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实现了用微型风扇冷却的方法替代常见的加热方式完成对He-Ne内腔激光器的频率稳定.研究了微型风扇驱动电压与转速的响应特性和内腔式He-Ne激光器的热膨胀特性.采用风冷方式对激光器的腔长进行调节和控制,并通过双纵模功率平衡原理完成了激光频率的稳定.稳定后的激光器管壁平均温度低于50℃.与高精度碘稳定激光的拍频实验结果表明,其频率在20h内的波动范围小于1.4MHz(τ=1s),4个月内激光频率的相对标准不确定度为U=4.7×109.
The frequency stabilization of the He-Ne cavity laser is achieved by using the micro-fan cooling instead of the common heating method.The response characteristics of the micro-fan driving voltage and rotation speed and the thermal expansion characteristics of the cavity He-Ne laser are studied. Cold way to adjust and control the length of the laser cavity and achieve the laser frequency stability by the principle of double longitudinal mode power balance.The average temperature of the stabilized laser tube wall is lower than 50 ° C. The beat frequency experiment with the high precision iodine stable laser The results show that the fluctuation range of the frequency within 20h is less than 1.4MHz (τ = 1s). The relative standard uncertainty of the laser frequency within 4 months is U = 4.7 × 109.