基于偏振干涉的任意波长锁定器

A polarization interference-based wavelength locker with uniform resolution

设计一种可任意设定波长且具有低温度漂移特性的波长锁定器。利用YVO4和LiNbO3等材料的热光特性及引入温度反馈补偿系统方式，实现锁定器的较低温度漂移特性；通过引入两个位相差为π／2的晶体偏振干涉滤波器，使得锁定器能够在工作波长范围内任意位置的实现波长锁定，且具有近似一致的分辨率。实验结果表明，设计的波长锁定器对于固定波长（1543nm），在10～40℃的温度范围内工作时，波长锁定频率误差小于0．4GHz；当输入波长在波长锁定器的单个自由光谱范围内变化时，相同的温度范围下，最大频率锁定误差不大于0．8GHz。

A thermalized wavelength locker with uniform resolution is proposed. Material thermal compensation and temperature sensor are combined to improve temperature stability of wave- length locker. Dual birefringent filters with the phase difference of π/2 are used to obtain such u- niform frequency resolution that the locker could lock at any wavelength in the operating range. Experimental results show that the wavelength error is 0.2GHz in the temperature range of 10~ 40℃ when the locker operates at the wavelength of 1543nm. When the input wavelength tuned in the free spectrum range （FSR）, the maximum locking error is less than 0.8GHz at the same tem- perature range.