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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. 3 figs.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
University of California
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
675848
Patent Number(s):
5,828,491
Application Number:
PAN: 8-777,680
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 990200; PA: EDB-99:004416; SN: 98002027975
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 27 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; DESIGN; LASER RADIATION; MASKING; GRATINGS; MAGNETIC DISKS; EFFICIENCY

Citation Formats

Neuman, B., Honig, J., Hackel, L., Dane, C.B., and Dixit, S. Phase plate technology for laser marking of magnetic discs. United States: N. p., 1998. Web.
Neuman, B., Honig, J., Hackel, L., Dane, C.B., & Dixit, S. Phase plate technology for laser marking of magnetic discs. United States.
Neuman, B., Honig, J., Hackel, L., Dane, C.B., and Dixit, S. Tue . "Phase plate technology for laser marking of magnetic discs". United States.
@article{osti_675848,
title = {Phase plate technology for laser marking of magnetic discs},
author = {Neuman, B. and Honig, J. and Hackel, L. and Dane, C.B. and Dixit, S.},
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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {10}
}