Nonlinear mode coupling in a CW operating Ti: Sapphire laser oscillator

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Cataluna, MA (Author) Other; Crespo, H (Author) FCUP; Guerreiro, A (Author) FCUP; Mendonca, JT (Author) Other

Journal

Title: Physica Scripta

Vol. T98

Pages: 134-136

ISSN: 0031-8949

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-RRH

DOI: 10.1238/physica.topical.098a00134

Abstract (EN): We experimentally observe a high-contrast intensity modulation in the multimode CW output of a Titanium:Sapphire laser, This modulation has a very low frequency (in the hundreds of Hz range), being stable and self-sustaining, unlike previously reported regimes which require external perturbations such as a periodic change in the resonant cavity length. This effect results from the nonlinear coupling of several longitudinal modes with very large frequency spacing (of the order of tens of THz) which arise due to mode competition violation (promoted by dispersion control within the laser cavity), associated with the large gain bandwidth of Ti:Sapphire, To our knowledge, this is a previously unreported phenomenon. for which we are currently developing an adequate theoretical model. These results may prove useful in the further understanding of the onset of mode-locked operation in ultrashort lasers and other highly nonlinear systems.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3