active cavity length的用法和样例：
- DDC112 is applied in the cavity length control system of laser gyro.
- The experiment results indicated that time coherency of the mode-locked and cw laser relates to active medium, cavity length and oscillating linewidth, basically depends on cavity cscillating linewidth.
- Cavity length depth ratio strongly influences flow field、total pressure recovery、drag coefficient.
- The results showed that the single longitudinal mode output can be obtained if the laser with adequate cavity length were coupled.
- The relation of the defocus and cavity length as well as the relation of the defocus and cavity mirrors’ distortion are obtained.