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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 laser Q switching by a rotating mirror. Fourier analysis yields a relation between the width of the pulse \Delta t_{1/2} and the angular velocity of the mirror \dot{\theta} . It is shown that for laser emission having a Gaussian spatial amplitude profile the temporal shape of a Q -switched pulse is also Gaussian. It is predicted that for different lasers Q switched by mirrors rotating with the same \dot{\theta}, \Delta t_{1/2} will depend on the wavelength of the laser. For a ruby laser, measurements are reported of \Delta t_{1/2} versus \dot{\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 )