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Conversion of laser pulse optical energy to photo-acoustic wave in nm-scale layered tlgase2 crystals
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0002-5260-5322
2014 (English)In: IOP Conference Series: Materials Science and Engineering, 2014, Vol. 68, no 1Conference paper (Refereed)
Abstract [en]

Experiments are presented that reveal an efficient optical energy conversion from the visible to the infrared wavelengths range as a result of photo-acoustic response (PAR) after light pulse incites onto the free surface of Tlgase2 crystal. Excitation was carried out with a tunable wavelength of ns-pulse laser and the PAR was detected laterally with a focused cw- probe. The observed properties can be related to variety of successive factors: high electron- hole-phonon deformation potential, a high factor of refraction coefficient dependency on pressure, the absence of surface recombination and the band filling effect, in relation with low absorption coefficient due to the forbidden direct-band optical transition in Tlgase2. All these ensure that the acoustic energy remain well confined under a wide pulse power and energy range suggesting that Tlgase2 is a promising material for dynamic optical energy conversion.

Place, publisher, year, edition, pages
2014. Vol. 68, no 1
, IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 012004
Keyword [en]
Acoustics, Energy conversion, Laser excitation, Phonons, Absorption co-efficient, Acoustic response, Band filling effects, Deformation potential, Infrared wavelengths, Refraction coefficient, Surface recombinations, Tunable wavelength, Thermoacoustics
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-167522DOI: 10.1088/1757-899X/68/1/012004ISI: 000346408700004ScopusID: 2-s2.0-84913582654OAI: diva2:819710
Symposium D on Phonons and Fluctuations in Low Dimensional Structures, 26 May 2014 through 30 May 2014

QC 20150611

Available from: 2015-06-11 Created: 2015-05-22 Last updated: 2015-06-11Bibliographically approved

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Linnros, Jan
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Material Physics, MF
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