Acoustic microscopy at 15. 3 GHz in pressurized superfluid helium

Journal Article · Mon Mar 12 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102603· OSTI ID:6856829

Muha, M S; Moulthrop, A A; Kozlowski, G C ^[1]; Hadimioglu, B ^[2]

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1. The Aerospace Corporation, Mail Station M1/110, P. O. Box 92957, Los Angeles, California 90009 (USA)
2. Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305 (USA)

An acoustic microscope operating at 15.3 GHz and using superfluid {sup 4}He as the coupling medium has been developed. The helium is colder than 0.9 K to achieve low acoustic attenuation, and is pressurized to greater than 20 bar to eliminate three-phonon processes which saturate the received signal as the input power is increased. A resolution of 150 A has been achieved.

• OSTI ID: 6856829
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:11; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
640450 -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACOUSTIC MICROSCOPY
ATTENUATION
EVEN-EVEN NUCLEI
FABRICATION
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
HELIUM 4
HELIUM ISOTOPES
INHIBITION
ISOTOPES
LIGHT NUCLEI
MEDIUM PRESSURE
MICROSCOPY
NUCLEI
OPERATION
PRESSURIZING
RESOLUTION
SATURATION
STABLE ISOTOPES
SUPERFLUIDITY
ULTRALOW TEMPERATURE