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Proceedings Article

Sandwich concept: enhancement for direct absorption measurements by laser-induced deflection (LID) technique

[+] Author Affiliations
Ch. Mühlig, S. Bublitz, W. Paa

Institute for Photonic Technology (Germany)

Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 85301X (December 6, 2012); doi:10.1117/12.976853
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From Conference Volume 8530

  • Laser-Induced Damage in Optical Materials: 2012
  • Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M J Soileau
  • Boulder, Colorado, USA | September 23, 2012

abstract

The new sandwich concept for absolute photo-thermal absorption measurements using the laser induced deflection (LID) technique is introduced and tested in comparison to the standard LID concept. The sandwich concept’s idea is the decoupling of the optical materials for the pump and probe beams by placing a sample of investigation in between two optical (sandwich) plates. The pump beam is guided through the sample whereas the probe beams are deflected within the sandwich plates by the thermal lens that is generated by heat transfer from the irradiated sample. Electrical simulation and laser experiments reveal that using appropriate optical materials for the sandwich plates, the absorption detection limit for photo-thermally insensitive materials can be lowered by up to two orders of magnitude. Another advantage of the sandwich concept, the shrinking of the currently required minimum sample size, was used to investigate the laser induced absorption change in a Nd:YVO<sub>4</sub> crystal at 1030nm. It was found that the absorption in Nd:YVO<sub>4</sub> lowers due to the laser irradiation but partially recovers during irradiation breaks. Furthermore, absorption spectroscopy has been performed at two LBO crystals in the wavelength range 410...600nm to study the absorption structure around the SHG wavelengths of common high power lasers based on Neodymium doped laser crystals.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Ch. Mühlig ; S. Bublitz and W. Paa
"Sandwich concept: enhancement for direct absorption measurements by laser-induced deflection (LID) technique", Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 85301X (December 6, 2012); doi:10.1117/12.976853; http://dx.doi.org/10.1117/12.976853


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