Optical beam generating device
First Claim
1. A light beam generator including:
- a light source for outputting coherent light; and
an optical phase modulation element which receives the light output from the light source to modulate a phase of the light depending on a position on a beam cross section of the light, and outputs the light after the phase modulation;
whereina polar coordinate system (r, θ
) having an origin at a beam center position is set on the beam cross section of the light input in the optical phase modulation element, and when domains A0 to Ap are defined on the beam cross section and centers of the domains A0 to Ap are placed commonly at the beam center position, on these domains A0 to Ap, a phase modulation amount Φ
at each position inside an even-numbered domain counted from the beam center is expressed by a formula of Φ
=qθ and
a phase modulation amount Φ
at each position inside an odd-numbered domain counted from the beam center is expressed by a formula of Φ
=qθ
+π
, provided that p is a natural number corresponding to a radial exponent and q is a non-zero integer number corresponding to a declination component.
1 Assignment
0 Petitions
Accused Products
Abstract
The light beam generator 1 is provided with a laser light source 10, an optical phase modulation element 15 and others. The optical phase modulation element 15 receives coherent light output from the laser light source 10 and passed through a beam splitter 14 to modulate a phase of the light depending on a position on the beam cross section of the light, and outputs the light after the phase modulation to the beam splitter 14. A polar coordinate system (r, θ) in which a predetermined position is given as an origin is set on the beam cross section of the light input in the optical phase modulation element 15, and when (p+1) domains divided by p (number of pieces) circumferences in which the predetermined position is given as a center are set, of these (p+1) domains, a phase modulation amount φ at each position inside an even numbered domain counted from the inside is expressed by a formula of “φ=qθ”, and a phase modulation amount φ at each position inside an odd numbered domain counted from the inside is expressed by a formula of “φ=qθ+π”.
4 Citations
2 Claims
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1. A light beam generator including:
-
a light source for outputting coherent light; and an optical phase modulation element which receives the light output from the light source to modulate a phase of the light depending on a position on a beam cross section of the light, and outputs the light after the phase modulation;
whereina polar coordinate system (r, θ
) having an origin at a beam center position is set on the beam cross section of the light input in the optical phase modulation element, and when domains A0 to Ap are defined on the beam cross section and centers of the domains A0 to Ap are placed commonly at the beam center position, on these domains A0 to Ap, a phase modulation amount Φ
at each position inside an even-numbered domain counted from the beam center is expressed by a formula of Φ
=qθ and
a phase modulation amount Φ
at each position inside an odd-numbered domain counted from the beam center is expressed by a formula of Φ
=qθ
+π
, provided that p is a natural number corresponding to a radial exponent and q is a non-zero integer number corresponding to a declination component. - View Dependent Claims (2)
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Specification
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- Resources
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Current AssigneeHamamatsu Photonics KK
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Original AssigneeHamamatsu Photonics KK
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InventorsAndo, Taro, Ohtake, Yoshiyuki, Matsumoto, Naoya, Ito, Haruyasu, Fukuchi, Norihiro
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Primary Examiner(s)MANNO, JESSICA S
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Application NumberUS12/516,416Publication NumberTime in Patent Office1,369 DaysField of Search359/238US Class Current359/238CPC Class CodesG02B 21/32 Micromanipulators structura...G02B 26/06 for controlling the phase o...G02B 27/09 Beam shaping, e.g. changing...G02B 5/3025 Polarisers, i.e. arrangemen...
