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All-solid-state tunable continuous-wave ultraviolet source with high spectral purity and frequency stability.

Harald Schnitzler1, Ulf Fröhlich, Tobias K W Boley

  • 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.

Applied Optics
|December 5, 2002
PubMed
Summary
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Researchers developed a new method for generating stable, tunable ultraviolet (UV) light for spectroscopy. This technique uses sum-frequency generation (SFG) to produce UV light with high frequency stability and tunability.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Laser Physics and Photonics

Background:

  • High-resolution spectroscopy demands highly frequency-stable and tunable light sources.
  • Current ultraviolet (UV) light generation methods often face limitations in stability, tunability, or output power.

Purpose of the Study:

  • To present a novel approach for generating highly frequency-stable, widely tunable, single-frequency continuous-wave (cw) UV light.
  • To demonstrate the suitability of this UV light for high-resolution spectroscopic applications.

Main Methods:

  • Employed sum-frequency generation (SFG) utilizing two solid-state laser sources within a single cavity resonant for both fundamental waves.
  • Utilized a frequency-doubled continuous-wave (cw) Nd:YAG laser as a master laser, slaving the SFG cavity and a Ti:sapphire laser (or diode laser) to it.

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Main Results:

  • Generated UV radiation around 313 nm with 33-mW output power using a Ti:sapphire laser.
  • Achieved 2.1-mW output power at 313 nm when using a diode laser.
  • Demonstrated continuous tunability exceeding 15 GHz, sub-megahertz short-term frequency fluctuations, and long-term frequency drift below 100 MHz/h.
  • Maintained stable operation for several hours.

Conclusions:

  • The developed SFG approach provides a robust method for generating high-quality UV light.
  • The generated UV light meets the stringent requirements for high-resolution spectroscopy due to its stability and tunability.
  • The theoretical framework for optimized doubly resonant SFG is presented, supporting the experimental findings.