Abstract
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
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