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We are developing a continuous-wave (cw) optical parametric oscillator as a tunable cw light source used in an optical frequency synthesizer. The tuning range from 777 nm to 1687 nm was obtained with a 5% MgO doped LiNbO3 as a nonlinear crystal. The Doppler broadened fluorescence profile of the Cs-D2 line (852.357 nm) was observed and we could demonstrate the tunability to arbitrary wavelength. The next target is the high-resolution spectroscopy of atoms and molecules with a cw-OPO phase-locked to an optical comb.
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Fig 1: Temperature tuning curve of the continuous-wave optical parametric oscillator
By tuning the crystal temperature from 108°C to 235°C, the cw-OPO generated the wavelengths from 777nm to 1687nm, which is more than 1 octave. The signal light and the idler light at same temperature point oscillate simultameously.
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Fig 2: Observed Doppler-broadened signal from the Cs-D2 line (852nm)
The transition from a ground state hyperfine level F=4 to excited states F'=3,4,5 was obssrved. An electrooptic modulator was used for continuous frequency tuning. Blue line: signal light intensity, Green line: light intensity transmitted through the cell, Red line: fluorescence intensity from the cell. The light was blocked at 17.9 GHz and 18.3 GHz for the zero-level calibration of photodetectors.
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| Relational Information |
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AIST Today Vol.5, No.5 (2005) p.32-33
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