Optical system

Patent metadata

Field	Value
Publication number	US-11294130-B2
Application number	US-201917270314-A
Country	US
Kind code	B2
Filing date	Aug 20, 2019
Priority date	Aug 24, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The invention relates to an optical system having a light source, configured to emit electromagnetic radiation; a waveguide, configured to guide the electromagnetic radiation in a guiding direction and having an input; and an injection device, configured to inject the electromagnetic radiation emitted by the light source at the input of the waveguide. The injection device consists of a single dioptric interface designed to focus the electromagnetic radiation emitted by the light source at the input of the waveguide.

First claim

The invention claimed is:

1. The optical system, comprising:
a light source configured to emit electromagnetic radiation;
a waveguide configured to guide the electromagnetic radiation in a guiding direction, and having an entrance; and
an injecting device configured to inject the electromagnetic radiation emitted by the light source into the entrance of the waveguide, wherein
the injecting device consists of a single dioptric interface configured to focus the electromagnetic radiation emitted by the light source onto the entrance of the waveguide, and
the single dioptric interface has a geometric shape defined by the following equations:

f
0

=

y
+

x

tan
⁡

[

arctan
⁡

(

y
′

)

-

arcsin
⁡

(

n
1

/

n
2

⁢

⁢

sin
⁡

(

arctan
⁡

(

y
′

)

+

arctan
⁡

(

x

d
+
y

)

)

)

]

y
⁡

(
0
)

=
0

y
″

⁡

(
0
)

=

1

n
2

-

n
1

⁢

(

n
1

d

+

n
2

f
0

)

where:
x and y designate the abscissa and the ordinate of the single dioptric interface in a plane provided with a Cartesian coordinate system, respectively;
y′ and y″ designate a first derivative and a second derivative of y, respectively;
tan, arctan, sin and arcsin designate the tangent, arc tangent, sine and arc sine functions, respectively;
n 1 and n 2 designate refractive indices of two media separated by the single dioptric interface, n 1 being the refractive index of a medium containing the light source, and n 2 being the refractive index of a medium containing the waveguide;
d designates a distance separating the light source from an origin of the Cartesian coordinate system; and
f 0 designates a distance separating the entrance of the waveguide from the origin of the Cartesian coordinate system.

2. The optical system as claimed in claim 1 , wherein the electromagnetic radiation emitted by the light source possesses a wavelength, denoted λ, and wherein the single dioptric interface comprises a segment extending in a direction perpendicular to the guiding direction, said segment having a dimension larger than or equal to 10λ.

3. The optical system as claimed in claim 1 , wherein the single dioptric interface extends to the entrance of the waveguide.

4. The optical system as claimed in claim 3 , wherein the single dioptric interface is fastened to the entrance of the waveguide by welding or adhesive bonding.

5. The optical system as claimed in claim 3 , wherein the single dioptric interface and the waveguide are integrally formed.

6. The optical system as claimed in claim 1 , wherein the single dioptric interface is made of a material chosen from polymethyl methacrylate, polycarbonate, and a glass.

7. The optical system as claimed in claim 1 , wherein the light source is Lambertian.

8. The optical system as claimed in claim 1 , wherein the waveguide is chosen from a planar guide and a cylindrical guide.

9. The optical system as claimed in claim 1 , wherein a ratio d/f 0 is lower than or equal to 0.5.

10. The optical system as claimed in claim 1 , wherein a ratio n 2 /n 1 is higher than or equal to 1.5.

Assignees

• Commissariat Energie Atomique

Inventors

• Le Blevennec Gilles
• Berne Philippe

Classifications

• G02B6/4298 Primary

  coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers · CPC title

• G02B6/0006 Primary

  Coupling light into the fibre (in general G02B6/4298) · CPC title

• G02B6/003

  Lens or lenticular sheet or layer · CPC title

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title