Abstract
We show two external cavity-enhanced second-harmonic generations of 922 nm
with periodically poled potassium titanyl phosphate crystal, whose doubling cavities
are locked separately with Hansch-Couillaud and intra-modulation methods. The
outputs of second-harmonic generation reach 310 mW, 54.8% of the conversion
efficiency from the Ti:sapphire laser with the crystal length of 10 mm, and 208 mW,
59% of the conversion efficiency from the MOPA system with the crystal length of 30
mm. It consists of heterodyning the Ti:sapphire laser and the MOPA system, and
compares the phase of the beat frequency signal with the phase of a reference RF
local oscillator. The resulting phase error is used as a feedback signal and fed
back to the reference cavity of the Ti:sapphire laser to lock the two lasers in
phase. A stable blue power of 520 mW is obtained, which supplies enough power for
the cooling and trapping step of the strontium (Sr) optical lattice clock. Four
stable isotopes of Sr, <sup>84</sup>Sr, <sup>86</sup>Sr, <sup>87</sup>Sr, and
<sup>88</sup>Sr, are detected by probing the laser during a strong 460.7-nm
cycling transition (5s<sup>21</sup>S<sub>0-5s5</sub>p<sup>1</sup>P<sub>1</sub>).
© 2012 Chinese Optics Letters
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