Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

O. A. Ryabushkin; D. V. Myasnikov; A. V. Konyashkin; V. A. Tyrtyshnyy

doi:10.2971/jeos.2011.11032

Journal of the European Optical Society - Rapid publications, Vol 6 (2011)

Equivalent temperature of nonlinear-optical crystals interacting with laser radiation

O. A. Ryabushkin, D. V. Myasnikov, A. V. Konyashkin, V. A. Tyrtyshnyy

Abstract

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 highly accurate 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.

Full Text: PDF

Citation Details

Cite this article

References

V. G. Dmitriev, and L. V. Tarasov Applied Nonlinear Optics (Phyzmatlit, Moscow, 2004) in Russian.

B. Boulanger, I. Rousseau, J. P. F'eve et al "Optical studies of laserinduced gray-tracking in KTP" IEEE Journal of Quantum Electronics 35, No.3, 281-286 (1999).

M. N. Satyanarayan, and H. L. Bhat "Electrical and optical characterization of electrochromic damages in KTP single crystals" Journal of the Korean Physical Society 32, 420-423 (1998).

A. Hildenbrand, F. R. Wagner, H. Akhouayri et al "Laser-induced damage investigation at 1064nm in KTiOPO4 crystals and its analogy with RbTiOPO4" Applied Optics 48, No. 21, 4263-4269 (2009).

X. Mu, and Y. J. Ding "Investigation of damage mechanisms of KTiOPO4 crystals by use of a continuous-wave argon laser" Applied Optics 39, No. 18, 3099-3103 (2000).

U. Willamowsky, D. Ristau, and E. Welsch "Measuring the absolute absorptance of optical laser components" Applied Optics 37, No. 36, 8362-8370 (1998).

O. A. Ryabushkin, A. V. Konyashkin, and D. V. Myasnikov "Equivalent temperature of crystal interacting with laser radiation" in Proceeding of the EOS Annual Meeting 2010 (EOS, Paris, 2010).

A. V. Konyashkin, A. V. Doronkin, V. A. Tyrtyshnyy, and O. A. Ryabushkin "A Radio-Frequency Impedance Spectroscope for Studying Interaction of High-Power Laser Radiation with Crystals" Instruments and Experimental Techniques 52, No. 6, 816-823 (2009).

C. Yu, M. J. McKenna, J. D. White, and J. D. Maynard "A new resonant photoacoustic technique for measuring very low optical absorption in crystals and glasses" J. Acoustical Society of America 91, No. 2, 868-877 (1992).

F. Bezancon, J. Mangin, P. Stimer, and M. Maglione "Accurate determination of the weak optical absorption of piezoelectric crystals used as capacitive massive bolometers" IEEE Journal of Quantum Electronics 37, No 11, 1396-1400 (2001).

V. A. Tyrtyshnyy, A. V. Konyashkin, and O. A. Ryabushkin "Piezoelectric resonator for optical power measurement with radiation beam quality conservation" Instruments and Experimental Techniques 54, No. 2 (2011) (to be published).

D. Myasnikov, A. Konyashkin, and O. Ryabushkin "Identification of eigenmodes of volume piezoelectric resonators in resonant ultrasound spectroscopy" Technical Physics Letters 36, No. 7, 632-635 (2010).

K. W. Morton, and D. E. Mayers Numerical solutions of partial differential equations (Cambridge University Press, Cambridge, 2005).