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Journal of Applied Physics / Volume 99 / Issue 8 / LASERS, OPTICS, AND OPTOELECTRONICS

J. Appl. Phys. 99, 083107 (2006); http://dx.doi.org/10.1063/1.2193164 (5 pages)

Laser damage threshold studies on urea L-malic acid: A nonlinear optical crystal

S. Vanishri1, H. L. Bhat1, A. Deepthy2, V. P. N. Nampoori2, E. de Matos Gomes3, and M. Belsley3

1Department of Physics, Indian Institute of Science, Bangalore-560012, India
2International School of Photonics, Cochin University of Science and Technology, Kochi-682022, India
3Departamento de Fisica, Universidade do Minho, 4709 Braga, Portugal

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(Received 11 July 2005; accepted 10 March 2006; published online 3 May 2006)

A detailed study of surface laser damage performed on a nonlinear optical crystal, urea L-malic acid, using 7 ns laser pulses at 10 Hz repetition rate from a Q-switched Nd:YAG laser at wavelengths of 532 and 1064 nm is reported. The single shot and multiple shot surface laser damage threshold values are determined to be 26.64±0.19 and 20.60±0.36 GW cm−2 at 1064 nm and 18.44±0.31 and 7.52±0.22 GW cm−2 at 532 nm laser radiation, respectively. The laser damage anisotropy is consistent with the Vickers mechanical hardness measurement performed along three crystallographic directions. The Knoop polar plot also reflects the damage morphology. Our investigation reveals a direct correlation between the laser damage profile and hardness anisotropy. Thermal breakdown of the crystal is identified as the possible mechanism of laser induced surface damage.

© 2006 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
    1. Laser damage measurements
    2. Mechanical hardness measurements
  3. RESULTS AND DISCUSSIONS
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

laser beam effects, nonlinear optics, optical materials, organic compounds, high-speed optical techniques, Vickers hardness

PACS

  • 42.70.Mp

    Nonlinear optical crystals

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

  • 78.47.-p

    Spectroscopy of solid state dynamics

  • 62.20.Qp

    Friction, tribology, and hardness

  • 81.40.Np

    Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2193164

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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