dorsal/arxiv
View Schema$\beta$-BaB$_2$O$_4$ deep UV monolithic walk-off compensating tandem
| Authors | J. Friebe, K. Moldenhauer, E. M. Rasel, W. Ertmer, L. Isaenko, A. Yelisseyev, J. -J. Zondy |
|---|---|
| Categories | |
| ArXiv ID | physics/0512190 |
| URL | https://arxiv.org/abs/physics/0512190 |
| DOI | 10.1016/j.optcom.2005.12.008 |
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. In this work, we investigate a novel approach to cw deep-UV generation by employing the low-loss BBO in a monolithic walkoff-compensating structure [Zondy {\it{et al}}, J. Opt. Soc. Am. B {\bf{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 $L_c=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 $\lambda=570.4$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 $\sim-1$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.
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"abstract": "The generation of watt-level cw narrow-linewidth sources at specific deep UV\nwavelengths corresponding to atomic cooling transitions usually employs\nexternal cavity-enhanced second-harmonic generation (SHG) of moderate-power\nvisible lasers in birefringent materials. In this work, we investigate a novel\napproach to cw deep-UV generation by employing the low-loss BBO in a monolithic\nwalkoff-compensating structure [Zondy {\\it{et al}}, J. Opt. Soc. Am. B\n{\\bf{20}} (2003) 1675] to simultaneously enhance the effective nonlinear\ncoefficient while minimizing the UV beam ellipticity under tight focusing. As a\npreliminary step to cavity-enhanced operation, and in order to apprehend the\ndesign difficulties stemming from the extremely low acceptance angle of BBO, we\ninvestigate and analyze the single-pass performance of a $L_c=8 $mm monolithic\nwalk-off compensating structure made of 2 optically-contacted BBO plates cut\nfor type-I critically phase-matched SHG of a cw $\\lambda=570.4$nm dye laser. As\ncompared with a bulk crystal of identical length, a sharp UV efficiency\nenhancement factor of 1.65 has been evidenced with the tandem structure, but at\n$\\sim-1$nm from the targeted fundamental wavelength, highlighting the\nsensitivity of this technique when applied to a highly birefringent material\nsuch as BBO. Solutions to angle cut residual errors are identified so as to\nmatch accurately more complex periodic-tandem structure performance to any\ntarget UV wavelength, opening the prospect for high-power, good beam quality\ndeep UV cw laser sources for atom cooling and trapping.",
"arxiv_id": "physics/0512190",
"authors": [
"J. Friebe",
"K. Moldenhauer",
"E. M. Rasel",
"W. Ertmer",
"L. Isaenko",
"A. Yelisseyev",
"J. -J. Zondy"
],
"categories": [
"physics.optics"
],
"doi": "10.1016/j.optcom.2005.12.008",
"title": "$\\beta$-BaB$_2$O$_4$ deep UV monolithic walk-off compensating tandem",
"url": "https://arxiv.org/abs/physics/0512190"
},
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