Ultrashort time-resolved x-ray source

Details Ultrashort time-resolved x-ray source Ultrashort time-resolved x-ray source

1989-03-22

1991-08-20

Church, Craig E.

X-ray or gamma ray systems or devices

Source

Electron tube

378136, H01J 3532

Patent

active

050420585

ABSTRACT:
A photoemissive photocathode, preferably tantalum-surfaced cesium-antimonide, is illuminated with pulses of 5320 .ANG. laser light, typically 20 psec. at an 20 Hz repetition rate, to emit electrons by the photoelectric effect. The emitted electrons are accumulated in a spatial region near the photocathode by a grid electrode. The same laser pulses activate a semiconductor switch, normally an LiTaO.sub.3 crystal doped with 2.24% Cu, to apply a high voltage, typically 100 kV, between the photocathode and an anode. The accumulated electrons are accelerated, and focused, as an electron beam that strikes the anode, typically in a focal spot of less than 0.5 mm diameter. Time-resolved x-ray pulses, typically K band of 20 picoseconds duration with 4-10 microjoules energy each, are produced. The x-ray pulses are useable in x-ray lithography, or in x-ray spectroscopy of a specimen in which molecular reaction is initiated and/or energized by the same laser light pulses that also give rise to the x-ray pulses.

REFERENCES:
patent: 4606061 (1986-08-01), Ramamurti
patent: 4692938 (1987-09-01), Oba
patent: 4724536 (1988-02-01), Oba

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