Suppression of degenerate parametric processes limiting frequency-doubling efficiency of crystals

Volosov, V. D.; Kalintsev, A. G.; Krylov, V. N.

doi:10.1070/qe1976v006n10abeh011908

Cited by 10 publications

(6 citation statements)

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“…Because birefringent phase matching relies on the presence of both ordinary and extraordinary waves, walkoff is often a concern, particularly for smalldiameter beams, where it limits the length of beam overlap in the crystal and often limits conversion efficiency. This can be partially counteracted by pairs of crystals arranged in a walkoff-compensated orientation, [1][2][3][4][5][6][7][8][9][10][11] where the walkoff direction is reversed in the second crystal of each pair. This arrangement has the added advantage that the beams do not translate if the crystal angles are synchronously adjusted to tune the phase-matched wavelength.…”

Section: Introductionmentioning

confidence: 99%

Parametric amplification and oscillation with walkoff-compensating crystals

et al. 1997

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We measure and model parametric gain and oscillation for two crystals arranged for walkoff compensation. We show how the orientation of the crystals determines the relative sign of the nonlinear mixing coefficient in the two crystals. This sign dramatically influences small signal gain and oscillator performance, and we show how to determine the correct crystal orientation from parametric-gain measurements. The performance of two-crystal oscillators is examined with particular attention to beam tilts, conversion efficiency, and beam quality. We find reduced efficiency and increased oscillation threshold when the coefficients have opposite signs in a two-crystal ring oscillator. Sign reversal seems to have little influence on spectral purity or far-field beam profiles when the oscillator is seeded.

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Section: Introductionmentioning

confidence: 99%

Parametric amplification and oscillation with walkoff-compensating crystals

et al. 1997

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“…The theory behind the influence of the distance between the crystals in travelling wave multi-crystal set-ups has been reported in the literature previously [14,17]. This theory should hold for interactions inside the cavity.…”

Section: Resultsmentioning

confidence: 94%

“…Furthermore, Volosov et al [14] have also investigated the interaction of the relative nonlinearity sign in a twin-crystal set-up with dispersion in air. They show that these phenomena can produce very similar effects on the output beam.…”

Section: Introductionmentioning

confidence: 99%

Beam patterns in an optical parametric oscillator set-up employing walk-off compensating beta barium borate crystals

et al. 2013

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This paper describes the investigation of an optical parametric oscillator (OPO) set-up based on two beta barium borate (BBO) crystals, where the interplay between the crystal orientations, cut angles and air dispersion substantially influenced the OPO performance, and especially the angular spectrum of the output beam. Theory suggests that if two BBO crystals are used in this type of design, they should be of different cuts. This paper aims to provide an experimental manifestation of this fact. Furthermore, it has been shown that air dispersion produces similar effects and should be taken into account. An x-ray crystallographic indexing of the crystals was performed as an independent test of the above conclusions.

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“…Considerable prior work has focused on the use of two crystals oriented to compensate spatial walk-off to improve frequency-doubling efficiency [3][4][5][6][7][8][9] and parametricoscillator performance. 10,11 Some of this work has also addressed the key issue of the signs of the effective nonlinear coefficients in the two segments.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 Some of this work has also addressed the key issue of the signs of the effective nonlinear coefficients in the two segments. 3,4,11,12 Additionally, Xijie et al 13 showed that the acceptance angle is doubled for two walk-off-compensated crystals. Walk-off compensation in more than two crystals has been demonstrated in experiments by Andreev et al, who present measurements of second-harmonic generation by means of a beam with a spherical phase front passing through one to five crystals to demonstrate improved mixing efficiency, and by Zondy et al, 14 who used four optically contacted potassium titanyl phosphate (KTP) crystals to frequency double 2529-nm light.…”

Section: Introductionmentioning

confidence: 99%

Increased acceptance bandwidths in optical frequency conversion by use of multiple walk-off-compensating nonlinear crystals

1998

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We show by experiment and mathematical model that angular and frequency acceptance bandwidths for frequency mixing in a nonlinear crystal can often be improved by segmenting the crystal and reversing the spatial or temporal walk-off in alternating segments. We analyze nonlinear mixing primarily in real space, (x, t), rather than Fourier space, (k,), and show that acceptance bands for sum-and difference-frequency mixing can be increased by up to a factor equal to the number of crystal segments. We consider both high-and lowefficiency mixing as well as parametric gain, and show that in many cases of practical interest the increased bandwidth substantially improves conversion efficiency. We also attempt to clarify the role of acceptance bandwidths in frequency mixing.

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Suppression of degenerate parametric processes limiting frequency-doubling efficiency of crystals

Cited by 10 publications

References 0 publications

Parametric amplification and oscillation with walkoff-compensating crystals

Parametric amplification and oscillation with walkoff-compensating crystals

Beam patterns in an optical parametric oscillator set-up employing walk-off compensating beta barium borate crystals

Increased acceptance bandwidths in optical frequency conversion by use of multiple walk-off-compensating nonlinear crystals

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