Laser Picosecond Acoustics in Various Types of Thin Film

Autor:	Takao Hyoguchi, Oliver B. Wright, Katsuhiro Kawashima
Rok vydání:	1992
Předmět:	Materials science Diamond-like carbon Opacity business.industry General Engineering General Physics and Astronomy Laser Amorphous solid law.invention Transducer Optics law Picosecond Thin film business Layer (electronics)
Zdroj:	Japanese Journal of Applied Physics. 31:85
ISSN:	1347-4065 0021-4922
DOI:	10.7567/jjaps.31s1.85
Popis:	We describe the excitation and detection of picosecond stress pulses in a variety of thin films using an ultra fast laser pump-probe technique to measure the film reflectance variation. An opaque thin film of amorphous diamond-like carbon of known thickness is first investigated and the longitudinal sound velocity derived. Two methods of testing transparent films on opaque substrates are then considered, one a conventional technique in which an opaque transducer layer is deposited on the transparent film, and one a new technique in which the transparent film is uncoated. For the latter technique it is shown how both the sound velocity and the film thickness can be determined.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bf9dac8b25959440a4bc7e2eb5b9a533 https://doi.org/10.7567/jjaps.31s1.85 Zobrazit plný text záznamu