High-efficiency and directional non-resonant laser using scattering cavity and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12374850-B2
Application number	US-202117626122-A
Country	US
Kind code	B2
Filing date	Dec 3, 2021
Priority date	Dec 18, 2020
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

Various embodiments provide a high-efficiency and directional non-resonant laser using a scattering cavity and a method of manufacturing the same. According to various embodiments, the non-resonant laser may include a gain medium unit in which a scattering cavity and an entrance communicating with the scattering cavity are provided, and a pumping and supply unit configured to supply pumping light to an inside of the scattering cavity. The gain medium unit may be implemented to be excited by the pumping light on the inside of the scattering cavity and to output emission light through the entrance. According to various embodiments, the gain medium unit may weaken the pumping light while reflecting the pumping light on the inside of the scattering cavity, and may amplify the emission light while reflecting the emission light on the inside of the scattering cavity.

First claim

The invention claimed is:

1. A high-efficiency and directional non-resonant laser, comprising:
a gain medium unit in which a scattering cavity and an entrance communicating with the scattering cavity are provided; and
a pumping and supply unit configured to supply pumping light to an inside of the scattering cavity,
wherein the gain medium unit is excited by the pumping light on the inside of the scattering cavity and outputs emission light through the entrance,
wherein a diameter of the entrance and a diameter of the scattering cavity are defined on planes perpendicular to an axis passing through a center of the entrance and a center of the scattering cavity, and
wherein the diameter of the scattering cavity is increased as the diameter becomes distant from the entrance along the axis.

2. The non-resonant laser of claim 1 , wherein:
the gain medium unit weakens the pumping light while reflecting the pumping light on the inside of the scattering cavity, and amplifies the emission light while reflecting the emission light on the inside of the scattering cavity.

3. The non-resonant laser of claim 1 , wherein the gain medium unit comprises:
a structure in which the scattering cavity and the entrance are provided; and
a scattering gain medium applied on an inner surface of the scattering cavity in the structure.

4. The non-resonant laser of claim 1 , wherein the gain medium unit is manufactured by etching the scattering cavity and the entrance in the scattering gain medium of a solid matter having a volume.

5. The non-resonant laser of claim 3 , wherein the scattering gain medium is implemented in a powder form, mixed with at least one of a binder or a solvent, and applied on the inner surface of the scattering cavity in the structure.

6. The non-resonant laser of claim 3 , wherein the scattering gain medium is implemented in a film form and attached to the inner surface of the scattering cavity in the structure.

7. The non-resonant laser of claim 1 , wherein the diameter of the scattering cavity is a maximum on a center plane perpendicular to the axis at the center of the scattering cavity, and is reduced as the diameter becomes distant from the center plane in a direction becoming distant from the entrance along the axis.

8. The non-resonant laser of claim 1 , wherein a cross section of at least one of the scattering cavity or the entrance is a circle, an oval shape, a crushed circle, a crushed oval shape, or a polygon.

9. The non-resonant laser of claim 1 , wherein the scattering cavity has a spherical shape, an ellipsoid, a crushed spherical shape, a crushed ellipsoid, a cylindrical shape, or a tilted cylindrical shape.

10. The non-resonant laser of claim 1 , wherein the pumping and supply unit supplies the pumping light to the inside of the scattering cavity through the entrance on an outside of the gain medium unit.

11. The non-resonant laser of claim 1 , wherein reflectance of the emission light of the gain medium unit is greater than 0 and less than 1.

12. A high-efficiency and directional non-resonant laser, comprising:
a gain medium unit in which a scattering cavity and an entrance communicating with the scattering cavity are provided; and
a pumping and supply unit configured to supply pumping light to an inside of the scattering cavity,
wherein the gain medium unit is excited by the pumping light on the inside of the scattering cavity and outputs emission light through the entrance,
wherein a diameter of the entrance and a diameter of the scattering cavity are defined on planes perpendicular to an axis passing through a center of the entrance and a center of the scattering cavity,
wherein the diameter of the scattering cavity compared to the diameter of the entrance is determined as

1
2

[

Y
p

⁢

Y

e
⁢
m

(

1
-

Y
p

⁢

Y

e
⁢
m

)

]

-

1
2

,

and
wherein γ p =√{square root over (1−R p )} and γ em =√{square root over (1−R em )}, γ p indicates the diameter of the scattering cavity and γ em indicates the diameter of the entrance, R p indicates reflectance of the pumping light of the gain medium unit, and R em indicates reflectance of the emission light of the gain medium unit.

13. The non-resonant laser of claim 12 wherein energy efficiency in the gain medium unit according to the diameter of the scattering cavity compared to the diameter of the entrance is γ 2 p /(γ p +γ em ) 2 .

14. A method of manufacturing a non-resonant laser,
the non-resonant laser being a high-efficiency and directional non-resonant laser, comprising
a gain medium unit in which a scattering cavity and an entrance communicating with the scattering cavity are provided; and
a pumping and supply unit configured to supply pumping light to an inside of the scattering cavity,
the gain medium unit being excited by the pumping light on the inside of the scattering cavity and outputs emission light through the entrance,
the method comprising:
preparing the gain medium unit in which the scattering cavity and the entrance are provided; and
combining the gain medium unit and the pumping and supply unit,
wherein a diameter of the entrance and a diameter of the scattering cavity are defined on planes perpendicular to an axis passing through a center of the entrance and a center of the scattering cavity,
wherein the diameter of the scattering cavity compared to the diameter of and the entrance is determined as

1
2

[

Y
p

⁢

Y

e
⁢
m

(

1
-

Y
p

⁢

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Park Yongkeun
• Lee KyeoReh

Classifications

• H01S3/30

  using scattering effects, e.g. stimulated Brillouin or Raman effects · CPC title

• H01S3/08

  Construction or shape of optical resonators or components thereof · CPC title

• H01S3/05

  Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium · CPC title

• H01S3/1685 Primary

  Ceramics · CPC title

• H01S3/0602

  Crystal lasers or glass lasers (H01S3/063 takes precedence) · CPC title