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.

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References

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IEEE 17th International Semiconductor La

B. Schmidt, S. Pawlik, H. Rothfritz, A. Thies, S. Mordiek, and C. Harder, ?400mW 980nm-Module with very high Power Conversion Efficiency,? in 2000 IEEE 17th International Semiconductor Laser Conference, Conference Digest, pp. 29-30.

IEEE J. of Selected Topics in Quantum El

F. X. K?rtner, J. Aus der Au, and U. Keller, ?Mode-Locking with Slow and Fast Saturable Absorbers -What?s the Difference?,? IEEE J. of Selected Topics in Quantum Electron. 4, 159-168 (1998).
[CrossRef]

J. Cryst. Growth

G. M?trat, M. Boudeulle, N. Muhlstein, A. Brenier, and G. Boulon, ?Nucleation, morphology and spectroscopic properties of Yb3+-doped KY(WO4)2 crystals grown by the top nucleated floating crystal method,? J. Cryst. Growth 197, 883-888 (1999) .
[CrossRef]

J. Opt. Soc. Am. B

Opt. Lett.

Opt. Mat.

C. Pujol, M. Aguil?, F. D?az, and C. Zaldo, ?Growth and characterisation of monoclinic KGd1-xREx(WO4)2 single crystals,? Opt. Mat. 13, 33-40 (1999).
[CrossRef]

OSA Trends in Optics and Photonics

H. Liu, J. Nees, and G. Mourou, ?Diode-pumped Kerr-lens mode-locked Yb:KYW laser,? in OSA Trends in Optics and Photonics (TOPS) Vol. 56, Conference on Lasers and Electro-Optics (CLEO 2001), Technical Digest (Optical Society of America, Washington DC, 2001), pp. 30-31.

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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)

Tables Icon

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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