Generation of low-divergence laser beams

Title: Generation of low-divergence laser beams

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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) SRS

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/

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

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

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

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@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}

}

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