Abstract

We performed laboratory and numerical modeling studies of an optical parametric oscillator with 90° intracavity image rotation. We found that the signal beam was more symmetric than that from comparable cavities without image rotation, and it had low values of the beam quality factor, M2. Oscillator performance agreed well with our numerical model.

© 2002 Optical Society of America

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References

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  1. A. V. Smith and M. S. Bowers, “Image-rotating cavity designs for improved beam quality in nanosecond optical parametric oscillators,” J. Opt. Soc. Am. B 18, 706–713 (2001).
    [CrossRef]
  2. A. V. Smith, W. J. Alford, T. D. Raymond, and M. S. Bowers, “Comparison of a numerical model with measured performance of a seeded, nanosecond KTP optical parametric oscillator,” J. Opt. Soc. Am. B 12, 2253–2267 (1995).
    [CrossRef]
  3. A. E. Siegman, “Defining the effective radius of curvature for a nonideal optical beam,” IEEE J. Quantum Electron. 27, 1146–1148 (1991).
    [CrossRef]
  4. T. F. Johnston, “Beam propagation M2 measurement made as easy as it gets: the four-cuts method,” Appl. Opt. 37, 4840–4850 (1998).
    [CrossRef]

2001 (1)

1998 (1)

1995 (1)

1991 (1)

A. E. Siegman, “Defining the effective radius of curvature for a nonideal optical beam,” IEEE J. Quantum Electron. 27, 1146–1148 (1991).
[CrossRef]

Alford, W. J.

Bowers, M. S.

Johnston, T. F.

Raymond, T. D.

Siegman, A. E.

A. E. Siegman, “Defining the effective radius of curvature for a nonideal optical beam,” IEEE J. Quantum Electron. 27, 1146–1148 (1991).
[CrossRef]

Smith, A. V.

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Figures (4)

Fig. 1
Fig. 1

Image-rotating cavity. Signal walk-off in the KTP crystal is in the cavity plane. The Dove prism is rotated 45° from the plane of the mirrors. Half-wave plates rotate the polarization of the signal to p polarization of the Dove prism.

Fig. 2
Fig. 2

Far-field signal-fluence profiles (a) without and (b) with the Dove prism, at a pump fluence of 4× threshold. The profiles are averages of ten pulses with the background subtracted.

Fig. 3
Fig. 3

Mw2, Mp2, and signal energy for rotated and nonrotated OPOs as a function of pump energy. Solid curves, calculated M2; boxes, measured M2. Mp2 and Mw2 are nearly equal for the image-rotated OPO. Dashed–dotted curves, calculated signal energies.

Fig. 4
Fig. 4

Calculated and measured Mw2 as functions of pump-beam displacement in the walk-off plane for the image-rotated OPO. The pump fluence is 4× threshold.

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