Chinese Journal of Lasers, Volume. 33, Issue 3, 316(2006)
Modulation-Free Frequency Stabilization of a Laser Based on a Confocal Fabry-Perot Cavity
Locking laser to a proper reference frequency can obviously improve the laser′s frequency stability.The optical path and frequencies are different for axial and paraxial beams traveling through a confocal Fabry-Perot (CFP) cavity, thus the frequency difference between them which is a dispersion-like signal can be used to stabilize the laser frequency. Thus the phase-sensitive detection via lock-in and frequency dither on the laser or cavity are no longer required. With this modulation-free stabilization method, a homemade 852 nm grating-external-cavity diode laser is stabilized to a CFP cavity frequency, whose frequency jitter is less than ±340 kHz in 30 seconds estimated from locked error signal. The long-term frequency stability was greatly improved compared with the frequency fluctuation of about 10 MHz under free-running condition in the same time scale. Moreover, the frequency shift and the zero-crossing slope of the dispersion-like frequency-discriminating signal can be conveniently changed by adjusting the angle between the two incident beams. The laser frequency stability locking with different frequency interval is investigated.
Get Citation
Copy Citation Text
[in Chinese], [in Chinese], [in Chinese], [in Chinese]. Modulation-Free Frequency Stabilization of a Laser Based on a Confocal Fabry-Perot Cavity[J]. Chinese Journal of Lasers, 2006, 33(3): 316