Modulation resonance in a laser

V. R. Nagibarov, В. В. Самарцев, Z. M. Kaveeva +2 more

L. Aubrecht

Stephen H. Chakmakjian, Karl W. Koch, Carlos R. Stroud

A series of resonances has been observed in the absorption of a 100% amplitude-modulated laser beam by an optically pumped sodium atomic beam. Resonances were observed when the modulation frequency was equal to the first, second, and third subharmonic of the Rabi frequency. The experimental results are compared with theory, and the implications of these parametric resonances to laser instabilities are discussed.

Guoqing Yang Guoqing Yang, Yunfei Xu, Qiang Lin +1 more

We experimentally demonstrate a simple modulation-free scheme for offset locking the frequency of a laser using buffer gas-induced resonance. Our scheme excludes the limitation of low diffraction efficiency and laser input intensity when an acousto-optic modulator is applied to shift the laser frequency from the resonance. We show the stabilization of a strong 795 - nm laser detuned up to 550 MHz from the 87Rb 5S1/2F=2→5P1/2 F'=2 transition. The locking range can be modified by controlling the buffer gas pressure. A laser line width of 2 MHz is achieved over 10 min. © 2013 Chinese Optics Letters.

R. N. Shakhmuratov

S.P. Tewari, M Kirshna Kumari

The authors have analysed the optical double resonance signal to second order in the modulation of the amplitudes of the two lasers at high intensities. Resonant modulation in the populations of the upper level of the transitions are induced at the effective Rabi frequency alpha 0 , whenever the modulation frequencies themselves or a combination of them becomes equal to O, +or- alpha 0 , +or-2 alpha 0 . It is proposed that by performing experiments similar to those done by Miyazaki et al such Rabi resonances in the populations of the levels may be detected by optogalvanic technique-i.e., by monitoring the oscillations in the current or the voltage at the sum or the difference of the modulation frequencies of the two lasers.