Integrated single grating compressor for variable pulse-front tilt in simultaneously spatially and temporally focused systems

Patent metadata

Field	Value
Publication number	US-10040146-B2
Application number	US-201514968633-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Dec 12, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A multipass chirped pulse amplification system outfitted with a single-grating, simultaneous spatial and temporal focusing (SSTF) compressor platform is provided. Such a system provides the ability to vary the beam aspect ratio of an SSTF beam, and thus the degree of pulse-front tilt at a focus, while maintaining a net zero-dispersion system. The optical system may include a first optical element or set of optical elements that receives and then varies a pulse-front tilt of a light beam, and a second optical element or set of optical elements that focuses the light beam having the varied pulse-front tilt that is output by the first optical element or set of optical elements. The first optical element or set of optical elements includes an optical grating, two dihedrals, and a retroflector roof mirror.

First claim

What is claimed is:

1. An optical system, comprising:
a first optical element or set of optical elements that receives and then varies a pulse-front tilt of a light beam, wherein the first optical element or set of optical elements includes at least two dihedral optical elements and adjusting a distance between each of the at least two dihedral optical elements and an optical grating varies the pulse-front tilt of the light beam, wherein the at least two dihedral optical elements are fixed to a common object, and wherein a distance between the common object and a first dihedral optical element of the at least two dihedral optical elements is greater than a distance between the common object and a second dihedral optical element of the at least two dihedral optical elements; and
a second optical element or set of optical elements that focuses a light beam having the varied pulse-front tilt that is output by the first optical element or set of optical elements.

2. The optical system of claim 1 , wherein the light beam enters and exits each dihedral optical element of the at least two dihedral optical elements only once.

3. The optical system of claim 1 , further including a roof mirror and an optical grating, wherein the light beam passes through the optical grating, enters and exits the first dihedral optical element, passes through the optical grating, enters and exits the roof mirror, passes through the optical grating, enters and exits the second dihedral optical element, and then passes through the optical grating.

4. The optical system of claim 3 , wherein the light beam enters and exits each dihedral optical element of the at least two dihedral optical elements only once and enters and exits the optical grating only four times.

5. The optical system of claim 1 , wherein adjusting a distance between the at least two dihedral optical elements varies the pulse-front tilt of the light beam while maintaining a predetermined dispersion compensation.

6. The optical system of claim 1 , wherein the pulse-front tilt is varied independently from a spatial chirp of the light beam.

7. The optical system of claim 1 , further comprising an interferometer configuration to measure a pulse width of the light beam, wherein the interferometer configuration includes at least one beamsplitter configured to split the light beam prior to the light beam entering the first optical element or set of optical elements.

8. The optical system of claim 1 , wherein the second optical element or set of optical elements outputs focused light that ablates a surface of an object.

9. A method, comprising:
receiving a light beam;
varying a pulse-front tilt of the light beam independently from a spatial chirp of the light beam by:
passing the light beam through an optical grating to a first dihedral optical element;
directing the light beam from the first dihedral optical element, through the optical grating, and to a retroreflecting roof mirror;
directing the light beam from the retroreflecting roof mirror, through the optical grating, and to a second dihedral optical element; and
directing the light beam from the second dihedral optical element, through the optical grating, to an optical element or set of optical elements that focuses the light beam having the varied pulse-front tilt; and

focusing the light beam having the varied pulse-front tilt at a focal plane.

10. The method of claim 9 , wherein varying the pulse-front tilt of the light beam includes adjusting a distance between the first dihedral optical element and the optical grating.

11. The method of claim 10 , wherein varying the pulse-front tilt of the light beam includes adjusting a distance between the second dihedral optical element and the optical grating.

12. The method of claim 9 , wherein the light beam enters and exits each of two dihedral optical elements only once.

13. The method of claim 9 , further comprising measuring a pulse width of the light beam at an interferometer.

14. The method of claim 9 , further comprising splitting the light beam into a first light beam and a second light beam prior to at least one of the first light beam, the second light beam, and/or the light beam entering the first dihedral optical element.

15. The method of claim 14 , wherein a second optical element or second set of optical elements cause the pulse-front tilt to vary, and wherein the second optical element or second set of optical elements include the optical grating, the first dihedral optical element, the second dihedral optical element, and the retroreflecting roof mirror.

16. An optical system, comprising:
a first set of optical elements that receives and then varies a pulse-front tilt of a light beam, the first set of optical elements including:
a first dihedral optical element,
a second dihedral optical element, wherein the first dihedral optical element and the second dihedral optical element are fixed to a common object, and wherein a distance between the common object and the first dihedral optical element is greater than a distance between the common object and the second dihedral optical element, and
a retroreflecting roof mirror; and

a second optical element or set of optical elements that focuses the light beam having the varied pulse-front tilt that is output by the first set of optical elements,
wherein adjusting a distance between the first dihedral optical element and an optical grating and a distance between the second dihedral optical element and the optical grating varies the pulse-front tilt of the light beam, and
wherein the light beam includes femtosecond laser pulses.

Assignees

• Colorado School Of Mines

Inventors

• Squier Jeff A
• Block Erica K

Classifications

• H01S3/2325

  Multi-pass amplifiers, e.g. regenerative amplifiers · CPC title

• G01B11/00

  Measuring arrangements characterised by the use of optical techniques · CPC title

• B23K26/362 Primary

  Laser etching · CPC title

• H01S3/0057 Primary

  Temporal shaping, e.g. pulse compression, frequency chirping (soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108) · CPC title