Coherent light generators – Particular beam control device
Patent
1993-05-12
1995-02-28
Healy, Brian
Coherent light generators
Particular beam control device
372 21, 372 27, 372 39, 372 40, 372106, 372109, 359333, 359334, 359342, 359343, 359349, H01S 310, H01S 314
Patent
active
053944127
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a power laser with deflection.
2. Discussion of the Background
Already known in the art are lasers which include the function of controlling the angular orientation of the emitted optical beam. However, lasers of this type are of low power.
SUMMARY OF THE INVENTION
3. The invention relates to a power laser including in its structure an angular control of the emission.
The treatment of power laser beams by non-linear optical means makes it possible to envisage a significant improvement in the spatial quality of the emitted beams, and to introduce new functions of angular control or of phase synchronisation of oscillators. The subject of the invention lies in a laser structure exploiting non-linear media with a photo-induced variation of index in order to produce the two following properties simultaneously:
The structure of the laser presented is of the oscillator/amplifier type and it uses non-linear materials for the dynamic inscription of index gratings and the generation of conjugate waves. Furthermore, the direction of the high energy beam emitted by the laser results from the acousto-optic deflection of a low energy beam.
The invention therefore relates to a power laser with direction, characterised in that it comprises at least: direction and a second beam of variable deflection; at least part of the first and second beams, amplifying them and retransmitting an amplified beam towards the medium made of non-linear material which reflects the amplified beam in the direction of the second beam;
BRIEF DESCRIPTION OF THE DRAWINGS
The various objects and characteristics of the invention will appear more clearly in the description which will follow and in the appended figures which represent:
FIG. 1, a general embodiment of the structure according to the invention;
FIG. 2, a detailed embodiment of the structure of the invention;
FIG. 3, a variant embodiment of the device of the invention;
FIG. 4, another variant embodiment of the device of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
To begin with, therefore, a general description of the device of the invention based on FIG. 1 will be given.
Two polarised beams I1 and I2 are transmitted to a medium made of a non-linear material NL1. The beam I2 may be controlled in its angular direction by means not represented. The two beams I1 and I2 interfere in the non-linear medium and create an index grating which causes the transmission of at least part of the light towards an optical amplifier 2. The light makes at least one outward and return journey in the amplifier 2 as a result of reflection at a reflecting device 3.
An amplified beam Ic is sent back towards the non-linear medium NL1.
The direction of polarisation of this beam Ic is rotated through 90.degree. with respect to the direction of polarisation of the beams I1 and I2 because of the presence of the quarter-wave plate .lambda./4. The amplified beam Ic is reflected at least in large part by the non-linear medium, along the direction of the beam I2. A polarisation splitter SP then makes it possible to extract the amplified beam and to emit a beam IT.
The device of the invention comprises, as shown in FIG. 2, the following elements: possible to reflect the wave transmitted by the amplifier 2; inscription of photo-induced gratings having a high diffraction efficiency and whose function will be described in detail hereinafter; angular sweep; oscillator into a beam I1 and a beam I2; phase conjugate mirror 3.
The operation of this laser structure, which includes a function of scanning a large field, is as follows: the beam emerging from the oscillator 1 is split into two beams I1-I2, one of which undergoes a 1D or 2D angular deflection (acousto-optic deflection unit, for example, in the beam deflector 4). The optical system L1-L2 images the centre of rotation of the beam onto the non-linear medium NL1 illuminated by the interference figure of the two beams I1 and I2. The chosen interaction is such that th
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Ayrai Jean-Luc
Huignard Jean-Pierre
Puech Claude
"Thomson-CSF"
Healy Brian
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