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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 20 — Oct. 1, 2007
  • pp: 13043–13048

Low-threshold, room-temperature femtosecond Cr4+:forsterite laser

Alphan Sennaroglu, Franz X. Kaertner, and James G. Fujimoto  »View Author Affiliations

Optics Express, Vol. 15, Issue 20, pp. 13043-13048 (2007)

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We describe a low-threshold Cr4+:forsterite laser which can be operated in continuous-wave as well as Kerr-lens mode-locked regimes at room temperature. To achieve low lasing thresholds, a 3-mm-long Cr4+:forsterite crystal with a single-pass absorption of 41% was used to reduce the passive losses. Furthermore, a thin crystal was used to minimize the pump induced thermal gradients. During continuous-wave operation, absorbed threshold pump powers as low as 290 mW were obtained at 20°C in single-pass pumping with a Yb fiber laser. To the best of our knowledge, this is the lowest pump threshold reported to date for Cr4+:forsterite lasers. Furthermore, Kerr-lens mode locking could also be obtained using dispersion compensation with double-chirped mirrors. With an input pump power of 3 W, nearly transform-limited 86-fs pulses were obtained at a repetition rate of 200 MHz and with an average output power of 85 mW.

© 2007 Optical Society of America

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 17, 2007
Revised Manuscript: September 19, 2007
Manuscript Accepted: September 23, 2007
Published: September 25, 2007

Alphan Sennaroglu, Franz X. Kaertner, and James G. Fujimoto, "Low-threshold, room-temperature femtosecond Cr4+:forsterite laser," Opt. Express 15, 13043-13048 (2007)

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