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- Title
Frequency stabilization of a diode laser on the Cs D[sub 2] resonance line by the Zeeman effect in a vapor cell.
- Authors
Beverini, N.; Maccioni, E.; Marsili, P.; Ruffini, A.; Sorrentino, F.
- Abstract
Hyperfine optical pumping of a Cs-vapor cell through a diode laser in frequency standards requires a high purity of the laser emission spectrum, and a high stability of the emission frequency. We present here a frequency-locking scheme that is able to produce a discrimination signal without any modulation, by using the dichroism induced by a magnetic field on the atomic vapor. The larger line-width of the reference signal (Doppler-broadened) is compensated by its larger amplitude, when compared with the saturated absorption signal. As a final result, the slope is similar, and the large line-width warrants a large locking range, making robust the lock against external perturbations. This error signal is used to lock the frequency of an external cavity diode laser, with a grating reflector in Littman configuration. A fast correction band is obtained by changing the cavity length through an intra-cavity electro-optic modulator. The possible sources of instabilities of the locking point are discussed and estimated through a simulation computer program.
- Subjects
OPTICAL pumping; CESIUM; DIODES; FREQUENCY standards; DICHROISM
- Publication
Applied Physics B: Lasers & Optics, 2001, Vol 73, Issue 2, p133
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s003400100618