OPTICAL BEAM GENERATING DEVICE
First Claim
1. A light beam generator including:
- a light source of 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 predetermined position is set on the beam cross section of the light input in the optical phase modulation element, 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
=q θ
” 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
=q θ
+π
”
, however, provided that p is a natural number and q is an integer other than zero.
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=q θ”, 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=q θ+π”.
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Citations
2 Claims
-
1. A light beam generator including:
-
a light source of 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 predetermined position is set on the beam cross section of the light input in the optical phase modulation element, 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
=q θ
” 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
=q θ
+π
”
, however, provided that p is a natural number and q is an integer other than zero. - View Dependent Claims (2)
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Specification