Journal article Open Access

Double-heterodyne probing for ultra-stable laser based on spectral hole burning in a rare-earth doped crystal

Galland, N.; Lučić, N.; Zhang, S.; Alvarez-Martinez, H.; Le Targat, R.; Ferrier, A.; Goldner, P.; Fang, B.; Seidelin, S.; Le Coq, Y.


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    <subfield code="a">Double-heterodyne probing for ultra-stable laser based on spectral hole burning in a rare-earth doped crystal</subfield>
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    <subfield code="a">&lt;p&gt;We present an experimental technique for realizing a specific absorption spectral pattern in a rare-earth-doped crystal at cryogenic temperatures. This pattern is subsequently probed on two spectral channels simultaneously, thereby producing an error signal allowing frequency locking of a laser on the said spectral pattern. Appropriate combination of the two channels leads to a substantial reduction of the detection noise, paving the way to realizing an ultra-stable laser for which the detection noise can be made arbitrarily low when using multiple channels. We use such technique to realize a laser with a frequency instability of&amp;nbsp;1.7&amp;nbsp;&amp;times;&amp;nbsp;10&amp;minus;15&amp;nbsp;at 1 second, not limited by the detection noise but by environmental perturbation of the crystal. This is comparable with the lowest instability demonstrated at 1 second to date for rare-earth doped crystal stabilized lasers.&lt;/p&gt;</subfield>
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