Robert H Sipman

40414159, Aug 9, 1977

May 7, 1976

5/684456

Earl R. Ault - Rolling Hills Estates CA
Philip C. Stevens - Redondo Beach CA
Robert H. Sipman - Agoura CA
Robert S. Bradford - Los Angeles CA

Northrop Corporation - Los Angeles CA

H01S 3097

331 945PE

An e-beam pumped laser employs a hollow cylindrical anode and cathode structure, the cathode being externally concentric with the anode. The lasing gas is contained within a chamber formed by the anode, an optical oscillator cavity being formed between mirrors placed at opposite ends of the anode chamber. The laser gas is excited by means of an e-beam directed radially inwardly from the cathode through the walls of the anode, which are formed of a thin foil, into the laser gas cavity.

49681214, Nov 6, 1990

Dec 7, 1988

7/281134

Hans W. Bruesselbach - Calabasas CA
Robert H. Sipman - Agoura CA

Hughes Aircraft Company - Los Angeles CA

G02B 523
H03F 700
F27D 704

350354

An apparatus for maintaining a crystal at a precisely controlled operating temperature over extended periods of time without significant thermal degradation of the crystal. The apparatus has thermally conducting walls. The walls define an inner hermetically sealed chamber for the crystal. Input and output windows are hermetically sealed to the input and output ends of the chamber. The inner surfaces of these windows are maintained at the operating temperature of the crystal to prevent fogging of the windows. Flexible thermal conducting layers are used between the crystal surfaces and the walls of the chamber to achieve uniform and continuous thermal contact therebetween, without mechanical stress to the crystal. The structure provides fast thermal response, controlled temperature in the crystal interaction region and stability of operation over extended periods of time. In one preferred embodiment, the crystal is held in suspended position within the chamber between a pair of spring-loaded plungers.