Laser interferometer measurements of refractive index in shock-compressed materials

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5576376

Wise, J L; Chhabildas, L C

Laser interferometer systems provide a means for probing the refractive index of transparent specimens subjected to dynamic compression. Previous interferometer measurements of optical properties under shock loading are reviewed for polymethyl methacrylate, fused silica, sapphire, nitromethane, and an aqueous solution of zinc chloride; various degrees of departure from Gladstone-Dale behavior are noted for these materials. In addition, a detailed summary of recent optical studies of lithium fluoride (LiF) is provided. Interferometer data from plate-impact experiments verify sustained LiF transparency for Hugoniot stresses to at least 115 GPa, and establish the variation of LiF refractive index for shock amplitudes ranging from 1.58 to 115 GPa. The refractive-index data for LiF agree with earlier static and shock-wave data, and exhibit a pronounced deviation from predictions based on the Gladstone-Dale, Lorentz-Lorenz, and Drude relations. A modified form of the Gladstone-Dale relation is presented which correctly models the latest LiF measurements. Potential applications of LiF and other window materials to dynamic high-pressure experimentation are discussed.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5576376
• Report Number(s): SAND-85-0310C; CONF-850736-43; ON: DE85015505
• Resource Relation: Conference: American Physical Society topical conference on shock waves in condensed matter, Spokane, WA, USA, 22 Jul 1985
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LITHIUM FLUORIDES
REFRACTIVITY
MEASURING METHODS
WINDOWS
COMPRESSION
DYNAMIC LOADS
INTERFEROMETERS
OPACITY
SHOCK WAVES
ALKALI METAL COMPOUNDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MEASURING INSTRUMENTS
OPENINGS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
360603* - Materials- Properties