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Review of Scientific Instruments / Volume 81 / Issue 6 / ARTICLES / Optics; Atoms and Molecules; Spectroscopy; Photon Detectors

Rev. Sci. Instrum. 81, 063106 (2010); http://dx.doi.org/10.1063/1.3436973 (10 pages)

Generation of tunable narrow bandwidth nanosecond pulses in the deep ultraviolet for efficient optical pumping and high resolution spectroscopy

Luis Velarde1, Daniel P. Engelhart1, Daniel Matsiev1, Jerry LaRue1, Daniel J. Auerbach1,2, and Alec M. Wodtke1

1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA
2Gas Reaction Technologies, 861 Ward Drive, Santa Barbara, California 93111, USA

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(Received 22 April 2010; accepted 6 May 2010; published online 17 June 2010)

Nanosecond optical pulses with high power and spectral brightness in the deep ultraviolet (UV) region have been produced by sum frequency mixing of nearly transform-limited-bandwidth IR light originating from a home-built injection-seeded ring cavity KTiOPO4 optical parametric oscillator (OPO) and the fourth harmonic beam of an injection-seeded Nd:YAG laser used simultaneously to pump the OPO with the second harmonic. We demonstrate UV output, tunable from 204 to 207 nm, which exhibits pulse energies up to 5 mJ with a bandwidth better than 0.01 cm−1. We describe how the approach shown in this paper can be extended to wavelengths shorter than 185 nm. The injection-seeded OPO provides high conversion efficiency (>40% overall energy conversion) and superior beam quality required for highly efficient downstream mixing where sum frequencies are generated in the UV. The frequency stability of the system is excellent, making it highly suitable for optical pumping. We demonstrate high resolution spectroscopy as well as optical pumping using laser-induced fluorescence and stimulated emission pumping, respectively, in supersonic pulsed molecular beams of nitric oxide.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
    1. Injection-seeded OPO
    2. Generation of narrow-band deep-UV pulses
    3. OPO cavity locking and frequency stabilization
  3. SYSTEM PERFORMANCE
    1. Applications to high resolution spectroscopy and optical pumping
    2. OPO characteristics
  4. SUMMARY

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KEYWORDS and PACS

Keywords

brightness, fluorescence, frequency stability, laser beams, nitrogen compounds, optical harmonic generation, optical parametric oscillators, optical pulse generation, optical pumping, optical resonators, potassium compounds, stimulated emission, titanium compounds, ultraviolet spectra

PACS

  • 42.65.Ky

    Frequency conversion; harmonic generation, including higher-order harmonic generation

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

  • 42.60.Jf

    Beam characteristics: profile, intensity, and power; spatial pattern formation

  • 42.65.Lm

    Parametric down conversion and production of entangled photons

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3436973

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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