Equivalent temperature of nonuniformly heated nonlinear-optical crystals in course of laser radiation frequency conversion

Ryabushkin, O. A.; Konyashkin, Aleksey V.; Myasnikov, D. V.; Tyrtyshnyy, V. A.; Baranov, A. I.

doi:10.1117/12.2023344

SPIE Proceedings

2013

DOI: 10.1117/12.2023344

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Equivalent temperature of nonuniformly heated nonlinear-optical crystals in course of laser radiation frequency conversion

O. A. Ryabushkin

Aleksey V. Konyashkin

D. V. Myasnikov

et al.

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2015

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“…Earlier we introduced application of impedance spectroscopy technique for precise temperature measurement of crystal heated by laser radiation [4]. Experimental determination of equivalent temperature of nonlinear-optical crystal in course of laser radiation frequency conversion was also demonstrated [5]. Moreover piezoelectric laser calorimetry was successfully applied for determination of optical absorption coefficients of crystals in wide spectral range [6,7].…”

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confidence: 99%

Self-Action of Second Harmonic Generation and Longitudinal Temperature Gradient in Nonlinear-Optical Crystals

Baranov

Konyashkin

Ryabushkin

2015

J. Phys.: Conf. Ser.

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Abstract. Model of second harmonic generation with thermal self-action was developed. Second harmonic generation temperature phase matching curves were measured and calculated for periodically polled lithium niobate crystal. Both experimental and calculated data show asymmetrical shift of temperature tuning curves with pump power. IntroductionDespite rapid development of laser physics and quantum optics in last decades, problem of generation spectrum broadening of high-power coherent radiation sources is still vitally important in nowadays. One of the most efficient ways to deal with this issue is application of nonlinear-optical crystals for conversion of pump laser radiation into multiple harmonics [1]. Requirement of coherence conservation specifies fulfillment of phase matching condition for pump and generated photons along nonlinear-optical crystal length [2]. Wave detuning from phase matching is linear function of refractive indices of interacting harmonics. Crystal temperature change in course of laser frequency conversion is the main factor responsible for refractive indices variations. As follows, accurate and noncontact methods of nonlinear-optical crystal temperature control are needed in case of high-power (tens or hundreds Watts) pump radiation nonlinear conversion [3].In present paper we introduce novel method for noncontact temperature measurement of nonlinearoptical crystals during its interaction with laser radiation. Here radiofrequency (RF) impedance spectroscopy plays the key role. As every nonlinear-optical crystal possess piezoelectric properties then its response to the applied ac electric field strongly varies at frequencies that correspond to internal vibration modes of the sample. It is well known that in first approximation piezoelectric resonance frequencies linearly depend on temperature. Earlier we introduced application of impedance spectroscopy technique for precise temperature measurement of crystal heated by laser radiation [4]. Experimental determination of equivalent temperature of nonlinear-optical crystal in course of laser radiation frequency conversion was also demonstrated [5]. Moreover piezoelectric laser calorimetry was successfully applied for determination of optical absorption coefficients of crystals in wide spectral range [6,7]. We developed mathematical model that proves validity of equivalent temperature concept, which suggests direct temperature measurement of nonuniformly heated crystal using its temperature calibrated piezoelectric resonances [8]. Temperature calibration of resonance frequencies is performed

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confidence: 99%

Self-Action of Second Harmonic Generation and Longitudinal Temperature Gradient in Nonlinear-Optical Crystals

Baranov

Konyashkin

Ryabushkin

2015

J. Phys.: Conf. Ser.

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Equivalent temperature of nonuniformly heated nonlinear-optical crystals in course of laser radiation frequency conversion

Cited by 1 publication

References 0 publications

Self-Action of Second Harmonic Generation and Longitudinal Temperature Gradient in Nonlinear-Optical Crystals

Self-Action of Second Harmonic Generation and Longitudinal Temperature Gradient in Nonlinear-Optical Crystals

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