β-BaB2O4 deep UV monolithic walk-off compensating tandem

J. Friebe, K. Moldenhauer, E. M. Rasel, W. Ertmer, L. Isaenko, A. Yelisseyev, J. J. Zondy

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The generation of watt-level cw narrow-linewidth sources at specific deep-UV wavelengths corresponding to atomic cooling transitions usually employs external cavity-enhanced second-harmonic generation (SHG) of moderate-power visible lasers in birefringent materials. Among the oxo-borate materials, barium borate (β-BaB2O4 or BBO) combines the highest UV band edge and largest nonlinearity but suffers from large walk-off angles that limits the nonlinear interaction length. Alternative quasi-phase-matched (QPM) ferroelectrics are hardly suited for cavity-enhanced operation due to their much larger UV absorption and associated photo-refractive and thermal lensing effects, in addition to the difficult fabrication of fine-pitch domain gratings for short UV coherence lengths. In this work, we investigate an alternative approach to cw deep-UV generation by employing the low-loss BBO in a monolithic walk-off compensating structure [J.-J. Zondy, Ch. Bonnin, D. Lupinski, J. Opt. Soc. Am. B 20 (2003) 1675] to simultaneously enhance the effective nonlinear coefficient while minimizing the UV beam ellipticity under tight focusing. As a preliminary step to cavity-enhanced operation, and in order to apprehend the design difficulties stemming from the extremely low acceptance angle of BBO, we investigate and analyze the single-pass performance of a Lc = 8 mm monolithic walk-off compensating structure made of 2 optically-contacted BBO plates cut for type-I critically phase-matched SHG of a cw λ = 570.4 nm dye laser. As compared with a bulk crystal of identical length, a sharp UV efficiency enhancement factor of 1.65 has been evidenced with the tandem structure, but at ∼-1 nm from the targeted fundamental wavelength, highlighting the sensitivity of this technique when applied to a highly birefringent material such as BBO. Solutions to angle cut residual errors are identified so as to match accurately more complex periodic-tandem structure performance to any target UV wavelength, opening the prospect for high-power, good beam quality deep-UV cw laser sources for atom cooling and trapping.

Original languageEnglish
Pages (from-to)300-309
Number of pages10
JournalOptics Communications
Volume261
Issue number2
DOIs
Publication statusPublished - May 15 2006
Externally publishedYes

Fingerprint

Borates
Harmonic generation
borates
Wavelength
cavities
harmonic generations
wavelengths
Cooling
cooling
Dye lasers
thermal lensing
Beam quality
Lasers
ellipticity
Barium
ultraviolet lasers
dye lasers
acceptability
Linewidth
Thermal effects

Keywords

  • Type-I monolithic walk-off compensation
  • UV atom cooling and trapping
  • UV cw second-harmonic generation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Friebe, J., Moldenhauer, K., Rasel, E. M., Ertmer, W., Isaenko, L., Yelisseyev, A., & Zondy, J. J. (2006). β-BaB2O4 deep UV monolithic walk-off compensating tandem. Optics Communications, 261(2), 300-309. https://doi.org/10.1016/j.optcom.2005.12.008

β-BaB2O4 deep UV monolithic walk-off compensating tandem. / Friebe, J.; Moldenhauer, K.; Rasel, E. M.; Ertmer, W.; Isaenko, L.; Yelisseyev, A.; Zondy, J. J.

In: Optics Communications, Vol. 261, No. 2, 15.05.2006, p. 300-309.

Research output: Contribution to journalArticle

Friebe, J, Moldenhauer, K, Rasel, EM, Ertmer, W, Isaenko, L, Yelisseyev, A & Zondy, JJ 2006, 'β-BaB2O4 deep UV monolithic walk-off compensating tandem', Optics Communications, vol. 261, no. 2, pp. 300-309. https://doi.org/10.1016/j.optcom.2005.12.008
Friebe J, Moldenhauer K, Rasel EM, Ertmer W, Isaenko L, Yelisseyev A et al. β-BaB2O4 deep UV monolithic walk-off compensating tandem. Optics Communications. 2006 May 15;261(2):300-309. https://doi.org/10.1016/j.optcom.2005.12.008
Friebe, J. ; Moldenhauer, K. ; Rasel, E. M. ; Ertmer, W. ; Isaenko, L. ; Yelisseyev, A. ; Zondy, J. J. / β-BaB2O4 deep UV monolithic walk-off compensating tandem. In: Optics Communications. 2006 ; Vol. 261, No. 2. pp. 300-309.
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