Diode-laser frequency stabilization by two-frequency Doppler-broadened absorption spectroscopy.
We demonstrate a robust method for frequency stabilization of a diode laser by two Doppler-broadened absorption spectra of the cesium D2 line. This technique employs an acousto-optical modulator to generate another frequency component from a diode laser to perform the spectroscopy. The 852-nm diode laser with frequency stabilization at the zero crossing of the error signal showed a peak-to-peak fluctuation of 800 kHz compared with a frequency-stabilized femtosecond laser over a 2-h period. This frequency-locking method is free of modulation and can be applied to frequency discriminators as well as to atomic resonances.
Peng
Jin-Long
JL
Center for Measurement Standards, Building 16, 321 Kuang Fu Road, Section 2, Hsinchu, Taiwan 30042, China. jlpeng@itri.org.tw
Ahn
Hyeyoung
H