Abstract

We demonstrate passive mode locking based on the novel monoclinic double tungstate crystal Yb:KLu(WO4)2. We report the shortest pulses ever produced with an Yb-doped tungstate laser using a semiconductor saturable absorber. A pulse duration of 81 fs has been achieved for an average power of 70 mW at 1046 nm. We compare the performance of the polarization oriented parallel to the Nm- and Np-crystallo-optic axes. Results in the femtosecond and picosecond regime are presented applying either Ti:sapphire or diode laser pumping. The great potential of Yb:KLu(WO4)2 as an active medium for ultrashort pulses is demonstrated for the first time, to our knowledge.

© 2005 Optical Society of America

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Appl. Phys. B (3)

C. Hönninger, R. Paschotta, M. Graf, F. Morier-Genoud, G. Zhang, M. Moser, S. Biswal, J. Nees, A. Braun, G. A. Mourou, I. Johannsen, A. Giesen, W. Seeber, and U. Keller, �??Ultrafast ytterbium-doped bulk lasers and laser amplifiers,�?? Appl. Phys. B 69, 3-17 (1999).
[CrossRef]

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, "CW laser performance of Yb and Er,Yb doped tungstates," Appl. Phys. B 64, 409-413 (1997).
[CrossRef]

G. Paunescu, J. Hein, and R. Sauerbrey, �??100-fs diode-pumped Yb:KGW mode-locked laser,�?? Appl. Phys. B 79, 555-558 (2004).
[CrossRef]

Appl. Phys. Lett. (1)

A. Garnache, S. Hoogland, A. C. Tropper, I. Sagnes, G. Saint-Girons, and J. S. Roberts, �??Sub-500-fs soliton-like pulse in a passively mode-locked broadband surface-emitting laser with 100 mW average power,�?? Appl. Phys. Lett. 80, 3892-2894 (2002).
[CrossRef]

IEEE J. Quantum Electron. (1)

X. Mateos, V. Petrov, M. Aguiló, R. Solé, J. Gavaldà, J. Massons, F. Díaz, and U. Griebner, �??Continuous-wave laser oscillation of Yb3+ in monoclinic KLu(WO4)2,�?? IEEE J. Quantum Electron. 40, 1056-1059 (2004).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

W. F. Krupke, �??Ytterbium solid-state lasers �?? the first decade,�?? IEEE J. Sel. Top. Quantum Electron. 6, 1287-1296 (2000).
[CrossRef]

J. Opt. Soc. Am. B (1)

Jpn. J. Appl. Phys. (1)

A. A. Kaminskii, K. Ueda, H. E. Eichler, J. Findeisen, S. N. Bagaev, F. A. Kuznetsov, A. A. Pavlyuk, G. Boulon, and F. Bourgeois, �??Monoclinic tungstates KDy(WO4)2 and KLu(WO4)2 �?? new �?(3)-active crystals for laser Raman shifters,�?? Jpn. J. Appl. Phys. 37, L923-L926 (1998).
[CrossRef]

Opt. Exp. (2)

P. Klopp, V. Petrov, U. Griebner, and G. Erbert, "Passively mode-locked Yb:KYW laser pumped by a tapered diode laser," Opt. Exp. 10, 108-113 (2002).

F. Druon, F. Balembois, and P. Georges, �??Ultra-short-pulses and highly-efficient diode-pumped Yb:SYS mode-locked oscillators,�?? Opt. Exp. 12, 5005-5012 (2004).
[CrossRef]

Opt. Lett. (5)

Opt. Mat. (1)

X. Mateos, R. Solé, Jna. Gavaldà, M. Aguiló, J. Massons, F. Díaz, V. Petrov, and U. Griebner, "Crystal growth, spectroscopic studies and laser operation of Yb-doped potassium lutetium tungstate,�?? Opt. Mat., in press.

Phys. Rev. B (1)

M. C. Pujol, M. A. Bursukova, F. Güell, X. Mateos, R. Sole, J. Gavalda, M. Aguilo, J. Massons, F. Diaz, P. Klopp, U. Griebner, and V. Petrov, "Growth, optical characterization and laser operation of a stoichiometric crystal KYb(WO4)2,�?? Phys. Rev. B 65, 165121:1-11 (2002).
[CrossRef]

Sov. Phys. Dokl. (1)

P. V. Klevtsov and L. P. Kozeeva, "Synthesis and X-ray and thermal studies of potassium rare-earth tungstates, KLn(WO4)2, Ln=rare-earth element," Sov. Phys. Dokl. 4, 185-187 (1969) [transl. from Dokl. Akad. Nauk SSSR 185, 571-574 (1968)].

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Figures (5)

Fig. 1.
Fig. 1.

Gain cross section σ gain for polarization along the Np - and Nm -crystallo-optic axes of Yb:KLuW and different population inversion β. Note that the Ng -polarization is unfavourable because of the small cross sections.

Fig. 2.
Fig. 2.

Setup of the mode-locked Yb:KLu(WO4)2 laser: SAM - saturable absorber mirror; M1 -focusing mirror; M2, M3 - folding mirrors, P1, P2 - SF10 Brewster prisms; M4, M5 - output couplers (OC=1 to 5%), LP - f=6.28 cm focusing lens.

Fig. 3.
Fig. 3.

Autocorrelation trace and spectrum (inset) of the Yb:KLu(WO4)2 laser in the picosecond regime (Ti:sapphire laser pumping).

Fig. 4.
Fig. 4.

Autocorrelation traces and spectra (insets) of the femtosecond Yb:KLu(WO4)2 laser: (a) Nm -oriention, Ti:sapphire laser pumping; (b) Np -orientation, diode pumping.

Fig. 5.
Fig. 5.

Comparison of the femtosecond Yb:KLu(WO4)2 laser performance (average power vs. pulse duration) for polarization oriented parallel to the Np - and Nm -crystallo-optic axes.

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