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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 12 — Jun. 15, 2014
  • pp: 3410–3413

High-power, continuous-wave, solid-state, single-frequency, tunable source for the ultraviolet

A. Aadhi, Apurv Chaitanya N., R. P. Singh, and G. K. Samanta  »View Author Affiliations

Optics Letters, Vol. 39, Issue 12, pp. 3410-3413 (2014)

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We report the development of a compact, high-power, continuous-wave, single-frequency, ultraviolet (UV) source with extended wavelength tunability. The device is based on single-pass, intracavity, second-harmonic-generation (SHG) of the signal radiation of a singly resonant optical parametric oscillator (SRO) working in the visible and near-IR wavelength range. The SRO is pumped in the green with a 25-mm-long, multigrating, MgO doped periodically poled stoichiometric lithium tantalate (MgO:sPPLT) as nonlinear crystal. Using three grating periods, 8.5, 9.0, and 9.5 μm of the MgO:sPPLT crystal and a single set of cavity mirrors, the SRO can be tuned continuously across 710.7–836.3 nm in the signal and corresponding idler across 2115.8–1462.1 nm with maximum idler power of 1.9 W and maximum out-coupled signal power of 254 mW. By frequency-doubling the intracavity signal with a 5-mm-long bismuth borate (BIBO) crystal, we can further tune the SRO continuously over 62.8 nm across 355.4–418.2 nm in the UV with maximum single-frequency UV power, as much as 770 mW at 398.28 nm in a Gaussian beam profile. The UV radiation has an instantaneous line-width of 14.5 MHz and peak-peak frequency stability of 151 MHz over 100 s. More than 95% of the tuning range provides UV power > 260 mW . Access to lower UV wavelengths can in principle be realized by operating the SRO in the visible using shorter grating periods.

© 2014 Optical Society of America

OCIS Codes
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7220) Nonlinear optics : Upconversion

ToC Category:
Nonlinear Optics

Original Manuscript: April 9, 2014
Revised Manuscript: May 2, 2014
Manuscript Accepted: May 2, 2014
Published: June 4, 2014

A. Aadhi, Apurv Chaitanya N., R. P. Singh, and G. K. Samanta, "High-power, continuous-wave, solid-state, single-frequency, tunable source for the ultraviolet," Opt. Lett. 39, 3410-3413 (2014)

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