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Applied Optics

Applied Optics


  • Vol. 42, Iss. 21 — Jul. 20, 2003
  • pp: 4320–4326

Enhancement of spectral purity of injection-seeded titanium:sapphire laser by cavity locking and stimulated Brillouin scattering

Wonchul Lee and Walter R. Lempert  »View Author Affiliations

Applied Optics, Vol. 42, Issue 21, pp. 4320-4326 (2003)

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We report improvements to and better characterization of the spectral purity of a diode laser injection-seeded, cavity-locked titanium:sapphire laser that serves as the source for a previously reported rubidium vapor spectrally filtered Thomson scattering apparatus at 780.24 nm. In a detailed set of measurements the spectral purity P of the laser, defined as the ratio of the narrowband component of the laser output to the total output, has been studied as a function of frequency mismatch between the seed laser frequency and the central frequency of the unseeded cavity. It is found that spectral purity exceeding 0.999 can be obtained for a seed-cavity mismatch as high as ±0.25 nm, corresponding to approximately 950 cavity longitudinal-mode spacings and as high as ∼0.9999 for a cavity-seed mismatch in the range ±0.10 nm (380 mode spacings). It is also shown that the addition of an external-cavity stimulated Brillouin-scattering phase-conjugate mirror increases both the spectral purity, to a minimum of 0.99999, and the cavity-seed mismatch range, to ±0.25 nm, for which this maximum effective purity is obtained.

© 2003 Optical Society of America

OCIS Codes
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(140.3520) Lasers and laser optics : Lasers, injection-locked

Original Manuscript: April 10, 2003
Revised Manuscript: April 10, 2003
Published: July 20, 2003

Wonchul Lee and Walter R. Lempert, "Enhancement of spectral purity of injection-seeded titanium:sapphire laser by cavity locking and stimulated Brillouin scattering," Appl. Opt. 42, 4320-4326 (2003)

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