R. Gamidov et al., UNMODULATED EXTERNAL-CAVITY DIODE-LASER STABILIZED ON CESIUM D-2 LINE, IEE proceedings. Science, measurement and technology, 143(4), 1996, pp. 263-264
Frequencies of two external-cavity diode lasers were locked to Doppler
-free resonances on the caesium D-2 line using the Zeeman modulation t
echnique. In this technique the laser frequency is unmodulated. The Al
lan variance of beat note between two identical lasers was measured, F
requency stabilities of better than 10(-12) were observed for averagin
g times from 10 to 300s.