dorsal/arxiv
View SchemaPower-efficient frequency switching of a locked laser
| Authors | R. A. Cornelussen, T. N. Huussen, R. J. C. Spreeuw, H. B. van Linden van den Heuvell |
|---|---|
| Categories | |
| ArXiv ID | physics/0307048 |
| URL | https://arxiv.org/abs/physics/0307048 |
| DOI | 10.1007/s00340-003-1341-1 |
| Journal | Appl. Phys. B 78, 19--23 (2004) |
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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"abstract": "We demonstrate a new and efficient laser-locking technique that enables\nmaking large frequency jumps while keeping the laser in lock. A diode laser is\nlocked at a variable offset from a Doppler-free spectral feature of rubidium\nvapor. This is done by frequency shifting the laser before sending the light to\na spectroscopy cell with an acousto-optic modulator (AOM). The frequency of the\nlocked laser is switched quasi-instantaneously over much more than the width of\nthe spectral features, i.e. the usual locking range. This is done by\nsimultaneously switching the AOM frequency and applying feed-forward to the\nlaser current. The advantage of our technique is that power loss and beam walk\ncaused by the AOM do not affect the main output beam, but only the small\nfraction of light used for the spectroscopy. The transient excursions of the\nlaser frequency are only a few MHz and last approximately 0.2 ms, limited by\nthe bandwidth of our locking electronics. We present equations that describe\nthe transient behavior of the error signal and the laser frequency\nquantitatively. They are in good agreement with the measurements. The technique\nshould be applicable to other types of lasers.",
"arxiv_id": "physics/0307048",
"authors": [
"R. A. Cornelussen",
"T. N. Huussen",
"R. J. C. Spreeuw",
"H. B. van Linden van den Heuvell"
],
"categories": [
"physics.atom-ph",
"physics.ins-det"
],
"doi": "10.1007/s00340-003-1341-1",
"journal_ref": "Appl. Phys. B 78, 19--23 (2004)",
"title": "Power-efficient frequency switching of a locked laser",
"url": "https://arxiv.org/abs/physics/0307048"
},
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