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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 3 — Feb. 4, 2008
  • pp: 1546–1551

Efficient 2nd and 4th harmonic generation of a single-frequency, continuous-wave fiber amplifier

Thomas Südmeyer, Yutaka Imai, Hisashi Masuda, Naoya Eguchi, Masaki Saito, and Shigeo Kubota  »View Author Affiliations

Optics Express, Vol. 16, Issue 3, pp. 1546-1551 (2008)

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We demonstrate efficient cavity-enhanced second and fourth harmonic generation of an air-cooled, continuous-wave (cw), single-frequency 1064 nm fiber-amplifier system. The second harmonic generator achieves up to 88% total external conversion efficiency, generating more than 20-W power at 532 nm wavelength in a diffraction-limited beam (M2<1.05). The nonlinear medium is a critically phase-matched, 20-mm long, anti-reflection (AR) coated LBO crystal operated at 25°C. The fourth harmonic generator is based on an AR-coated, Czochralski-grown β-BaB2O4 (BBO) crystal optimized for low loss and high damage threshold. Up to 12.2 W of 266-nm deep-UV (DUV) output is obtained using a 6-mm long critically phase-matched BBO operated at 40°C. This power level is more than two times higher than previously reported for cw 266-nm generation. The total external conversion efficiency from the fundamental at 1064 nm to the fourth harmonic at 266 nm is >50%.

© 2008 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(260.7190) Physical optics : Ultraviolet

ToC Category:
Nonlinear Optics

Original Manuscript: October 1, 2007
Revised Manuscript: January 14, 2008
Manuscript Accepted: January 17, 2008
Published: January 22, 2008

Thomas Sudmeyer, Yutaka Imai, Hisashi Masuda, Naoya Eguchi, Masaki Saito, and Shigeo Kubota, "Efficient 2nd and 4th harmonic generation of a single-frequency, continuous-wave fiber amplifier," Opt. Express 16, 1546-1551 (2008)

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