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

Abstract

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{sup -2} at 1064 nm and 18.44{+-}0.31 and 7.52{+-}0.22 GW cm{sup -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.

Authors:
; ; ; ; ;  [1];  [2];  [3]
  1. Department of Physics, Indian Institute of Science, Bangalore-560012 (India)
  2. (India)
  3. (Portugal)
Publication Date:
OSTI Identifier:
20788083
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 99; Journal Issue: 8; Other Information: DOI: 10.1063/1.2193164; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; BREAKDOWN; CRYSTALLOGRAPHY; CRYSTALS; DAMAGE; HARDNESS; LASER RADIATION; LASERS; MALIC ACID; MORPHOLOGY; NONLINEAR OPTICS; PULSES; SURFACES; UREA; VICKERS HARDNESS; WAVELENGTHS

Citation Formats

Vanishri, S., Bhat, H. L., Deepthy, A., Nampoori, V. P. N., Matos Gomes, E. de, Belsley, M., International School of Photonics, Cochin University of Science and Technology, Kochi-682022, and Departamento de Fisica, Universidade do Minho, 4709 Braga. Laser damage threshold studies on urea L-malic acid: A nonlinear optical crystal. United States: N. p., 2006. Web. doi:10.1063/1.2193164.
Vanishri, S., Bhat, H. L., Deepthy, A., Nampoori, V. P. N., Matos Gomes, E. de, Belsley, M., International School of Photonics, Cochin University of Science and Technology, Kochi-682022, & Departamento de Fisica, Universidade do Minho, 4709 Braga. Laser damage threshold studies on urea L-malic acid: A nonlinear optical crystal. United States. doi:10.1063/1.2193164.
Vanishri, S., Bhat, H. L., Deepthy, A., Nampoori, V. P. N., Matos Gomes, E. de, Belsley, M., International School of Photonics, Cochin University of Science and Technology, Kochi-682022, and Departamento de Fisica, Universidade do Minho, 4709 Braga. Sat . "Laser damage threshold studies on urea L-malic acid: A nonlinear optical crystal". United States. doi:10.1063/1.2193164.
@article{osti_20788083,
title = {Laser damage threshold studies on urea L-malic acid: A nonlinear optical crystal},
author = {Vanishri, S. and Bhat, H. L. and Deepthy, A. and Nampoori, V. P. N. and Matos Gomes, E. de and Belsley, M. and International School of Photonics, Cochin University of Science and Technology, Kochi-682022 and Departamento de Fisica, Universidade do Minho, 4709 Braga},
abstractNote = {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{sup -2} at 1064 nm and 18.44{+-}0.31 and 7.52{+-}0.22 GW cm{sup -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.},
doi = {10.1063/1.2193164},
journal = {Journal of Applied Physics},
number = 8,
volume = 99,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}