Abstract
The axial separation distance between an intracavity resonant Raman-Nath acousto-optic modulator and the secondary mirror of an unstable resonator of a TE CO<SUB>2</SUB> laser has strong effects on the mode-locking efficiency. Experimental measurements showed that the mode-locker laser pulse width was a periodic function of the separation distance with a period of about 18 mm. Preliminary simple analyses using a two-beam interference model yield a periodic sine-squared acousto-optic diffraction intensity distribution as a function of separation distance with the mode-locked pulse width varying as the inverse of sine to the fourth power of the diffraction intensity. The observed pulse width was in good agreement with the calculated value using the above interference theory.
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