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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Editor: Zhizhan Xu
  • Vol. 10, Iss. 3 — Mar. 1, 2012
  • pp: 031403–

Achieving strong doubling power by optical phase-locked Ti:sapphire laser and MOPA system

Yu Peng, Baike Lin, Qiang Wang, Yang Zhao, Ye Li, Jianping Cao, Zhanjun Fang, and Erjun Zang  »View Author Affiliations


Chinese Optics Letters, Vol. 10, Issue 3, pp. 031403- (2012)


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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, 84Sr, 86Sr, 87Sr, and 88Sr, are detected by probing the laser during a strong 460.7-nm cycling transition (5s21S0-5s5p1P1).

© 2012 Chinese Optics Letters

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(140.3320) Lasers and laser optics : Laser cooling
(140.3580) Lasers and laser optics : Lasers, solid-state
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(140.3515) Lasers and laser optics : Lasers, frequency doubled

ToC Category:
Lasers and Laser Optics

Citation
Yu Peng, Baike Lin, Qiang Wang, Yang Zhao, Ye Li, Jianping Cao, Zhanjun Fang, and Erjun Zang, "Achieving strong doubling power by optical phase-locked Ti:sapphire laser and MOPA system," Chin. Opt. Lett. 10, 031403- (2012)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-10-3-031403


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References

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