# US 4,398,294 A · High power nuclear photon pumped laser

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- Number: US 4,398,294 A
- Document ID: US4398294A
- Status: Granted
- Kind: A
- Application number: 06/213,527
- Filed: 1980-12-05
- Granted: 1983-08-09
- Earliest claimed: 1980-12-05
- Assignees: The United States of America as represented by the Secretary of the Army
- Inventors: Thomas G. Miller; John E. Hagefstration; Dennis R. Womack; Bonnie G. McDaniel
- Web page: https://patentgrep.com/patent/US4398294A

## CPC

- H01S 3/09: Processes or apparatus for excitation, e.g. pumping
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

A device for producing high power coherent radiation by using nuclear energy as the energy source to cause photons to be produced from a photon producing gas and in turn utilizing the photons to pump a laser gas to create a population inversion necessary for lasing.

## Claims

### Claim 1

A high power nuclear photon pumped laser comprising a neutron source capable of producing at least 10.sup.15 neutrons in a 100 nsec to 100 .mu.sec pulse, a material means with a large neutron inelastic scattering cross section mounted adjacent said neutron source for converting neutron energy from said neutron source to gamma and X-ray energy, a moderator material means mounted adjacent said material means with said large neutron inelastic scattering cross section and away from said neutron source for further slowing the neutron energy from said neutron source, a reflector material means mounted relative to said moderator material means in such a manner to define with said moderator material means a chamber, gas tube means for confining an active gaseous medium, said tube means being transparent to photons and mounted in said chamber and having ends that project outside said chamber, means for defining a resonant cavity including cavity mirrors mounted at opposite ends of said tube means, one of said cavity mirrors being partially transparent from passing an output therethrough, said tube means having an active gas mixture therein which includes XeF.sub.2, and said chamber having a photon producing fluid therein that includes Xe, whereby when neutron energy is produced by said neutron source, energy therefrom acts on the photon producing fluid to produce photons which in turn act as a pumping means for said lasing gas mixture to cause a population inversion necessary for lasing.

### Claim 2 (depends on 1)

A high power nuclear photon pumped laser as defined in claim 1, wherein said material means with a large neutron inelastic scattering cross section is made of iron.

### Claim 3 (depends on 2)

A high power nuclear photon pumped laser as defined in claim 2, wherein said moderator material means is selected from the group consisting of graphite, beryllium, and paraffin.

### Claim 4 (depends on 3)

A high power nuclear photon pumped laser as defined in claim 3, wherein said reflector material means is selected from the group consisting of graphite and beryllium.

### Claim 5 (depends on 4)

A high power nuclear photon pumped laser as defined in claim 4, wherein said material means with a large neutron inelastic scattering cross section is in the shape of a cylinder, said moderator material means is in the shape of a cylinder that is telescoped over said material means which has a large neutron inelastic scattering cross section, and said reflector material means includes two end disks and an outer cylinder member.

### Claim 6 (depends on 5)

A high power nuclear photon pumped as set forth in claim 5, wherein said tube means includes a multiplicity of tubes.

### Claim 7 (depends on 6)

A high power nuclear photon pumped laser as defined in claim 6, wherein said multiplicity of tubes are arranged in a circular pattern and are equally spaced from each other.