Abstract

We report in situ characterization of a semiconductor saturable absorber mirror (SESAM) in an operating Yb:KGW mode-locked laser. The technique may be described as a pump–probe experiment in which the intracavity beam acts as a pump beam while the output of the same laser is used as a test beam for the SESAM reflectivity. At zero delay, the probe pulse overlaps in time with the subsequent intracavity pulse. The method is an alternative to standard pump–probe measurements in situations where the intracavity parameters such as energy fluence onto the SESAM, pulse length, and center wavelength cannot be achieved simultaneously with available lasers.

© 2005 Optical Society of America

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  1. U. Keller, in Nonlinear Optics in Semiconductors, A. Kost and E. Garmire, eds. (Academic, 1998), pp. 211–286.
    [CrossRef]
  2. L. R. Brovelli, U. Keller, and T. H. Chiu, J. Opt. Soc. Am. B 12, 311 (1995).
    [CrossRef]
  3. O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
    [CrossRef]
  4. U. Keller, Nature 424, 831 (2003).
    [CrossRef] [PubMed]
  5. M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
    [CrossRef]
  6. P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
    [CrossRef]
  7. M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
    [CrossRef]

2004

O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
[CrossRef]

M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
[CrossRef]

2003

U. Keller, Nature 424, 831 (2003).
[CrossRef] [PubMed]

2001

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

1999

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

1995

Brovelli, L. R.

Chiu, T. H.

Grange, R.

M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
[CrossRef]

Grudinin, A.

O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
[CrossRef]

Haiml, M.

M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
[CrossRef]

Ippen, E. P.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Jagadish, C.

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Joschko, M.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Kärtner, F. X.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Keller, U.

M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
[CrossRef]

U. Keller, Nature 424, 831 (2003).
[CrossRef] [PubMed]

L. R. Brovelli, U. Keller, and T. H. Chiu, J. Opt. Soc. Am. B 12, 311 (1995).
[CrossRef]

U. Keller, in Nonlinear Optics in Semiconductors, A. Kost and E. Garmire, eds. (Academic, 1998), pp. 211–286.
[CrossRef]

Kolev, V.

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Kolodziejski, L. A.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Koontz, E. M.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Langlois, P.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Lederer, M. J.

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Luther-Davies, B.

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Okhotnikov, O.

O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
[CrossRef]

Pessa, M.

O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
[CrossRef]

Tan, H. H.

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Thoen, E. R.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

Appl. Phys. B

M. Haiml, R. Grange, and U. Keller, Appl. Phys. B 79, 331 (2004).
[CrossRef]

Appl. Phys. Lett.

P. Langlois, M. Joschko, E. R. Thoen, E. M. Koontz, F. X. Kärtner, E. P. Ippen, and L. A. Kolodziejski, Appl. Phys. Lett. 75, 3841 (1999).
[CrossRef]

J. Opt. Soc. Am. B

J. Phys. D

M. J. Lederer, V. Kolev, B. Luther-Davies, H. H. Tan, and C. Jagadish, J. Phys. D 34, 2455 (2001).
[CrossRef]

Nature

U. Keller, Nature 424, 831 (2003).
[CrossRef] [PubMed]

New J. Phys.

O. Okhotnikov, A. Grudinin, and M. Pessa, New J. Phys. 6, 177 (2004).
[CrossRef]

Other

U. Keller, in Nonlinear Optics in Semiconductors, A. Kost and E. Garmire, eds. (Academic, 1998), pp. 211–286.
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

(a) Yb:KGW laser cavity and (b) experimental setup for in situ characterization of the saturable absorber. M1–M3, curved mirrors; R, radius of curvature; M4, high-reflective plane mirror; OC, output coupler with 3% transmission; SESAM, saturable absorber mirror; M5–M7, plane mirrors; M8, curved mirror; CH, chopper; BS, beam splitter; L1–L3, lenses; NC, nonlinear crystal for SH generation; HP, half-wavelength plate used to adjust the SH intensity; DL, delay line; DA, DB, photodiodes; FA, FB neutral-density filters.

Fig. 2
Fig. 2

Differential reflectivity measurement at a pump fluence of 126 μ J cm 2 . Δ R R lin is plotted as a function of the delay between pump and probe pulses. The solid curve shows a double exponential fit, with a fast time constant of 370 fs and a slow time constant of 3.9 ps .

Fig. 3
Fig. 3

Nonlinear reflectivity R plotted as a function of the energy fluence on the saturable absorber. The solid curve shows the theoretical curve assuming a modulation depth of 0.91% and a saturation fluence of 14 μ J cm 2 .

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