Monolithic pulse compressor and associated adjustment method

Patent metadata

Field	Value
Publication number	US-12306454-B2
Application number	US-202117563088-A
Country	US
Kind code	B2
Filing date	Dec 28, 2021
Priority date	Jul 2, 2019
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A pulse compressor includes a plurality of optical components. The plurality of optical components includes a diffraction grating. A first optical component of the optical components is fastened to base plate by at least first and second intermediate elements that are laser-welded to one another. The first intermediate element is fastened to the base plate and the second intermediate element is fastened to the optical component. A joining surface of the first and second intermediate elements is formed as a bearing recess and another joining surface is curved. At least the laser-welded joining surfaces of the first optical component, the base plate, and the first and second intermediate elements are formed from materials for which a difference in their coefficients of thermal expansion is less than 10e-6/K.

First claim

What is claimed is:

1. A pulse compressor comprising:
a plurality of optical components, the plurality of optical components including a diffraction grating,
wherein a first optical component of the optical components is fastened to a base plate by at least a first intermediate element and a second intermediate element that are laser-welded to one another at a first joining surface of the first intermediate element and a second joining surface of the second intermediate element,
wherein the first intermediate element is integral with the base plate or is laser-welded to the base plate at a third joining surface of the first intermediate element and a joining surface of the base plate, and the second intermediate element is laser-welded to the optical component at a fourth joining surface of the second intermediate element and a joining surface of the optical component,
wherein one of the first joining surface of the first intermediate element and the second joining surface of the second intermediate element is formed as a bearing recess, and another one of the first joining surface and the second joining surface is curved, and
wherein at least the joining surface of the first optical component, the joining surface of the base plate, the first joining surface and the third joining surface of the first intermediate element, and the second joining surface and the fourth joining surface of the second intermediate element are formed from materials for which a difference in their coefficients of thermal expansion is less than 10e −6 /K.

2. The pulse compressor as claimed in claim 1 , wherein at least one additional optical component of the optical components is fastened to the base plate by at least two additional intermediate elements which are laser-welded to the additional optical component and/or to the base plate, wherein a joining surface the at least one additional optical component, the joining surface of the base plate, and joining surfaces of the at least two additional intermediate elements are formed from materials for which a difference in their coefficients of thermal expansion is less than 10e −6 /K.

3. The pulse compressor as claimed in claim 1 , wherein the joining surface of the first optical component, the joining surface of the base plate, the first joining surface and the third joining surface of the first intermediate element, and the second joining surface and the fourth joining surface of the second intermediate element are formed from a same material.

4. The pulse compressor as claimed in claim 3 , wherein at least the joining surface of the first optical component, the joining surface of the base plate, the first joining surface and the third joining surface of the first intermediate element, and the second joining surface and the fourth joining surface of the second intermediate element are formed from quartz glass or quartz crystal.

5. The pulse compressor as claimed in claim 1 , wherein the first optical component, the base plate, the first intermediate element, and the second intermediate element are formed completely from a same material.

6. The pulse compressor as claimed in claim 5 , wherein the first optical component, the base plate, and/or the first intermediate element and the second intermediate element are formed completely from quartz glass or quartz crystal.

7. The pulse compressor as claimed in claim 1 , wherein the joining surface of the first optical component is formed on a substrate of the first optical component.

8. The pulse compressor as claimed in claim 1 , wherein the fourth joining surface of the second intermediate element is flat and lies against the optical component, and/or the third joining surface of the first intermediate element is flat and lies against the base plate.

9. The pulse compressor as claimed in claim 1 , wherein the first joining surface of the first intermediate element, which lies against the second joining surface of the second intermediate element, is formed as a conical surface, and the second joining surface of the second intermediate element that lies against the first intermediate element is convexly curved.

10. The pulse compressor as claimed in claim 1 , wherein the first optical component, the first intermediate element, the second intermediate element, and the base plate are laser-welded to one another over an entire length of a joining line.

11. The pulse compressor as claimed in claim 1 , wherein the first optical component is fastened to the base plate additionally by a third intermediate element, wherein the first intermediate element, the second intermediate element, and the third intermediate element are laser-welded to one another, wherein the third intermediate element is laser-welded to the base plate.

12. The pulse compressor as claimed in claim 11 , wherein the first joining surface of the first intermediate element and a fifth joining surface of the third intermediate element that lie against the second intermediate element are curved, and/or the second joining surface of the second intermediate element that lies against the first intermediate element and the third intermediate elements is curved.

13. A method for adjusting and fastening at least a first optical component of a pulse compressor comprising multiple optical components, at least one of which is a diffraction grating, on a base plate of the pulse compressor, the method comprising:
adjusting and fastening the first optical component by:
laser welding a first intermediate element to the base plate at a first joining surface of the first intermediate element and a joining surface of the base plate;
laser welding a second intermediate element to the first optical component at a second joining surface of the second intermediate element and a joining surface of the first optical component;
positioning the second intermediate element with the first optical component laser-welded thereto against the first intermediate element with the base plate laser-welded thereto;
adjusting the first optical component into a desired tilting position with respect to the base plate by turning the second intermediate element with respect to the first intermediate element; and
laser welding the first intermediate element and to the second intermediate element in the desired tilting position at a third joining surface of the first intermediate element and a fourth joining surface of the second intermediate element; or

adjusting and fastening the first optical component by:
laser welding the second intermediate element to the first optical component at the second joining surface of the second intermediate element and the joining surface of the first optical component;
positioning the second intermediate element with the first optical component laser-welded thereto against the first intermediate element;
placing the first intermediate element on the base plate;
adjusting the first optical component into the desired tilting position in relation to the first intermediate element by turning the second intermediate element with respect to the first intermediate element;
laser welding the first intermediate element and the second intermediate element in the desired tilting position at the third joining surface of the first intermediate element and the fourth joining surface of the second intermediate element;
adjusting the first optical component on the base plate into a desired position with respect to the base plate by moving the first intermediate element with respect to the base plate; and
laser welding the first intermediate element to the base plate in the desired position at the first joining surface of the first intermediate e

Assignees

• Trumpf Laser Gmbh

Inventors

• Bauer Dominik
• Budnicki Aleksander
• Scelle Raphael
• Scharun Michael

Classifications

• H01S3/1106

  Mode locking · CPC title

• H01S3/067

  Fibre lasers · CPC title

• H01S3/0057

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

• G02B5/18

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• B23K26/21

  by welding · CPC title