Non-destructive evaluation of thin film coatings using a laser-induced surface thermal lensing effect

Wu, Zhouling; Kuo, P. K.; Lu, Yajie; Gu, Shaoting; Krupka, René

doi:10.1016/s0040-6090(96)09055-4

Cited by 15 publications

(7 citation statements)

References 12 publications

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“…The scheme allows the measurement of absorption factors down to 1.2 3 10 27 in a 0.35-mm 3 volume by use of a heating laser power of 100 mW incident upon the sample. Results are presented that prove that a 450-nm axial resolution is possible when a 1.2 water immersion objective lens with a N. Thermal lensing provides high-sensitivity measurements for thermal 1 and spectroscopic 2 characterization or detection 3 -5 and imaging 6 of low-absorption samples. Thermal-lens microscopy 7 combines the high sensitivity of photothermal techniques 8 with the lateral and axial resolution of conventional microscopy.…”

Section: Received October 24 2003mentioning

confidence: 82%

Confocal thermal-lens microscope

Moreau

Loriette

2004

Opt. Lett.

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International audienceThe use of a confocal detection scheme in a dual-beam thermal-lens microscope is presented. The scheme allows the measurement of absorption factors down to 1.2×10-7 in a 0.35-μm3 volume by use of a heating laser power of 100 mW incident upon the sample. Results are presented that prove that a 450-nm axial resolution is possible when a 1.2 water immersion objective lens with a N.A. of 1.2 is use

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Section: Received October 24 2003mentioning

confidence: 82%

Confocal thermal-lens microscope

Moreau

Loriette

2004

Opt. Lett.

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“…The transmittance spectra of the samples were measured using a Lambda 900 spectrophotometer and the measurement error is within 0.08%. The surface thermal lensing (STL) method has been used to measure the absorption of samples [8][9][10]. The sensitivity of the measurement is 1 ppm.…”

Section: Methodsmentioning

confidence: 99%

Influence of SiO2 additional layers on the laser induced damage threshold of Ta2O5 films

et al. 2008

Optics & Laser Technology

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“…In this way the detector monitors intensity changes at the center of the probe beam, which is proportional to the optical absorptance of the sample. To convert the PTD signal into absorptance data, the traditional calibration method for PTD is used, where the calibration coefficient is achieved by measuring the PTD signal of a calibration thin film sample with known absorptance [2,3,7].…”

Section: Methodsmentioning

confidence: 99%

<title>High reflector absorptance measurements by the surface thermal lensing technique</title>

Chow

Taylor

et al. 1997

SPIE Proceedings

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November 4, 1996This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. ABSTRACTSurface thermal lensing is an alternate configuration of a photothermal deflection system that was used to measure low levels of optical absorption. The thermal lensing configuration facilitated the alignment of the pump and probe laser beams by using a larger diameter probe beam. This technique was applied to high performance optical coatings, specifically high reflectors at 511 nm, zero degrees angle of incidence. The absorptance of these coatings was previously measured using a high power copper vapor laser system. A high power copper laser beam is focused onto a ~2 mm diameter spot. A thermal camera senses the temperature rise with respect to the rest of the coating. The temperature change, power density and beam diameter were used with an empirical formula that yields optical absorption. The surface thermal lensing technique was able to resolve absorption levels lower than that achieved with the copper laser method.

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Non-destructive evaluation of thin film coatings using a laser-induced surface thermal lensing effect

Cited by 15 publications

References 12 publications

Confocal thermal-lens microscope

Confocal thermal-lens microscope

Influence of SiO2 additional layers on the laser induced damage threshold of Ta2O5 films

<title>High reflector absorptance measurements by the surface thermal lensing technique</title>

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