property, the waveguide laser can be adjusted by evanescent field absorption to realize the picosecond pulse laser output. By controlling the temperature of VO_2, the pulse width, repetition frequency and energy of the output laser can be controlled Regulate. During the transition of the VO_2 thin film from the insulating phase to the metallic phase, the saturable absorption properties of VO_2 can be directly observed by measuring the laser output of the composite optical waveguide (VO_2 attached to the yttrium aluminum garnet waveguide surface). VO_2 film and waveguide mode pass the evanescent field interaction between the two, making the VO2 absorption of light increased significantly. Benefiting from the unique thermal-driven optical properties of VO_2, the waveguide laser is effectively switched between the picosecond pulse and the continuous-wave mechanism at 1064 nm. Due to the thermal hysteresis characteristic of VO_2 film saturated absorption, the composite waveguide can generate continuous laser and picosecond pulsed laser at the same temperature by cooling or heat treatment. This research provides a method for thermally controlling an active integrated light source on a chip-scale platform.