|
Yan Juqun
Yin Chunyong
State Key Laboratory of Precision
Measurement Technology
and Instruments,
Department of Precision Instruments
and Mechanology,
Tsinghua University,
Beijing 100084, China
Jiang
Hong
Pretech Science
Technology Co., Ltd., Beijing 100084, China
|
|
|
DUAL-FREQUENCY
LASER USING
ANISOTROPIC BIREFLECTANCE
FILM (1.2~6.0 MHz) AND ITS
POLARIZATION CHARACTER*
Abstract: The appropriate bireflectance film series are selected to get the beat-frequency of dual-frequency laser using anisotropic bireflectance film (DLABF) from 1.2 MHz to 6 MHz. The maximum measurement velocity of the interferometer utilizing DLABF can be up to1.8 m/s. Generally the outputs of the DLABF in a transverse magnetic field are two orthogonal micro-elliptical polarized components when DLABF can emit dual-frequency laser. When the laser tube is spun in the magnetic field, the ellipticities of these two components are also changed. In some certain relative angles, the outputs the DLABF are two almost ideally orthogonal linear polarized components. The frequency stabilization of DLABF is also discussed. The maximum variation of the beat-frequency of the stabilized DLABF can be 0.15 kHz within 46 h. As no quarter wave plate (QWP) needed, DLABFs have better thermal stability than longitudinal Zeeman lasers.
Key words:
He-Ne laser Bireflectance film Polarization character |