Fig. 1. Schematic diagram of temperature stabilized frequency He-Ne laser feedback birefringence measurement system

Fig. 2. Physical diagram of the system

Fig. 3. Laser feedback waveform in isotropic cavity

Fig. 4. Polarization jump diagram of 1/4 wave plate

Fig. 5. Schematic diagram of polarization jump

Fig. 6. Mechanical structure of He-Ne laser temperature control system

Fig. 7. Flow chart of He-Ne laser temperature control system

Fig. 8. Temperature change diagram of He-Ne laser resonator