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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CThH4

Chirped-mirror dispersion-compensated femtosecond optical parametric oscillator

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Abstract

We report on the application of chirped mirrors for group-velocity-dispersion (GVD) compensation in a noncritically-phase-matched KTP optical parametric oscillator (OPO)1,2 pumped by 120–150-fs pulses from a Coherent MIRA Ti:sapphire laser. Figure 1 shows the cavity configuration. The properties of the OPO were first investigated by using standard single-stack mirrors for M1 – M4; then, in a second set of experiments, M2 and M4 were replaced by chirped mirrors.3 As a next step, two additional chirped mirrors have been inserted into the beam path in the cavity between M4 and M1. Varying the number of reflections on these mirrors allows a stepwise change of the magnitude of the GVD. All chirped mirrors used in the experiments are calculated to have −85-fs2 GVD in the 1.10-1.44-μm spectral range. The material dispersion of the 2-mm-long KTP crystal is 170 fs2 at 1.25 μm. Therefore, two chirped mirrors should be sufficient to compensate the material GVD caused by the KTP at that wavelength. The tuning range of the OPO is 1.18-1.32 μm independent of the number of the chirped mirrors used in the cavity.

© 1995 Optical Society of America

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