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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    [CrossRef]
  2. F. Druon, F. Balembois, P. Georges, A. Brun, A. Courjaud, C. Hönninger, F. Salin, A. Aron, F. Mougel, G. Aka, D. Vivien, �??Generation of 90-fs pulses from a mode-locked diode-pumped Yb3+:Ca4GdO(BO3)3 laser,�?? Opt. Lett. 25, 423-425 (2000).
    [CrossRef]
  3. F. Brunner, G.J. Spühler, J. Aus der Au, L. Krainer, F. Morier-Genoud, R. Paschotta, N. Lichtenstein, S. Weiss, C. Harder, A.A. Lagatsky, A. Abdolvand, N.V. Kuleshov, U. Keller, �??Diode-pumped femtosecond Yb:KGd(WO4)2 laser with 1.1-W average power,�?? Opt. Lett. 25, 1119-1121(2000).
    [CrossRef]
  4. F. Druon, S. Chénais, P. Raybaut, F. Balembois, P. Georges, R. Gaumé, G. Aka, B. Viana, S. Mohr, D. Kopf, �??Diode-pumped Yb:Sr3Y(BO3)3 femtosecond laser,�?? Opt. Lett. 27, 197-199 (2002).
    [CrossRef]
  5. M. J. Lederer, M. Hildebrandt, V. Z. Kolev, B. Luther-Davies, B. Taylor, J. Dawes, P. Dekker, J. Piper, H.H. Tan, C. Jagadish, �??Passive mode locking of a self-frequency-doubling Yb:YAl3(BO3)4 laser,�?? Opt. Lett. 27, 436-438 (2002).
    [CrossRef]
  6. P. Klopp, V. Petrov, U. Griebner, K. Petermann, V. Peters, G. Erbert, �??Highly efficient mode-locked Yb:Sc2O3 laser,�?? Opt. Lett. 15, 391-393 (2004).
    [CrossRef]
  7. N.V. Kuleshov, A.A. Lagatsky, V.G. Shcherbitsky, V.P. Mikhailov, E. Heumann, T.Jensen, A. Diening, G. Huber, �??CW laser performance of Yb and Er, Yb doped tungstates,�?? Appl. Phys. B 64, 409-411 (1997).
    [CrossRef]
  8. N.V. Kuleshov, A.A. Lagatsky, A.V. Podlipensky, V.P. Mikhailov, G. Huber, �??Pulsed laser operation of Ybdoped KY(WO4)2 and KGd(WO4)2,�?? Opt. Lett. 22, 1317-1319 (1997).
    [CrossRef]
  9. P. Klopp, V.Petrov, U. Griebner, G. Erbert, �??Passively mode-locked Yb:KYW laser pumped by a tapered diode laser,�?? Opt. Express 10, 108-113 (2002).
    [CrossRef] [PubMed]
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    [CrossRef]
  11. A.A. Lagatsky, E.U. Rafailov, C.G. Leburn, C.T.A. Brown, N. Xiang, O.G. Okhotnikov, W. Sibbett, �??Highly efficient femtosecond Yb:KYW laser pumped by single narrow-stripe laser diode,�?? Electron. Lett. 39, 1108-1110 (2003).
    [CrossRef]
  12. M. Ramaswamy-Paye, J.G. Fujimoto, �??Compact dispersion-compensating geometry for Kerr-lens modelocked femtosecond lasers,�?? Opt. Lett. 19, 1756-1758 (1994).
    [CrossRef] [PubMed]
  13. K.V. Yumashev, N.N. Posnov, P.V. Prokoshin, V.L. Kalashnikov, F. Mejid, I.G. Poloyko, V.P. Mikhailov, V.P. Kozich, �??Z-scan measurements of nonlinear refraction and Kerr-lens mode-locking with Yb3+:KY(WO4)2,�?? Opt. Quantum Electron. 32, 43-48 (2000).
    [CrossRef]
  14. H. Liu, J. Nees, and G. Mourou, �??Diode-pumped Kerr-lens mode-locked Yb:KY(WO4)2 laser,�?? Opt. Lett. 26, 1723-1725 (2001).
    [CrossRef]
  15. A. Major, I. Nikolakakos, J.S. Aitchison, A.I. Ferguson, N. Langford, P.W.E. Smith, �??Characterisation of the nonlinear refractive index of the laser crystal Yb:KGd(WO4)2�??, Appl. Phys. B 77, 433-436 (2003).
    [CrossRef]

Appl. Phys. B

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, 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, G. Huber, �??CW laser performance of Yb and Er, Yb doped tungstates,�?? Appl. Phys. B 64, 409-411 (1997).
[CrossRef]

A. Major, I. Nikolakakos, J.S. Aitchison, A.I. Ferguson, N. Langford, P.W.E. Smith, �??Characterisation of the nonlinear refractive index of the laser crystal Yb:KGd(WO4)2�??, Appl. Phys. B 77, 433-436 (2003).
[CrossRef]

Electron. Lett.

A.A. Lagatsky, E.U. Rafailov, C.G. Leburn, C.T.A. Brown, N. Xiang, O.G. Okhotnikov, W. Sibbett, �??Highly efficient femtosecond Yb:KYW laser pumped by single narrow-stripe laser diode,�?? Electron. Lett. 39, 1108-1110 (2003).
[CrossRef]

Opt. Express

Opt. Lett.

F. Brunner, T. Südmeyer, E. Innerhofer, F. Morier-Genoud, R. Paschotta, V.E. Kisel, V.G. Shcherbitsky, N.V. Kuleshov, J. Gao, K. Contag, A. Giesen, U. Keller, �??240-fs pulses with 22-W average power from a modelocked thin-disk Yb:KY(WO4)2 laser,�?? Opt. Lett. 27, 1162-1164 (2002).
[CrossRef]

N.V. Kuleshov, A.A. Lagatsky, A.V. Podlipensky, V.P. Mikhailov, G. Huber, �??Pulsed laser operation of Ybdoped KY(WO4)2 and KGd(WO4)2,�?? Opt. Lett. 22, 1317-1319 (1997).
[CrossRef]

F. Druon, F. Balembois, P. Georges, A. Brun, A. Courjaud, C. Hönninger, F. Salin, A. Aron, F. Mougel, G. Aka, D. Vivien, �??Generation of 90-fs pulses from a mode-locked diode-pumped Yb3+:Ca4GdO(BO3)3 laser,�?? Opt. Lett. 25, 423-425 (2000).
[CrossRef]

F. Brunner, G.J. Spühler, J. Aus der Au, L. Krainer, F. Morier-Genoud, R. Paschotta, N. Lichtenstein, S. Weiss, C. Harder, A.A. Lagatsky, A. Abdolvand, N.V. Kuleshov, U. Keller, �??Diode-pumped femtosecond Yb:KGd(WO4)2 laser with 1.1-W average power,�?? Opt. Lett. 25, 1119-1121(2000).
[CrossRef]

F. Druon, S. Chénais, P. Raybaut, F. Balembois, P. Georges, R. Gaumé, G. Aka, B. Viana, S. Mohr, D. Kopf, �??Diode-pumped Yb:Sr3Y(BO3)3 femtosecond laser,�?? Opt. Lett. 27, 197-199 (2002).
[CrossRef]

M. J. Lederer, M. Hildebrandt, V. Z. Kolev, B. Luther-Davies, B. Taylor, J. Dawes, P. Dekker, J. Piper, H.H. Tan, C. Jagadish, �??Passive mode locking of a self-frequency-doubling Yb:YAl3(BO3)4 laser,�?? Opt. Lett. 27, 436-438 (2002).
[CrossRef]

P. Klopp, V. Petrov, U. Griebner, K. Petermann, V. Peters, G. Erbert, �??Highly efficient mode-locked Yb:Sc2O3 laser,�?? Opt. Lett. 15, 391-393 (2004).
[CrossRef]

M. Ramaswamy-Paye, J.G. Fujimoto, �??Compact dispersion-compensating geometry for Kerr-lens modelocked femtosecond lasers,�?? Opt. Lett. 19, 1756-1758 (1994).
[CrossRef] [PubMed]

H. Liu, J. Nees, and G. Mourou, �??Diode-pumped Kerr-lens mode-locked Yb:KY(WO4)2 laser,�?? Opt. Lett. 26, 1723-1725 (2001).
[CrossRef]

Opt. Quantum Electron.

K.V. Yumashev, N.N. Posnov, P.V. Prokoshin, V.L. Kalashnikov, F. Mejid, I.G. Poloyko, V.P. Mikhailov, V.P. Kozich, �??Z-scan measurements of nonlinear refraction and Kerr-lens mode-locking with Yb3+:KY(WO4)2,�?? Opt. Quantum Electron. 32, 43-48 (2000).
[CrossRef]

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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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