Abstract

We report two cw, singly resonant optical parametric oscillator (OPO) configurations based on periodically poled lithium niobate that result in significantly higher efficiency and output power than in previous studies. Using four-mirror OPO cavities and pumping with a 1.064-μm Nd:YAG laser, we observe 93% pump depletion and obtain ∼86% of the converted pump photons as useful idler output. The single-beam, in-the-bucket idler output power of 3.55 W at 3.25 μm corresponds to ∼80% of quantum-limited performance. We measure and compare the amplitude noise and spectral bandwidth of the two configurations. We also demonstrate >1 W of tunable cw output over the 3.3–3.9-μm spectral range.

© 1996 Optical Society of America

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References

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  1. L. B. Kreuzer, in Proceedings of the Joint Conference on Lasers and Optoelectronics (Institution of Electronic and Radio Engineers, London, 1969), p. 53.
  2. S. E. Harris, Proc. IEEE 57, 2096 (1969).
    [CrossRef]
  3. W. R. Bosenberg, A. Drobshoff, J. I. Alexander, L. E. Myers, R. L. Byer, Opt. Lett. 21, 713 (1996).
    [CrossRef] [PubMed]
  4. L. E. Myers, R. C. Eckardt, M. M. Fejer, R. L. Byer, W. R. Bosenberg, J. W. Pierce, J. Opt. Soc. Am. B 12, 2102 (1995).
    [CrossRef]
  5. S. T. Yang, R. C. Eckardt, R. L. Byer, J. Opt. Soc. Am. B 10, 1684 (1993).
    [CrossRef]
  6. ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
    [CrossRef]
  7. We define the idler quantum slope efficiency as the slope of the idler-versus-pump-power curve multiplied by the ratio of the idler and the pump wavelengths.
  8. Percentage quantum-limited performance, (Piλi)/ (Pp/λp), where Pi is the measured idler power, Pp is the incident pump power, and λp and λi are the pump and the idler wavelengths. At 100% quantum-limited performance, Pi would equal 4.4 W for Pi = 13.5 W, λp = 1.064 μm, λi = 3.25 μm.
  9. L. E. Myers, R. C. Eckardt, M. M. Fejer, R. L. Byer, W. R. Bosenberg, Opt. Lett. 21, 594 (1996).
    [CrossRef]

1996 (2)

1995 (1)

1993 (1)

1982 (1)

ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
[CrossRef]

1969 (1)

S. E. Harris, Proc. IEEE 57, 2096 (1969).
[CrossRef]

Alexander, J. I.

Bosenberg, W. R.

Byer, R. L.

Drobshoff, A.

Eckardt, R. C.

Falk, J.

ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
[CrossRef]

Fejer, M. M.

Guha, S.

ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
[CrossRef]

Harris, S. E.

S. E. Harris, Proc. IEEE 57, 2096 (1969).
[CrossRef]

Kreuzer, L. B.

L. B. Kreuzer, in Proceedings of the Joint Conference on Lasers and Optoelectronics (Institution of Electronic and Radio Engineers, London, 1969), p. 53.

Myers, L. E.

Pierce, J. W.

Wu, F.J.

ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
[CrossRef]

Yang, S. T.

IEEE J. Quantum Electron. (1)

ξ = L/b, where L is the crystal length and b is the confocal parameter of the Gaussian beam. See S. Guha, F.J. Wu, J. Falk, IEEE J. Quantum Electron. 18, 907 (1982) for more detail.
[CrossRef]

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

Opt. Lett. (2)

Proc. IEEE (1)

S. E. Harris, Proc. IEEE 57, 2096 (1969).
[CrossRef]

Other (3)

L. B. Kreuzer, in Proceedings of the Joint Conference on Lasers and Optoelectronics (Institution of Electronic and Radio Engineers, London, 1969), p. 53.

We define the idler quantum slope efficiency as the slope of the idler-versus-pump-power curve multiplied by the ratio of the idler and the pump wavelengths.

Percentage quantum-limited performance, (Piλi)/ (Pp/λp), where Pi is the measured idler power, Pp is the incident pump power, and λp and λi are the pump and the idler wavelengths. At 100% quantum-limited performance, Pi would equal 4.4 W for Pi = 13.5 W, λp = 1.064 μm, λi = 3.25 μm.

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Figures (4)

Fig. 1
Fig. 1

Schematic of the two OPO cavities that we investigated: a, the four-mirror ring cavity; b, the four-mirror linear cavity. Both cavities use the same crystal and four-cavity optics. The two curved mirrors have 100-mm radii of curvature. The remaining two mirrors are flat. The PPLN crystal is 50 mm long and has a grating period of 29.75 μm for first-order, quasi-phase matching of 1.064-μm pump photons to 1.57-μm signal and 3.25-μm idler photons (crystal temperature is 180°C). Insertion of an intracavity etalon permits quasi-continuous tuning over ∼5 cm-1

Fig. 2
Fig. 2

Pump depletion and idler output versus pump input for the ring cavity operating at an idler wavelength of 3.25 μm. The oscillation threshold is 3.6 W. A maximum of 3.55 W is observed with a 13.5-W pump. The kink in the idler output curve is due to saturation of the pump depletion. At pumping levels higher than 2.4 times threshold, the pump depletion is ∼93%, and the measured idler power is ∼80% of the quantum-limited maximum output.

Fig. 3
Fig. 3

Pump depletion and idler output versus pump input for the linear cavity operating at an idler wavelength of 3.25 μm. The oscillation threshold is 6.0 W. A maximum power of 3.60 W is observed with a 13.5-W pump. The kink in the idler output curve at 2.2 times threshold is due to saturation of the pump depletion. The idler quantum slope efficiency at pump levels of <2.2 times threshold is ∼150%.

Fig. 4
Fig. 4

Idler output versus wavelength for a 25-mm-long multiple quasi-phase matching grating PPLN crystal.9 Translating the crystal produced idler wavelengths of 3.95–3.24 μm (see text). The tuning range was limited by the losses of the cavity mirror and crystal an-tireflection coatings. With optimized coatings, multiwatt idler output should be possible over the range of 2.3 to >4.2 μm.

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