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# Coherent X Ray Generator

IP.com Disclosure Number: IPCOM000084935D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 28K

IBM

Zory, PS: AUTHOR

## Abstract

Described is a method and structure for generating coherent X-rays. References [1] and [2] describe some of the recent work in this area.

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Coherent X Ray Generator

Described is a method and structure for generating coherent X-rays. References [1] and [2] describe some of the recent work in this area.

The basic geometry of the structure is shown in Fig. 1. The structure functions essentially like a charged capacitor. A short, high-power pulse of light 10 is directed through a transparent substrate 12 and is used to vaporize a region of diameter "d" in metal layer 14. The high-pressure generated blows out a plug of oxide as shown in Fig. 2. The ejected plasma of metal ions and electrons contacts the aluminum surface 16 causing the capacitor to be discharged into the plasma. The inductance of such a configuration is quite small and it is expected that very high peak power can be delivered to the plasma.

The following is a rough calculation which attempts to demonstrate the feasibility of producing coherent X-rays, referred to as amplified spontaneous emission cases (ASE), using this scheme.

In order to observe ASE from a gain medium with gain/length g and length L, the following must be achieved: gL >/= 1 (1).

If the gain medium is homogeneous it can be shown that: g Approx./= NLambda/2/ over 10 (2). where N = inversion density and Lambda is the wavelength of interest. Assume the following: L = 5 Mu; Lambda = 10A ; d = 10 Mu; then from (i) and (2) N = 10 over 10/-14/5 X 10/-4/ = 2 X 10/18//cc = 10 over Lambda/2/L (3).

Total number of atoms inverted in volume d/2/L to achieve N = 2 X 10/18//Mu is N(T) =...