Abstract

We propose and demonstrate a novel hybrid seeded optical parametric amplifier (OPA) that incorporates an external CW seeding at signal wavelength in the first stage and difference-frequency mixing between the idler and pump in the second stage. By using a germanium plate to block the CW seeding background, spectrally and temporally clean signal pulses with duration less than 150 fs and energy up to 17 μJ are obtained with a MgO:LiNbO3-based hybrid seeded OPA. The device may provide direct tunability to some extent and delivers signal pulses tunable from 1.01 μm to 1.08 μm.

© 2005 Optical Society of America

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References

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Appl. Opt. (1)

Appl. Phys. Lett. (1)

G. Cerullo, M. Nisoli, and S. De Silvestri, "Generation of 11 fs pulses tunable across the visible by optical parametric amplification," Appl. Phys. Lett. 71, 3616-3618 (1997).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (2)

T. Kobayashi, A. Shirakawa, and T. Fuji, "Sub-5-fs transform-limited visible pulse source and its application to real-time spectroscopy," IEEE J. Sel. Top. Quantum Electron. 7, 525-538 (2001).
[CrossRef]

G. M. Gale, F. Hache, and M. Cavallari, "Broad-bandwidth parametric amplification in the visible: femtosecond experiments and simulations," IEEE J. Sel. Top. Quantum Electron. 4, 224-229 (1998).
[CrossRef]

J. Korean Phys. Soc. (1)

L. J. Qian, H. Y. Zhu, H. Luo, P. Yuan, T. Wang, G. Xu, and X. Q. Fu, "Quadratic nonlinear technologies for femtosecond lasers," J. Korean Phys. Soc. 46, S233-S241 (2005).

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

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

R. Danielius, A. Piskarskas, A. Stabinis, G. P. Banfi, P. Ditrapani, and R. Righini, "Traveling-wave parametric generation of widely tunable, highly coherent femtosecond light pulses," J. Opt. Soc. Am. B - Opt. Phys. 10, 2222-2232 (1993).
[CrossRef]

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

F. Rotermund, V. Petrov, F. Noack, M. Wittmann, and G. Korn, "Laser-diode-seeded operation of a femtosecond optical parametric amplifier with MgO : LiNbO3 and generation of 5-cycle pulses near 3 μm," J. Opt. Soc. Am. B. 16, 1539-1545 (1999).
[CrossRef]

Opt. Lett. (4)

Rev. Sci. Instrum. (1)

G. Cerullo, and S. De Silvestri, "Ultrafast optical parametric amplifiers," Rev. Sci. Instrum. 74, 1-18 (2003).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Schematic of the hybrid seeded femtosecond OPA. BS, beam splitter; DM1–DM2, dichroic mirrors for 800 nm and 1μm; DM3, dichroic mirror for 800 nm and 3.5 μm; LN, MgO:LiNbO3 crystal; DL, optical delay line; Ge, germanium plate; and all unmarked, silver mirrors.

Fig. 2.
Fig. 2.

Typical signal spectra from the conventional (a-c) and hybrid (d-f) seeded OPAs. The spectra were measured at three different orientations of the crystals, and the adjusting angle for each was ~1 mrad (external). The narrow peaks in (a-c) indicate the seeding wavelength at 1064 nm.

Fig. 3.
Fig. 3.

Typical autocorrelation traces of the signal pulses at 1045 nm: (a) conventional seeded OPA, and (b) hybrid seeded OPA. Insets: the corresponding spectra.

Fig. 4.
Fig. 4.

Pulse energy at 1045 nm vs. seeding power. Open square: conventional seeded OPA; solid circle: hybrid seeded OPA.

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