Mode-locking operating points of a three-element-cavity femtosecond Cr4+:YAG laser

✍ Scribed by Tatsuya Tomaru

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 486 KB
• Volume: 225
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2003.08.014

✦ Synopsis

High-repetition-rate femtosecond lasers can perform a mode-locked operation in a wide area of a stability region. The performance of mode locking depends on the operating point. An inadequate operating point often causes residual cw lines and an unstable mode-locked operation. Conditions allowing good performance were analyzed from the viewpoints of beam radius and degenerate cavity. The former is important to optimize the Kerr-lens effect, and the latter is important to mode-lock not only the longitudinal but also the transverse modes. For the optimum operating point, a pulse width of 68 fs was obtained at a high repetition rate of 2.33 GHz. The average output power was 138 mW, and the spectral width was 33 nm at a center wavelength of 1.52 lm.