Abstract
The feedback stabilization of injection-locked Two-Longitudinal-Mode-Beating (TLMB) in a TEA CO2 laser is proposed and realized. The TLMB output is to be utilized as a ponderomotive source for driven scattering plasma diagnostics. The cavity length of the TEA CO2 laser is tuned such that the frequency of the injected laser is to be located at the center between two adjacent longitudinal modes. Special provision is made to protect the feedback loop from high intensity radiation of the main laser. Power-modulated outputs with a beat-frequency of around 40 MHz are obtained with a probability of about 84 percent for fifty successive shots. The so-called plasma chirp effect is found to be negligible in the present system.
