基于二氧化钒的热控制脉冲波导激光

发布时间：2018-05-13 00:41

本文选题：材料 + 薄膜　；参考：《中国激光》2017年07期

【摘要】：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。
[Abstract]:By using the saturated absorption property of vanadium oxide VO _ 2) and adjusting the waveguide laser by evanescent field absorption, the picosecond pulse laser output can be realized, and the pulse width of the output laser can be obtained by controlling the temperature of the VO_2. Repetition rate and energy are regulated. During the transition of VO_2 films from insulating phase to metallic phase, the laser output of composite optical waveguide (VO _ 2 doped with yttrium aluminum garnet waveguide) was measured. It can be observed directly that the saturable absorption of VO_2. The interaction between VO _ 2 thin film and waveguide mode can increase the absorption of light by VO_2 through the evanescent field. Thanks to the unique thermal drive optical properties of VO_2, waveguide lasers can be switched effectively between picosecond pulses and continuous wave mechanisms at 1064nm. Due to the thermal hysteresis characteristic of saturable absorption of VO_2 thin film, continuous laser and picosecond pulse laser can be produced under the same temperature by cooling or heat treatment. This study provides a method for the realization of thermal control active integrated light source on chip-level platform.
【作者单位】：山东大学物理学院;
【基金】：山东大学青年学者未来计划(2015WLJH20)
【分类号】：TN248

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