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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 23 — Nov. 10, 2008
  • pp: 18667–18674

Stable confinement of nanosecond laser pulse in an enhancement cavity

R. Tanaka, T. Matsuzawa, H. Yokota, T. Suzuki, Y. Fujii, A. Mio, and M. Katsuragawa  »View Author Affiliations

Optics Express, Vol. 16, Issue 23, pp. 18667-18674 (2008)

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We present a technique that enhances the intensity of a nanosecond laser pulse by confining it in an enhancement cavity. The point of the technique is that a weak continuous-wave laser radiation, locked to the enhancement cavity, is injected into a nanosecond injection-locked pulsed laser as a seed. This leads to a stable confinement of the nanosecond pulse in the enhancement cavity. It is demonstrated that the pulsed intensity is enhanced by a factor of 120 for a 40-ns pulse, consistent with the theoretical prediction.

© 2008 Optical Society of America

OCIS Codes
(140.3520) Lasers and laser optics : Lasers, injection-locked
(140.4780) Lasers and laser optics : Optical resonators
(230.0230) Optical devices : Optical devices
(320.4240) Ultrafast optics : Nanosecond phenomena

ToC Category:
Lasers and Laser Optics

Original Manuscript: September 16, 2008
Revised Manuscript: October 23, 2008
Manuscript Accepted: October 27, 2008
Published: October 28, 2008

R. Tanaka, T. Matsuzawa, H. Yokota, T. Suzuki, Y. Fujii, A. Mio, and M. Katsuragawa, "Stable confinement of nanosecond laser pulse in an enhancement cavity," Opt. Express 16, 18667-18674 (2008)

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  8. We assume a typical specification of 7 mJ, 10 kHz at 532 nm for a high-repetition-rate, LD-pump, nanosecond pulsed laser. When we generate a tunable nanosecond single-frequency pulse with a specification of 2.5 mJ at 30 ns by employing such a nanosecond pulsed laser as a pump and then confine such pulses in an enhancement cavity with a finesse of 250, we can achieve a radiation intensity of 50 GW/cm2 and a Rayleigh length of 10 cm (beam waist diameter: ?200 ?m) at a repetition rate of 10 kHz.
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  10. In Figure 4, the peak of the transmitted pulse was delayed by 18.6 ns against that of the incident pulse. This delay is equivalent to the slowing of the light velocity by a factor of 1/74 against the speed of light in vacuum, since the cavity length was 7.5 cm.

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