Frequency locking a laser on a spectral hole pattern with a multi-channel heterodyne method using SDRand GnuRadio
High precision spectroscopic probing of a narrow spectral hole pattern imprinted in the inhom-geneously broadened absorption spectrum of Eu3+: Y2SiO5 crystal can be used to stabilize a laser frequency. A multi-hole pattern can be burn and all the holes can be probed simultaneously using a multiple frequency signal. The dispersion induced dephasing acquired by the light through the crystal is measured to derive an error signal suitable to lock the laser frequency to the spectral hole pattern. An Ettus USRP X310 driven by a python program based on GNU Radio is used for both generating the multiple frequency signal and to compute the correction applied to the laser frequency.
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