Lamp for laser applications

Patent metadata

Field	Value
Publication number	US-9977169-B2
Application number	US-201013263634-A
Country	US
Kind code	B2
Filing date	Apr 1, 2010
Priority date	Apr 9, 2009
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A lamp and a method for generating high power in laser applications includes a source for emitting optical radiation along an optical path and a holder configured in the optical path having a fluorescent body. The lamp and method further include a collecting unit configured to transmit at least a portion of the optical radiation emitted by the fluorescent body to an output of the lamp. The fluorescent body includes a shape that is elongated in a predetermined direction. Accordingly, providing a small spot and little divergence in conjunction with good heat dissipation leads to a high optical performance.

First claim

The invention claimed is:

1. A lamp comprising:
a laser source configured to emit an optical radiation along an optical path;
a fluorescent body, cylindrical in shape and elongated in a predetermined direction;
a transparent holder surrounding the fluorescent body along its entire length in the predetermined direction, wherein the holder has a high thermal conductivity and is arranged in the optical path;
a collecting unit configured to transmit at least a portion of the optical radiation emitted by the fluorescent body to an output of the lamp; and,
wherein the collecting unit is parabolic shaped and the transparent holder is contained in the collecting unit.

2. The lamp according to claim 1 , wherein the fluorescent body further comprises a fluorescent material that has a predetermined diameter and a length being one of ≥3 times the predetermined diameter, ≥5 times the predetermined diameter, and ≥10 times the predetermined diameter.

3. The lamp according to claim 2 , wherein the fluorescent material comprises a Lumiramic material.

4. A lamp comprising:
a laser source configured to emit an optical radiation along an optical path;
a transparent holder comprising a fluorescent body, wherein the holder has a high thermal conductivity and is arranged in the optical path; and
a collecting unit configured to transmit at least a portion of the optical radiation emitted by the fluorescent body to an output of the lamp;
wherein the collecting unit is parabolic shaped and the transparent holder is contained in the collecting unit;
wherein the fluorescent body comprises an elongated shape in a predetermined direction, and the holder comprises a shape being elongated in a predetermined direction which is equal to the predetermined direction of the elongated shape of the fluorescent body; and wherein the holder and the fluorescent body have the same length and terminate at a same distance as measured from the laser source along the predetermined direction.

5. The lamp according to claim 4 , further comprising a focusing unit configured to focus the optical radiation emitted from the source onto at least a part of the fluorescent body.

6. The lamp according to claim 4 , further comprising a heat-spreader provided at the holder, wherein the heat-spreader is configured to conduct heat irradiated from the fluorescent body to a heat sink.

7. The lamp according to claim 6 , wherein a housing of the collecting unit is configured to be the heat sink.

8. The lamp according to claim 4 , wherein the holder has one of an optical transmission of ≥80%, of ≥90%, and of ≥95%.

9. The lamp according to claim 4 , wherein the holder has one of a thermal conductivity of ≥10 W/mK, of ≥40 W/mK, of ≥100 W/mK, and of ≥800 W/mK.

10. The lamp according to claim 4 , wherein the holder has a wall thickness being ≥0.5 mm and ≤10 mm.

11. The lamp according to claim 4 , wherein a material of the holder comprises one of a diamond, a sapphire, and a ceramic material.

12. The lamp according to claim 4 , wherein a shape of the holder corresponds to one of a rod, a fiber and a cylinder.

13. The lamp according to claim 12 , wherein the rod has a diameter being ≥1 mm and ≤10 mm.

14. The lamp according to claim 12 , wherein the rod has a length being ≥0.3 mm and ≤100 mm.

15. The lamp according to claim 12 , wherein the rod is a thin elongated Lumiramic material.

16. The lamp according to claim 4 , wherein the holder and the fluorescent body are configured to be spaced away from the light source.

17. The lamp according to claim 4 wherein the holder is configured to be attached to the fluorescent body in an arrangement, wherein the arrangement is configured to provide a thermal interface with a reduced thermal contact resistance, and wherein the arrangement is further configured to provide the holder with an increased thermal conductivity.

18. The lamp of claim 4 wherein the fluorescent body has a cylindrical shape and is capable of retaining its shape independently of physical constraints imposed on it by the holder.

19. A method for using a laser pumped lamp comprising the acts of:
emitting laser pumped optical radiation along an optical path by a source; and
transmitting at least a portion of the optical radiation emitted by a fluorescent body provided in the optical path to an output of a lamp by a collecting unit, wherein the fluorescent body includes a holder having a high thermal conductivity;
wherein the fluorescent body is cylindrical in shape and comprises an elongated shape in a predetermined direction and wherein a transparent holder surrounds the fluorescent body along its entire length in the predetermined direction, and
wherein the collecting unit is parabolic shaped and the holder is contained in the collecting unit.

Assignees

• Kurt Ralph
• Drenten Ronald Reindert
• Paulussen Elvira Johanna Maria
• Valster Adriaan
• Fournier Denis
• Philips Lighting Holding Bv

Inventors

• Kurt Ralph
• Drenten Ronald Reindert
• Paulussen Elvira Johanna Maria
• Valster Adriaan
• Fournier Denis

Classifications

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title

• F21S41/321

  the reflector being a surface of revolution or a planar surface, e.g. truncated · CPC title

• G02B6/0003 Primary

  the light guides being doped with fluorescent agents · CPC title

• F21S41/336

  with discontinuity at the junction between adjacent areas · CPC title