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Title: Phase plate technology for laser marking of magnetic discs

Abstract

An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A continuous phase pattern eliminates large phase jumps typically expected in a grating that provides arbitrary shapes. Large phase jumps increase scattered light outside of the desired pattern, reduce efficiency and can make the grating difficult to manufacture. When manufacturing capabilities preclude producing a fully continuous grating, the present design can be easily adapted to minimize manufacturing errors and maintain high efficiencies. This continuous grating is significantly more efficient than previously described Dammann gratings, offers much more flexibility in generating spot patterns and is easier to manufacture and replicate than a multi-level phase grating.

Inventors:
 [1];  [1];  [1];  [1];  [1]
  1. (Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
871942
Patent Number(s):
5828491
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
phase; plate; technology; laser; marking; magnetic; discs; advanced; design; enables; distribution; spots; arbitrarily; shaped; patterns; uniformity; continuously; near-continuously; varying; pattern; continuous; eliminates; jumps; typically; expected; grating; provides; arbitrary; shapes; increase; scattered; light; outside; desired; reduce; efficiency; difficult; manufacture; manufacturing; capabilities; preclude; producing; easily; adapted; minimize; errors; maintain; efficiencies; significantly; efficient; previously; described; dammann; gratings; offers; flexibility; generating; spot; easier; replicate; multi-level; scattered light; continuous phase; phase plate; desired pattern; varying phase; previously described; phase grating; continuously varying; arbitrary shape; easily adapted; /359/219/430/

Citation Formats

Neuman, Bill, Honig, John, Hackel, Lloyd, Dane, C. Brent, and Dixit, Shamasundar. Phase plate technology for laser marking of magnetic discs. United States: N. p., 1998. Web.
Neuman, Bill, Honig, John, Hackel, Lloyd, Dane, C. Brent, & Dixit, Shamasundar. Phase plate technology for laser marking of magnetic discs. United States.
Neuman, Bill, Honig, John, Hackel, Lloyd, Dane, C. Brent, and Dixit, Shamasundar. Thu . "Phase plate technology for laser marking of magnetic discs". United States. https://www.osti.gov/servlets/purl/871942.
@article{osti_871942,
title = {Phase plate technology for laser marking of magnetic discs},
author = {Neuman, Bill and Honig, John and Hackel, Lloyd and Dane, C. Brent and Dixit, Shamasundar},
abstractNote = {An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A continuous phase pattern eliminates large phase jumps typically expected in a grating that provides arbitrary shapes. Large phase jumps increase scattered light outside of the desired pattern, reduce efficiency and can make the grating difficult to manufacture. When manufacturing capabilities preclude producing a fully continuous grating, the present design can be easily adapted to minimize manufacturing errors and maintain high efficiencies. This continuous grating is significantly more efficient than previously described Dammann gratings, offers much more flexibility in generating spot patterns and is easier to manufacture and replicate than a multi-level phase grating.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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