Abstract

We demonstrate a power-scalable Kerr-lens mode-locked Yb:YAG thin-disk oscillator. It delivers 200 fs pulses at an average power of 17 W and a repetition rate of 40 MHz. At an increased (180 W) pump power level, the laser produces 270 fs 1.1 μJ pulses at an average power of 45 W (optical-to-optical efficiency of 25%). Semiconductor-saturable-absorber-mirror-assisted Kerr-lens mode locking (KLM) and pure KLM with a hard aperture show similar performance. To our knowledge, these are the shortest pulses achieved from a mode-locked Yb:YAG disk oscillator and this is the first demonstration of a Kerr-lens mode-locked thin-disk laser.

© 2011 Optical Society of America

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References

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  1. C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
    [CrossRef]
  2. D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .
  3. J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
    [CrossRef]
  4. C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
    [CrossRef]
  5. T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
    [CrossRef]
  6. S. Uemura and K. Torizuka, Jpn. J. Appl. Phys. 50, 010201 (2011).
    [CrossRef]
  7. T. Brabec, Ch. Spielmann, P. F. Curley, and F. Krausz, Opt. Lett. 17, 1292 (1992).
    [CrossRef]
  8. A. Stingl, M. Lenzner, Ch. Spielmann, F. Krausz, and R. Szipöcs, Opt. Lett. 20, 602 (1995).
    [CrossRef]
  9. V. Magni, J. Opt. Soc. Am. A 4, 1962 (1987).
    [CrossRef]
  10. V. Pervak, C. Teisset, A. Sugita, S. Naumov, F. Krausz, and A. Apolonski, Opt. Express 16, 10220 (2008).
    [CrossRef]
  11. B. Henrich and R. Beigang, Opt. Commun. 135, 300 (1997).
    [CrossRef]
  12. O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.
  13. R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
    [CrossRef]
  14. C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
    [CrossRef]
  15. M. Tokurakawa, A. Shirakawa, K. Ueda, H. Yagi, S. Hosokawa, T. Yanagitani, and A. A. Kaminskii, Opt. Lett. 33, 1380 (2008).
    [CrossRef]
  16. H. Sutter, G. Steinmeyer, L. Gallmann, N. Matuschek, F. Morier-Genoud, U. Keller, V. Scheuer, G. Angelow, and T. Tschudi, Opt. Lett. 24, 631 (1999).
    [CrossRef]
  17. V. L. Kalashnikov is preparing a manuscript to be called “Energy scalability of solid-state oscillators: general rules and prospects.”

2011 (3)

C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
[CrossRef]

S. Uemura and K. Torizuka, Jpn. J. Appl. Phys. 50, 010201 (2011).
[CrossRef]

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

2010 (1)

2009 (1)

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

2008 (3)

2005 (1)

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

1999 (1)

1997 (1)

B. Henrich and R. Beigang, Opt. Commun. 135, 300 (1997).
[CrossRef]

1995 (1)

1992 (1)

1987 (1)

Angelow, G.

Apolonski, A.

V. Pervak, C. Teisset, A. Sugita, S. Naumov, F. Krausz, and A. Apolonski, Opt. Express 16, 10220 (2008).
[CrossRef]

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Baer, C. R.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

Baer, C. R. E.

Bauer, D.

J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
[CrossRef]

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Beigang, R.

B. Henrich and R. Beigang, Opt. Commun. 135, 300 (1997).
[CrossRef]

Beil, K.

Brabec, T.

Curley, P. F.

Dekorsy, T.

J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
[CrossRef]

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Fill, E.

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Gallmann, L.

Golling, M.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
[CrossRef]

C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
[CrossRef]

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Grange, R.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Guina, M.

Haiml, M.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Heckl, O. H.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
[CrossRef]

C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
[CrossRef]

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

Henrich, B.

B. Henrich and R. Beigang, Opt. Commun. 135, 300 (1997).
[CrossRef]

Hoffmann, M.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

Hosokawa, S.

Huber, G.

Huberund, G.

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

Kalashnikov, V.

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Kalashnikov, V. L.

V. L. Kalashnikov is preparing a manuscript to be called “Energy scalability of solid-state oscillators: general rules and prospects.”

Kaminskii, A. A.

Keller, U.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
[CrossRef]

C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
[CrossRef]

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

H. Sutter, G. Steinmeyer, L. Gallmann, N. Matuschek, F. Morier-Genoud, U. Keller, V. Scheuer, G. Angelow, and T. Tschudi, Opt. Lett. 24, 631 (1999).
[CrossRef]

Killi, A.

J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
[CrossRef]

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Kleinbauer, J.

J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
[CrossRef]

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Krainer, L.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Kränkel, C.

Krausz, F.

V. Pervak, C. Teisset, A. Sugita, S. Naumov, F. Krausz, and A. Apolonski, Opt. Express 16, 10220 (2008).
[CrossRef]

A. Stingl, M. Lenzner, Ch. Spielmann, F. Krausz, and R. Szipöcs, Opt. Lett. 20, 602 (1995).
[CrossRef]

T. Brabec, Ch. Spielmann, P. F. Curley, and F. Krausz, Opt. Lett. 17, 1292 (1992).
[CrossRef]

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Kumkar, M.

Larionov, M.

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Lenzner, M.

Magni, V.

Mangold, M.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

Matuschek, N.

Morier-Genoud, F.

Naumov, S.

Neuhaus, J.

Ostinelli, O.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Paschotta, R.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Pervak, V.

V. Pervak, C. Teisset, A. Sugita, S. Naumov, F. Krausz, and A. Apolonski, Opt. Express 16, 10220 (2008).
[CrossRef]

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Petermann, K.

Peters, R.

C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
[CrossRef]

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

Pronin, O.

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Rauschenberger, J.

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Saraceno, C. J.

C. J. Saraceno, O. H. Heckl, C. R. E. Baer, M. Golling, T. Südmeyer, K. Beil, C. Kränkel, K. Petermann, G. Huber, and U. Keller, Opt. Express 19, 20288 (2011).
[CrossRef]

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

C. R. E. Baer, C. Kränkel, C. J. Saraceno, O. H. Heckl, M. Golling, R. Peters, K. Petermann, T. Südmeyer, G. Huber, and U. Keller, Opt. Lett. 35, 2302 (2010).
[CrossRef]

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

Schättiger, F.

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Scheuer, V.

Schriber, C.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

Shirakawa, A.

Spielmann, Ch.

Spühler, G. J.

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

Steinmeyer, G.

Stingl, A.

Sudmeyer, T.

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

Südmeyer, T.

Sugita, A.

Sutter, D. H.

J. Neuhaus, D. Bauer, J. Zhang, A. Killi, J. Kleinbauer, M. Kumkar, S. Weiler, M. Guina, D. H. Sutter, and T. Dekorsy, Opt. Express 16, 20530 (2008).
[CrossRef]

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

Sutter, H.

Szipöcs, R.

Teisset, C.

V. Pervak, C. Teisset, A. Sugita, S. Naumov, F. Krausz, and A. Apolonski, Opt. Express 16, 10220 (2008).
[CrossRef]

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

Tokurakawa, M.

Torizuka, K.

S. Uemura and K. Torizuka, Jpn. J. Appl. Phys. 50, 010201 (2011).
[CrossRef]

Tschudi, T.

Ueda, K.

Uemura, S.

S. Uemura and K. Torizuka, Jpn. J. Appl. Phys. 50, 010201 (2011).
[CrossRef]

Weiler, S.

Yagi, H.

Yanagitani, T.

Zhang, J.

Appl. Phys. B (2)

T. Südmeyer, C. Kränkel, C. R. E. Baer, O. H. Heckl, C. J. Saraceno, M. Golling, R. Peters, K. Petermann, G. Huberund, and U. Keller, Appl. Phys. B 97, 281 (2009).
[CrossRef]

R. Grange, M. Haiml, R. Paschotta, G. J. Spühler, L. Krainer, O. Ostinelli, M. Golling, and U. Keller, Appl. Phys. B 80, 151 (2005).
[CrossRef]

IEEE J. Quantum Electron. (1)

C. J. Saraceno, C. Schriber, M. Mangold, M. Hoffmann, O. H. Heckl, C. R. Baer, M. Golling, T. Sudmeyer, and U. Keller, IEEE J. Quantum Electron. PP, 1 (2011).
[CrossRef]

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

Jpn. J. Appl. Phys. (1)

S. Uemura and K. Torizuka, Jpn. J. Appl. Phys. 50, 010201 (2011).
[CrossRef]

Opt. Commun. (1)

B. Henrich and R. Beigang, Opt. Commun. 135, 300 (1997).
[CrossRef]

Opt. Express (3)

Opt. Lett. (5)

Other (3)

V. L. Kalashnikov is preparing a manuscript to be called “Energy scalability of solid-state oscillators: general rules and prospects.”

O. Pronin, V. Kalashnikov, V. Pervak, C. Teisset, M. Larionov, J. Rauschenberger, A. Apolonski, E. Fill, and F. Krausz, in CLEO/Europe and EQEC 2011 Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CA11_5.

D. Bauer, F. Schättiger, J. Kleinbauer, D. H. Sutter, A. Killi, and T. Dekorsy, in Advanced Solid-State Photonics, OSA Technical Digest (CD) (Optical Society of America, 2011), paper ATuC2 .

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Figures (3)

Fig. 1.
Fig. 1.

Emission spectrum of Yb:YAG gain medium. The shaded areas show the spectra (FWHM) generated in the present work and in [6].

Fig. 2.
Fig. 2.

(a) Schematic of the Kerr-lens mode-locked Yb:YAG disk oscillator. All flat mirrors except for M are high-dispersion mirrors with 1200fs2 per bounce; OC, an output coupler with 5.5% or 14% transmission; R1 and R2, concave mirrors with 0.3 m radius of curvature; R3, 4m; R4, 4 m; K, 1-mm-thick fused silica plate placed in the focus at the Brewster angle; H, hard aperture (a pinhole); M, flat mirror or SESAM. The pulse repetition rate is 40 MHz. The oscillator is placed inside a box of size 1m×0.4m. (b) Beam profile in mode-locked regime and in CW regime (after mode locking has been interrupted).

Fig. 3.
Fig. 3.

Autocorrelation and the spectrum (inset) at 17 W of output power and 5.5% output coupler (measured with an APE Pulse Check autocorrelator). The time–bandwidth product is 0.34 (sech2, ideal 0.315). Kelly sidebands are visible in the spectrum wings. This measurement was performed for the SESAM-assisted KLM.

Metrics