Abstract

We report a technique for injection-seeding optical parametric generation (OPG) in periodically poled lithium niobate in which the wavelength of the seed is neither that of the signal nor of the idler waves; instead, it is the wavelength resulting from the sum-frequency mixing of the pump and signal waves. We show that pulsed OPG can be appropriately seeded in this way even if the sum-frequency process is not quasi-phase-matched if a pulsed laser is used as a seed, and if it is quasi-phase-matched even a low power (15 mW) HeNe beam can substantially reduce the bandwidth of the generated signal wave.

© 2002 Optical Society of America

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References

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J. Modern Opt. (1)

O. V. Checkhlov, J. A. J. Fitzpatrick, K. N. Rosser, C. M. Western, S. H. Ashworth, �??An all solid-state narrow bandwidth optical parametric oscillator and its applications to the high resolution spectroscopy of free radicals,�?? J. Modern Opt. 49, 865-876 (2002).
[CrossRef]

J. Opt. Soc. Am. B (3)

J. Phys. D: Appl. Phys (1)

M. Houé and P. D. Townsend, �??An introduction to methods of periodic poling for second-harmonic generation,�?? J. Phys. D: Appl. Phys 28, 1747-1763 (1995).
[CrossRef]

Opt. Commun. (3)

M. J. T. Milton, T. D. Gardiner, F. Molero, J. Galech, �??Injection-seeded optical parametric oscillator for range-resolved DIAL measurements of atmospheric methane,�?? Opt. Commun. 142, 153 (1997).
[CrossRef]

Teunis W. Tukker, Cees Otto, Jan Greve, �??A narrow-bandwidth optical parametric oscillator,�?? Opt. Commun. 154, 83-86 (1998).
[CrossRef]

S. Haidar, H. Ito, �??Injection-seeded optical parametric oscillator for efficient difference frequency generation in mid-IR,�?? Opt. Commun. 171, 171-176 (1999).
[CrossRef]

Opt. Express (1)

Opt. Lett. (3)

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Figures (6)

Fig 1.
Fig 1.

Experimental setup. For the non-quasi-phase-matched indirect seed experiments a pulsed, tunable Rhodamine 6G dye laser was used as the seed and a 20 mm long, Λ = 28.5 µm as the nonlinear crystal, and for the quasi-phase-matched indirect seed experiments a 15 mW HeNe was used as the seed and a Λ1 = 11.5 µm, Λ2 = 29.9 µm as the nonlinear crystal.

Fig. 2.
Fig. 2.

Indirect seeding without quasi-phase-matching. a) Spectra of the tunable indirect seed. b) Spectra of the corresponding (color-coded) signal beams. The black curve is the spectrum of the signal obtained without the indirect seed beam..

Fig. 3.
Fig. 3.

Spectra of the signal beam at 83.5 °C, 86.2 °C, and 90.5 °C. The seed beam is blocked.

Fig. 4.
Fig. 4.

Indirect seeding with quasi-phase-matching. T= 86.2°C. Incident indirect seed power: 15mW.

Fig. 5.
Fig. 5.

Output signal energy vs. incident pump energy.

Fig. 6.
Fig. 6.

Normalized spectra of the indirectly-seeded signal beam at different pump energies. Resolution of the spectrum analyzer: 0.1 nm. T=86.2 °C. Incident indirect seed power: 15mW. The fine structure below this resolution limit is an artifact due to pulse-to-pulse fluctuations of the pump beam energy.

Equations (4)

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1 λ p = 1 λ s + 1 λ i
n p λ p = n s λ s + n i λ i ± 2 π Λ ,
1 λ m = 1 λ s + 1 λ p .
Δ λ s λ s 2 λ p 2 Δ λ p .

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