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Passively mode-locked Yb:KYW laser pumped by a tapered diode laser

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Abstract

We demonstrate the operation of a low threshold femtosecond Yb:KYW laser, using a saturable absorber mirror for passive mode-locking and a high brightness laser diode as pumping source. Fourier-limited pulses with a duration of 101 fs are achieved at an output power of ≈100 mW. The performance of the Yb:KYW laser was also compared to that of Yb:KGW and Yb:glass in the same setup.

©2002 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Absorption and emission cross sections of Yb:KYW compared to Yb:glass and Yb:YAG.
Fig. 2.
Fig. 2. Scheme of the tapered diode laser (TDL) used as pump source in our experiments (Pmax = 2W,M2slow<3).
Fig. 3.
Fig. 3. Effective far field of the slow axis emission from the tapered diode laser (TDL).
Fig. 4.
Fig. 4. Setup of the femtosecond Yb:KYW laser: SESAM - semiconductor saturable absorber mirror; M1 - focusing mirror (r = 100 to 150 mm); M2, M3 - folding mirrors (r = 100 mm), P1, P2 - SF10 Brewster prisms; M4 - output coupler (Toutput coupler = 1 to 5%); Yb:KYW - 3-mm-long, 5 at% Yb3+-doped crystal; TDL - tapered diode laser; LA - aspherical lens; LC - cylindrical lens; LP - focusing lens.
Fig. 5.
Fig. 5. Spectrum (a) and intensity autocorrelation (b) of the Yb:KYW laser.

Tables (1)

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Table 1. Comparison of Yb:KYW performance with that of Yb:KGW and Yb: fluoride phosphate glass (bold: maximum output powers, minimum pulse durations).

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