A large improvement in the frequency stability of a single-mode cw dye laser has been obtained1 by using a wide-band (0–100 kHz) servo system to lock the dye laser frequency to a transmission fringe of a high-finesse optical cavity. By applying corrections to the optical length of the dye laser cavity, the free-running laser stability of ±50 MHz (for one second averaging time) was reduced to drifts of about 1 – 2 MHz/minute (corresponding to controllable drifts of optical cavity temperature and possibly of optical coupling parameters). The frequency has been made to track these drifts in a single cavity with errors less than 50 kHz rms for short times (20 µsec) and less than 100 Hz for long times (10 sec ).
KeywordsQuartz Argon Iodine Auger Diene
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