Generation of low-divergence laser beams

Title: Generation of low-divergence laser beams

Full Record
Other Related Research

Abstract

Apparatus for transforming a conventional beam of coherent light, having a Gaussian energy distribution and relatively high divergence, into a beam in which the energy distribution approximates a single, non-zero-order Bessel function and which therefore has much lower divergence. The apparatus comprises a zone plate having transmitting and reflecting zones defined by the pattern of light interference produced by the combination of a beam of coherent light with a Gaussian energy distribution and one having such a Bessel distribution. The interference pattern between the two beams is a concentric array of multiple annuli, and is preferably recorded as a hologram. The hologram is then used to form the transmitting and reflecting zones by photo-etching portions of a reflecting layer deposited on a plate made of a transmitting material. A Bessel beam, containing approximately 50% of the energy of the incident beam, is produced by passing a Gaussian beam through such a Bessel zone plate. The reflected beam, also containing approximately 50% of the incident beam energy and having a Bessel energy distribution, can be redirected in the same direction and parallel to the transmitted beam. Alternatively, a filter similar to the Bessel zone plate can be placed within the resonatormore »« less

Inventors:

Kronberg, James W ^[1]

108 Independent Blvd., Aiken, SC 29801

Issue Date:: 1993-01-01

Research Org.:: WESTINGHOUSE SAVANNAH RIVER CO

OSTI Identifier:: 868924

Patent Number(s):: 5245619

Assignee:: Kronberg, James W. (108 Independent Blvd., Aiken, SC 29801)

Patent Classifications (CPCs):: G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT

Show more

G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
G02B27/09 - Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for {

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT
H01S3/005 - {Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping

G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
G02B27/0927 - {Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat}
G02B27/0988 - {Diaphragms, spatial filters, masks for removing or filtering a part of the beam}

Show less

DOE Contract Number:: AC09-89SR18035

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: generation; low-divergence; laser; beams; apparatus; transforming; conventional; beam; coherent; light; gaussian; energy; distribution; relatively; divergence; approximates; single; non-zero-order; bessel; function; comprises; zone; plate; transmitting; reflecting; zones; defined; pattern; interference; produced; combination; concentric; array; multiple; annuli; preferably; recorded; hologram; form; photo-etching; portions; layer; deposited; material; containing; approximately; 50; incident; passing; reflected; redirected; direction; parallel; transmitted; alternatively; filter; similar; placed; resonator; cavity; front; mirror; rear; axially; aligned; mirrors; inside; generate; source; interference pattern; axially aligned; laser beams; apparatus comprises; laser beam; light beam; light beams; beam energy; energy distribution; laser source; layer deposited; incident beam; reflected beam; coherent light; resonator cavity; apparatus comprise; gaussian beam; containing approximately; reflecting layer; axially align; low-divergence laser; conventional laser; /372/359/

Citation Formats


                    Kronberg, James W. Generation of low-divergence laser beams.  United States: N. p., 1993. 
        Web.

Copy to clipboard


                    Kronberg, James W. Generation of low-divergence laser beams.  United States.

Copy to clipboard


                    Kronberg, James W. Fri .  
        "Generation of low-divergence laser beams".  United States.  https://www.osti.gov/servlets/purl/868924.

Copy to clipboard


                    
@article{osti_868924,

  title        = {Generation of low-divergence laser beams},

  author       = {Kronberg, James W},

  abstractNote = {Apparatus for transforming a conventional beam of coherent light, having a Gaussian energy distribution and relatively high divergence, into a beam in which the energy distribution approximates a single, non-zero-order Bessel function and which therefore has much lower divergence. The apparatus comprises a zone plate having transmitting and reflecting zones defined by the pattern of light interference produced by the combination of a beam of coherent light with a Gaussian energy distribution and one having such a Bessel distribution. The interference pattern between the two beams is a concentric array of multiple annuli, and is preferably recorded as a hologram. The hologram is then used to form the transmitting and reflecting zones by photo-etching portions of a reflecting layer deposited on a plate made of a transmitting material. A Bessel beam, containing approximately 50% of the energy of the incident beam, is produced by passing a Gaussian beam through such a Bessel zone plate. The reflected beam, also containing approximately 50% of the incident beam energy and having a Bessel energy distribution, can be redirected in the same direction and parallel to the transmitted beam. Alternatively, a filter similar to the Bessel zone plate can be placed within the resonator cavity of a conventional laser system having a front mirror and a rear mirror, preferably axially aligned with the mirrors and just inside the front mirror to generate Bessel energy distribution light beams at the laser source.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1993},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE Patents and OSTI.GOV collections:

Micro-cone targets for producing high energy and low divergence particle beams

Patent Le Galloudec, Nathalie

The present invention relates to micro-cone targets for producing high energy and low divergence particle beams. In one embodiment, the micro-cone target includes a substantially cone-shaped body including an outer surface, an inner surface, a generally flat and round, open-ended base, and a tip defining an apex. The cone-shaped body tapers along its length from the generally flat and round, open-ended base to the tip defining the apex. In addition, the outer surface and the inner surface connect the base to the tip, and the tip curves inwardly to define an outer surface that is concave, which is bounded bymore »« less
Full Text Available
Phased laser array for generating a powerful laser beam

Patent Holzrichter, John F.; Ruggiero, Anthony J.

A first injection laser signal and a first part of a reference laser beam are injected into a first laser element. At least one additional injection laser signal and at least one additional part of a reference laser beam are injected into at least one additional laser element. The first part of a reference laser beam and the at least one additional part of a reference laser beam are amplified and phase conjugated producing a first amplified output laser beam emanating from the first laser element and an additional amplified output laser beam emanating from the at least one additionalmore »« less
Full Text Available
Laser beam generating apparatus

Patent Warner, Bruce E [Livermore, CA]; Duncan, David B [Auburn, CA]

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect).
Full Text Available
Laser beam generating apparatus

Patent Warner, Bruce E [Livermore, CA]; Duncan, David B [Auburn, CA]

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect).
Full Text Available
Laser or charged-particle-beam fusion reactor with direct electric generation by magnetic flux compression

Patent Lasche, George P [Arlington, VA]

A high-power-density laser or charged-particle-beam fusion reactor system maximizes the directed kinetic energy imparted to a large mass of liquid lithium by a centrally located fusion target. A fusion target is embedded in a large mass of lithium, of sufficient radius to act as a tritium breeding blanket, and provided with ports for the access of beam energy to implode the target. The directed kinetic energy is converted directly to electricity with high efficiency by work done against a pulsed magnetic field applied exterior to the lithium. Because the system maximizes the blanket thickness per unit volume of lithium, neutron-inducedmore »« less
Full Text Available

Similar Records