Transient thermal lens formed by short laser pulse in condensed medium

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · J. Eng. Phys. (Engl. Transl.); (United States)

OSTI ID:6127926

Bruk-Levinson, E T; Khodan, I V; Plochotski, Z

There has been growing recent interest in quasioptical structures developing in nonuniformly heated media. Gradients of thermodynamic parameters cause space-time modulation of the refractive index, which alters the optical properties of the medium. It has been demonstrated elsewhere that formation and relaxation of a thermal phase diffraction can be successfully used in transient holography as well as for contactless measurements of thermophysical properties of materials. There are also known gaseous lenses used as phase correctors for light guides. In this paper the authors present the results of a study pertaining to a thermal lens formed during passage of a short strong laser pulse through a thin layer of a substance, and a relationship established between the thermophysical properties of that substance, the space-time variation of the refractive index, and the optical properties of the lens. (An expression is obtained for the focal length of such a lens and the asymptotic trend of the focal length as time increases is determined.)

• Research Organization: A.V. Lykov Institute of Heat and Mass Transfer, Academy of Sciences of the Belroussian SSR, Minsk
• OSTI ID: 6127926
• Journal Information: J. Eng. Phys. (Engl. Transl.); (United States), Journal Name: J. Eng. Phys. (Engl. Transl.); (United States) Vol. 45:6; ISSN JEPHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ELECTROMAGNETIC RADIATION
FABRICATION
FIBERS
FLUID FLOW
GAS FLOW
LASER RADIATION
LENSES
LIGHT TRANSMISSION
OPTICAL FIBERS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PULSES
RADIATIONS
REFRACTION
SPACE-TIME
THERMODYNAMIC PROPERTIES
THERMODYNAMICS