摘要
提出了一种利用特殊多层反射膜—应力双反射膜制作的偏振双反射膜He Ne双频激光器 ,这种膜对不同偏振光在垂直入射时反射系数相位跃变不同。利用横向Zeeman效应减小模式耦合 ,使激光器能够输出 5MHz频差的正交线偏振光。进行了横向磁场的方向及激光器的偏振特性的实验研究。采用热补偿法稳频后 ,与中国计量科学研究院的碘稳频激光器 (波长扩展不确定度为 2 5× 10 - 1 1 )进行了拍频比对 ,比对结果表明 :激光器的频率稳定度为 1 4× 10 - 1 0 (10s采样 ) ,平均真空波长扩展不确定度为 3× 10 - 8(K =3)。这种双频激光器结构简单 ,光束特性好 ,频差合适 ,适于制作高测速外差干涉仪。
A 5MHz beat frequency He Ne laser equipped with bireflectance (double reflection) cavity mirror is described. It is realized on the principle that the reflecting phase jumps are different along the fast and slow axis when the incident light is oriented in a direction perpendicularly to the bireflectance cavity mirror. After transverse Zeeman effect for reducing the mode coupling, the laser could produce two orthogonal linear polarization components with 5MHz beat frequency. The direction of the magnetic field and the polarization property of the laser were tested. After frequency stabilized, the laser is calibrated with the iodine frequency stabilization laser (the wavelength uncertainty is 2.5×10 -11 ) of the National Institute of Metrology (NIM) of China, the results show that the frequency stabilization is 1.4×10 -10 (sampled in 10 s), the wavelength uncertainty is 3×10 -8 . The laser has such merits as simple form, favorable orthogonal property and appropriate beat frequency. Such dual frequency laser is very suitable for high speed heterodyne interferometer.
出处
《计量学报》
CSCD
北大核心
2002年第4期241-244,共4页
Acta Metrologica Sinica
基金
国家自然科学基金 (No.5 973 5 12 0 )
