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Power-efficient frequency switching of a locked laser

Power-efficient frequency switching of a locked laser
Power-efficient frequency switching of a locked laser
We demonstrate a new and efficient laser-locking technique that enables making large frequency jumps while keeping the laser in lock. A diode laser is locked at a variable offset from a Doppler-free spectral feature of rubidium vapor. This is done by frequency shifting the laser before sending the light to a spectroscopy cell with an acousto-optic modulator (AOM). The frequency of the locked laser is switched quasi-instantaneously over much more than the width of the spectral features, i.e., the usual locking range. This is done by simultaneously switching the AOM frequency and applying feed-forward to the laser current. The advantage of our technique is that power loss and beam walk caused by the AOM do not affect the main output beam but only the small fraction of light used for the spectroscopy. The transient excursions of the laser frequency are only a few MHz and last approximately 0.2 ms, limited by the bandwidth of our locking electronics. We present equations that describe the transient behavior of the error signal and the laser frequency quantitatively. They are in good agreement with the measurements. The technique should be applicable to other types of lasers.
0946-2171
19-23
Cornelussen, R.A.
d07aaffc-0c5e-465c-bf74-081d2390c6d5
Huussen, T.N.
dd8d5dc6-388a-4dba-a018-2e2b483e8876
Spreeuw, R.J.C.
ad48e0ed-856a-4c5a-9e8e-47da8f9dbc84
Van Linden van den Heuvell, H.B.
e3a0fc49-3e02-425d-be40-43450f399fdb
Cornelussen, R.A.
d07aaffc-0c5e-465c-bf74-081d2390c6d5
Huussen, T.N.
dd8d5dc6-388a-4dba-a018-2e2b483e8876
Spreeuw, R.J.C.
ad48e0ed-856a-4c5a-9e8e-47da8f9dbc84
Van Linden van den Heuvell, H.B.
e3a0fc49-3e02-425d-be40-43450f399fdb

Cornelussen, R.A., Huussen, T.N., Spreeuw, R.J.C. and Van Linden van den Heuvell, H.B. (2004) Power-efficient frequency switching of a locked laser. Applied Physics B, 78 (1), 19-23. (doi:10.1007/s00340-003-1341-1).

Record type: Article

Abstract

We demonstrate a new and efficient laser-locking technique that enables making large frequency jumps while keeping the laser in lock. A diode laser is locked at a variable offset from a Doppler-free spectral feature of rubidium vapor. This is done by frequency shifting the laser before sending the light to a spectroscopy cell with an acousto-optic modulator (AOM). The frequency of the locked laser is switched quasi-instantaneously over much more than the width of the spectral features, i.e., the usual locking range. This is done by simultaneously switching the AOM frequency and applying feed-forward to the laser current. The advantage of our technique is that power loss and beam walk caused by the AOM do not affect the main output beam but only the small fraction of light used for the spectroscopy. The transient excursions of the laser frequency are only a few MHz and last approximately 0.2 ms, limited by the bandwidth of our locking electronics. We present equations that describe the transient behavior of the error signal and the laser frequency quantitatively. They are in good agreement with the measurements. The technique should be applicable to other types of lasers.

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Published date: 2004

Identifiers

Local EPrints ID: 42023
URI: http://eprints.soton.ac.uk/id/eprint/42023
ISSN: 0946-2171
PURE UUID: cca57b19-261b-4273-97fb-dcf236f949b5

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Date deposited: 06 Nov 2006
Last modified: 13 Mar 2019 21:13

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