A radio-frequency impedance spectroscope for studying interaction of high-power laser radiation with crystals

Konyashkin, A. V.; Doronkin, A. V.; Tyrtyshnyi, V. A.; Ryabushkin, O. A.

doi:10.1134/s0020441209060116

Cited by 3 publications

(8 citation statements)

References 20 publications

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“…We have employed these techniques in an experimental setup, which we developed for measurement of piezoelectric resonances of nonlinear-optical crystals during their interaction with single-mode laser radiation. The temperature control of both the crystal and the surrounding air was realized with 10 mK accuracy [8]. We have observed that piezoelectric resonance frequencies of nonlinear-optical crystals (LiNbO 3 , KH 2 PO 4, KTiOPO 4 , LiB 3 O 5 and many others) widely used for laser frequency conversion are highly sensitive even to lowpower radiation influence.…”

Section: Introductionmentioning

confidence: 99%

Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

Ryabushkin¹,

Myasnikov²,

Konyashkin³

et al. 2011

J. Eur. Opt. Soc.-Rapid Publ.

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Temperature calibrated piezoelectric resonances of internal acoustic vibration modes of a nonlinear-optical crystal during its heating by high-power laser radiation are used for noncontact measurements of both the non-uniform temperature distribution in the crystal volume and in the surrounding air. A novel notion of equivalent temperature of a crystal heated by laser radiation is introduced in laser physics. The true non-uniform crystal thermodynamic temperature at a given laser power is substituted by the measured equivalent crystal temperature, which is constant at that laser power. Using appropriate laser heating model the measured value of the equivalent crystal temperature allows one to calculate the unknown linear and nonlinear optical absorption coefficients as well as the heat transfer coefficient of the crystal with the surrounding air.

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Section: Introductionmentioning

confidence: 99%

Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

Ryabushkin¹,

Myasnikov²,

Konyashkin³

et al. 2011

J. Eur. Opt. Soc.-Rapid Publ.

Self Cite

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“…By substitution (2) and (4) in equation (5) (2 ) :e e ( )exp (2 2 ) . For simplification we assume that dielectric medium is low-loss and low-nonlinear and neglecting the second derivatives with respect to coordinates of complex envelopes (slow varying amplitude approximation).…”

Section: Model Of Second Harmonic Generation In Nonlinear-optical Crymentioning

confidence: 99%

“…Here colon denotes tensor sum, ε 0 is permittivity of vacuum and χ (2) is third rank tensor of secondorder nonlinear-optical susceptibility. Overall electric field space-time dependence will be the sum result of first and second harmonic waves propagating along x 3 can be represented as…”

Section: Model Of Second Harmonic Generation In Nonlinear-optical Crymentioning

confidence: 99%

“…When we consider interaction with laser radiation the crystal is heated due to optical absorption and commonly its temperature is nonuniformly distributed in correspondence with laser intensity profile. It was proved experimentally [2,3] and theoretically [4] that for the last case nonuniform temperature distribution can be characterized using notion of crystal equivalent temperature. Crystal equivalent temperature is directly determined from measured resonance frequency shift ΔRf n (P) caused by laser irradiation of P power taking into account prt n K value of the resonance.…”

Section: Introductionmentioning

confidence: 99%

“…As refractive indices of the crystal and therefore phase velocities of waves to a considerable extent depend on crystal temperature the last one should be accurately measured and controlled for efficient radiation conversion. Recently noncontact impedance spectroscopy method has been proposed for precise temperature measurement of nonlinear-optical crystals interacting with laser radiation [2][3][4]. It is well known that all nonlinear-optical crystals are piezoelectrics.…”

Section: Introductionmentioning

confidence: 99%

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Crystal equivalent temperature model in process of nonlinear conversion of laser radiation

Ryabushkin¹,

Myasnikov

Baranov

2014

J. Phys.: Conf. Ser.

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Abstract. Theoretical modeling was performed for estimation of influence of thermal effects in nonlinear-optical crystals on process of second harmonic generation of laser radiation. Due to absorption of both pump and generated radiation the temperature distribution inside crystal is substantially nonuniform as in cross-section as along its length. Three dimensional heat conduction problem was solved considering two types of heat sources, conditioned by exponential decay and parabolic growth of laser radiation intensity along crystal length. Longitudinal temperature gradient inside crystal is detrimental for process of laser radiation conversion.

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Solid state laser medium temperature distribution control under lasing condition

Konyashkin¹,

Ryabushkin²,

Korol'kov³

et al. 2018

Fiber Lasers and Glass Photonics: Materials Through Applications

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A radio-frequency impedance spectroscope for studying interaction of high-power laser radiation with crystals

Cited by 3 publications

References 20 publications

Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

Crystal equivalent temperature model in process of nonlinear conversion of laser radiation

Solid state laser medium temperature distribution control under lasing condition

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