Ti:sapphire laser resonator with low group-velocity dispersion

Piotr Wiewior; Czeslaw Radzewicz

doi:10.1117/12.203288

1 March 1995 Ti:sapphire laser resonator with low group-velocity dispersion

Piotr Wiewior, Czeslaw Radzewicz

Proceedings Volume 2202, Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing; (1995) https://doi.org/10.1117/12.203288
Event: Laser Technology: Fourth Symposium, 1993, Szczecin, Poland

Abstract

Ti:sapphire femtosecond laser pulse duration is limited by the group-velocity dispersion (GVD) of the laser cavity with the main contribution coming from the laser rod itself. The GVD of Ti:sapphire crystal is positive throughout its tuning range thus, in order to minimize the effect, one has to include into the laser cavity a negative GVD delay line. Several designs based on Brewster cut prisms made out of different materials have been reported so far. In this paper we consider delay lines consisting of two- and four-prisms sequences, both in double pass configuration. The four prism sequence is an attractive solution since use of two pairs of prisms made from different materials gives one more control over the dispersive properties of the delay line. We use the method of the ray tracing to estimate wavelength dependent group velocity delay for two- and four-prism sequences. Results of our computer calculations indicate clearly that a four-prism delay line is superior to that of a two-prism, providing very similar cancellation of third-order dispersion, as two prism sequence has considerably longer interprism separation.

Citation Download Citation

Piotr Wiewior and Czeslaw Radzewicz "Ti:sapphire laser resonator with low group-velocity dispersion", Proc. SPIE 2202, Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing, (1 March 1995); https://doi.org/10.1117/12.203288

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KEYWORDS

Prisms

Dispersion

Glasses

Laser resonators

Sapphire lasers

Femtosecond phenomena

Mode locking

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