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Applied Physics B

Laser-induced spectral broadening and hole-burning in rare earth doped crystals and coherent optical spectroscopy for frequency upconversion

Jianying Zhou, G.Q. Wang, D.C. Dai, Liping Luo, Kam Sing Wong, YiJing Yan

Published Mar 25, 2004• 1 citation
Publisher
DOI
10.1007/s00340-004-1474-x

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Saturation spectroscopy of Iodine is used to lock the frequency of a Coherent 699-21 Ring Dye laser. Without an external reference the laser frequency drifts several tens of MHz per hour. With the system presented in this thesis the drift has been reduced to a maximum of ±lMHz. Theoretical description of saturation spectroscopy and hole burning is given and the experiments are presented. In preparation for future experiments in quantum computing hole burning in rare-earth-ion-doped crystals and broadening of the hole by excitation of ions at different intervals have also been studied in this master's thesis.
We describe a spectroscopic method applicable to inhomogeneously broadened transitions. As a test system we use suitable rare-earth-doped solids in which persistent spectral holes can be burned on weakly allowed electronic transitions. These systems are of interest as frequency references for the stabilization of laser frequencies. In all experiments so far, spectral holes are burned and read out individually. Here we present a demonstration of simultaneous burning and readout of sets of spectral holes, containing up to 1024 individual spectral holes, by a comb of laser frequencies. The simultaneous readout of such a set leads to an effective compound signal that has a higher signal-to-noise ratio. Here, an improvement by a factor of 20 was obtained for a set of 512 spectral holes. We use the method to stabilize the frequency of a laser and characterize its stability.