Journal article
Dispersive heterodyne probing method for laser frequency stabilization based on spectral hole burning in rare-earth doped crystals
Department of Physics, Technical University of Denmark1
Quantum Physics and Information Technology, Department of Physics, Technical University of Denmark2
Université PSL3
Samsung4
Université Grenoble Alpes5
Fraunhofer Institute for Physical Measurement Techniques6
CNRS7
Sorbonne Université8
Institut universitaire de France9
Frequency-locking a laser to a spectral hole in rare-earth doped crystals at cryogenic temperature has been shown to be a promising alternative to the use of high finesse Fabry-Perot cavities when seeking a very high short term stability laser (M. J. Thorpe et al., Nature Photonics 5, 688 (2011)). We demonstrate here a novel technique for achieving such stabilization, based on generating a heterodyne beat-note between a master laser and a slave laser whose dephasing caused by propagation near a spectral hole generate the error signal of the frequency lock.
The master laser is far detuned from the center of the inhomogeneous absorption profile, and therefore exhibits only limited interaction with the crystal despite a potentially high optical power. The demodulation and frequency corrections are generated digitally with a hardware and software implementation based on a field-programmable gate array and a Software Defined Radio platform, making it straightforward to address several frequency channels (spectral holes) in parallel.
Language: | English |
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Year: | 2017 |
Pages: | 15539-15548 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OE.25.015539 |