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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.
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 to 1.8 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 diode is spun in the magnetic field, the ellipticities of these two components are also changed. The frequency variation 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.