Abstract

A broadly tunable femtosecond optical parametric oscillator (OPO) based on KTiOPO4 that is externally pumped by a self-mode-locked Ti:sapphire laser is described. Continuous tuning is demonstrated from 1.22 to 1.37 μm in the signal branch and from 1.82 to 2.15 μm in the idler branch by using one set of OPO optics. The potential tuning range of the OPO is from 1.0 to 2.75 μm and requires three sets of mirrors and two crystals. Without prisms in the OPO cavity, 340 mW (475 mW) of chirped-pulse power is generated in the signal (idler) branch for 2.5 W of pump power. The total conversion efficiency as measured by the pump depletion is 55%. With prisms in the cavity, pulses of 135 fs are generated, which can be shortened to 75 fs by increasing the output coupling.

© 1992 Optical Society of America

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References

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  1. D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
    [CrossRef]
  2. E. S. Wachman, D. C. Edelstein, C. L. Tang, Opt. Lett. 15, 136 (1990).
    [CrossRef] [PubMed]
  3. E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
    [CrossRef]
  4. R. Laenen, H. Graener, A. Laubereau, Opt. Lett. 15, 971 (1990).
    [CrossRef] [PubMed]
  5. G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
    [CrossRef]
  6. See, for example, D. E. Spence, P. N. Kean, W. Sibbett, Opt. Lett. 16, 42 (1991).
    [CrossRef] [PubMed]
  7. The non-phase-matched process was previously observed by D. C. Edelstein, Ph.D. dissertation (Cornell University, Ithaca, NY., 1990).
  8. E. M. Wright, J. Opt. Soc. Am. B 7, 1142 (1990).
    [CrossRef]
  9. E. C. Cheung, J. M. Liu, J. Opt. Soc. Am. B 7, 1385 (1990).
    [CrossRef]

1992 (1)

G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
[CrossRef]

1991 (2)

See, for example, D. E. Spence, P. N. Kean, W. Sibbett, Opt. Lett. 16, 42 (1991).
[CrossRef] [PubMed]

E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
[CrossRef]

1990 (4)

1989 (1)

D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
[CrossRef]

Cheung, E. C.

Edelstein, D. C.

E. S. Wachman, D. C. Edelstein, C. L. Tang, Opt. Lett. 15, 136 (1990).
[CrossRef] [PubMed]

D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
[CrossRef]

The non-phase-matched process was previously observed by D. C. Edelstein, Ph.D. dissertation (Cornell University, Ithaca, NY., 1990).

Fu, Q.

G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
[CrossRef]

Graener, H.

Kean, P. N.

Laenen, R.

Laubereau, A.

Liu, J. M.

Mak, G.

G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
[CrossRef]

Pelouch, W. S.

E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
[CrossRef]

Sibbett, W.

Spence, D. E.

Tang, C. L.

E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
[CrossRef]

E. S. Wachman, D. C. Edelstein, C. L. Tang, Opt. Lett. 15, 136 (1990).
[CrossRef] [PubMed]

D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
[CrossRef]

van Driel, H. M.

G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
[CrossRef]

Wachman, E. S.

E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
[CrossRef]

E. S. Wachman, D. C. Edelstein, C. L. Tang, Opt. Lett. 15, 136 (1990).
[CrossRef] [PubMed]

D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
[CrossRef]

Wright, E. M.

Appl. Phys. Lett. (2)

D. C. Edelstein, E. S. Wachman, C. L. Tang, Appl. Phys. Lett. 54, 1728 (1989).
[CrossRef]

G. Mak, Q. Fu, H. M. van Driel, Appl. Phys. Lett. 60, 542 (1992).
[CrossRef]

J. Appl. Phys. (1)

E. S. Wachman, W. S. Pelouch, C. L. Tang, J. Appl. Phys. 70, 1893 (1991).
[CrossRef]

J. Opt. Soc. Am. B (2)

Opt. Lett. (3)

Other (1)

The non-phase-matched process was previously observed by D. C. Edelstein, Ph.D. dissertation (Cornell University, Ithaca, NY., 1990).

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Figures (3)

Fig. 1
Fig. 1

Schematic of the OPO cavity in the vertical plane. The Ti:sapphire pump (P) is focused onto the 1.15-mm KTP crystal. An enlarged view of the crystal is depicted above and shows the orientation for type II phase matching at the phase-matching angle θPM. The signal branch (S) is resonated by using a 1% output coupler and a piezoelectric transducer (PZT) for fine length adjustment. The idler (I) exits from the crystal at ~6 deg from the signal. The prism sequence may be raised to allow oscillation without the prisms.

Fig. 2
Fig. 2

(a) Spectrum and (b) autocorrelation of the signal pulse for net negative GVD. The time–bandwidth product is 0.45. (c) Spectrum and (d) autocorrelation of the chirped signal pulse for net positive GVD. The abrupt transition between these two regimes suggests a self-phase-modulation process in the crystal.

Fig. 3
Fig. 3

OPO signal (bottom) and idler (top) spectra obtained by angle tuning the OPO over a range of one set of mirrors. Broad tuning may also be achieved by changing the pump wavelength without rotating the KTP crystal or altering the OPO alignment.

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