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Doppler-effect mechanism for laser Q switching with a rotating mirror

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3 Author(s)
Kafri, O. ; Israel Institute of Technology, Haifa, Israel ; Speiser, Shammai ; Kimel, S.

A novel description, based on the Doppler effect, is given for laserQswitching by a rotating mirror. Fourier analysis yields a relation between the width of the pulseDeltat_{1/2}and the angular velocity of the mirrordot{theta}. It is shown that for laser emission having a Gaussian spatial amplitude profile the temporal shape of aQ-switched pulse is also Gaussian. It is predicted that for different lasersQswitched by mirrors rotating with the samedot{theta}, Deltat_{1/2}will depend on the wavelength of the laser. For a ruby laser, measurements are reported ofDeltat_{1/2}versusdot{theta}for different configurations of the cavity into which vertical and horizontal slits were introduced.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:7 ,  Issue: 3 )