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Highly efficient and low threshold diode-pumped Kerr-lens mode-locked Yb:KYW laser

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Abstract

We report a highly efficient diode-pumped femtosecond Yb:KYW laser with a compact three-element resonator. Near-transform-limited pulses of 107fs duration at a centre wavelength of 1056nm are produced at a pulse repetition frequency of 294MHz by utilising soft-aperture Kerr-lens mode locking. The femtosecond operation had a mode-locking threshold at a pump power of 250mW and the laser was tunable from 1042nm to 1075nm. The optical-to-optical conversion efficiency exceeded 50% in this femtosecond-pulse regime.

©2004 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. (a) Three-element KLM Yb:KYW laser set-up. LD - single mode fibre-coupled InGaAs laser diode; CL - 11mm aspherical lens; HW - half wave plate; FL - 63mm focusing lens; M1 - high-reflector plane mirror; M2 - high-reflector folding mirror (r=50mm); OC - 1% output coupler. (b) Schematic of the Yb:KYW crystal orientation.
Fig.2.
Fig.2. Slope efficiency data for cw Yb:KYW laser versus thickness of Yb:KYW crystal.
Fig. 3.
Fig. 3. (a) Measured stability map for the three-element Yb:KYW laser. The region where soft aperture KLM appears is marked by the arrow. (b) Output beam profile during the cw (top) and the KLM (bottom) operation.
Fig. 4.
Fig. 4. Tunability of the three-element femtosecond Yb:KYW laser within a wavelength range of over 30nm. Bottom, measured pulse spectra; top, corresponding output powers (left axis) and pulse duration (right axis).
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