Broadband laser source for laser thermal processing and photonically activated processes

Patent metadata

Field	Value
Publication number	US-9762021-B2
Application number	US-201514857975-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Nov 18, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A laser that emits light at all available frequencies distributed throughout the spectral bandwidth or emission bandwidth of the laser in a single pulse or pulse train is disclosed. The laser is pumped or seeded with photons having frequencies distributed throughout the superunitary gain bandwidth of the gain medium. The source of photons is a frequency modulated photon source, and the frequency modulation is controlled to occur in one or more cycles timed to occur within a time scale for pulsing the laser.

First claim

What is claimed is:

1. A broadband optical amplifier assembly comprising:
a seed photon source;
a gain medium optically coupled to the seed photon source, wherein the seed photon source is operable to emit photons having a plurality of frequencies distributed throughout a superunitary gain bandwidth of the gain medium; and
one or more reflectors optically coupled to the gain medium, wherein:
at least one of the reflectors is a partial-ellipsoid reflector;
the seed photon source is a light-emitting diode positioned at a first focus of the partial-ellipsoid reflector; and
a centroid of the gain medium is at a second focus of the partial-ellipsoid reflector.

2. The broadband optical amplifier assembly of claim 1 , wherein the broadband optical amplifier assembly is a laser.

3. The broadband optical amplifier assembly of claim 1 , wherein the seed photon source is at least one of a frequency modulated source, a polarization modulated source, a tunable wavelength laser, a chirped laser, a pulsed fiber laser, a highly divergent source, a diode laser, a diode laser array, a light-emitting diode, and a broadband emitter having an emission spectrum that includes all of the superunitary gain band of the gain medium.

4. The broadband optical amplifier assembly of claim 1 , wherein the plurality of frequencies of the emitted seed photons are evenly distributed throughout the superunitary gain bandwidth of the gain medium.

5. The broadband optical amplifier assembly of claim 1 , wherein the broadband optical amplifier assembly is configured to emit pulses of photons having a short coherence length.

6. The broadband optical amplifier assembly of claim 5 , wherein the coherence length is less than about 2 cm.

7. The broadband optical amplifier assembly of claim 1 , wherein each of the reflectors is at least one of a metal mirror, a dielectric mirror, and a Bragg mirror.

8. The broadband optical amplifier assembly of claim 1 , wherein the gain medium is positioned between two at-least-partial reflectors.

9. The broadband optical amplifier assembly of claim 8 , wherein:
one of the at-least-partial reflectors is curved;
the curved reflector is a full reflector; and
the curved reflector has an aperture for admitting light from the seed photon source.

Assignees

• Applied Materials Inc

Inventors

• Moffatt Stephen

Classifications

• H01S5/0622

  Controlling the frequency of the radiation · CPC title

• H01S3/2375

  Hybrid lasers (H01S3/07 takes precedence) · CPC title

• H01S3/1643

  YAG · CPC title

• H01S3/1611

  neodymium · CPC title

• H01S3/10092 Primary

  Coherent seed, e.g. injection locking · CPC title