Laser beam amplification device

Patent metadata

Field	Value
Publication number	US-10063026-B2
Application number	US-201615543375-A
Country	US
Kind code	B2
Filing date	Jan 13, 2016
Priority date	Jan 19, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A laser medium unit 10 in a laser beam amplification device includes a plurality of laser media 14 . A cooling medium flow path F 1 is provided around the laser medium unit 10 to cool the laser medium unit 10 from outside. A sealed space between the laser media 14 is filled with gas or liquid, and a laser beam for passing through the sealed space is not interfered by a cooling medium flowing outside. Therefore, a fluctuation of an amplified laser beam is prevented, and a quality such as stability and focusing characteristics of the laser beam is improved.

First claim

The invention claimed is:

1. A laser beam amplification device comprising:
a laser medium unit;
an excitation light source configured to cause excitation light to enter the laser medium unit; and
a cooling medium flow path configured to be arranged around the laser medium unit,
wherein the laser beam amplification device amplifies and outputs a laser beam input to the laser medium unit;
wherein the laser medium unit comprises:
a plate-like first laser medium,
a plate-like second laser medium, and
a sealing material arranged between the first and the second laser media;
wherein the first and the second laser media are aligned along a thickness direction of the first and the second laser media; and
wherein a space between the first and the second laser media is a sealed space and is under a reduced pressure environment or is filled with gas.

2. The laser beam amplification device according to claim 1 , wherein
materials of the first and the second laser media are ceramic laser media.

3. The laser beam amplification device according to claim 1 , wherein
the laser medium unit includes a pair of flanges arranged opposed to each other and
three or more support columns for connecting the flanges and capable of adjusting a distance between the flanges,
an alignment direction of the first and the second laser media coincides with a longitudinal direction of the support column, and
a pressure to be applied to the sealing material is adjustable by adjusting the distance between the flanges.

4. A laser beam amplification device comprising:
a laser medium unit;
an excitation light source configured to cause excitation light to enter the laser medium unit; and
a cooling medium flow path configured to be arranged around the laser medium unit,
wherein the laser beam amplification device amplifies and outputs a laser beam input to the laser medium unit;
wherein the laser medium unit comprises:
a plate-like first laser medium,
a plate-like second laser medium, and
a sealing material arranged between the first and the second laser media;
wherein the first and the second laser media are aligned in a thickness direction of the first and the second laser media, and
a space between the first and the second laser media is a sealed space and is filled with heavy water or fluorine-based inert liquid.

Assignees

• Hamamatsu Photonics Kk

Inventors

• Sekine Takashi
• Kato Yoshinori
• TAMAOKI Yoshinori
• Kurita Takashi
• Kawashima Toshiyuki
• Morita Takaaki

Classifications

• H01S3/0623

  Antireflective [AR] · CPC title

• H01S3/0407 Primary

  Liquid cooling, e.g. by water · CPC title

• H01S3/102

  by controlling the active medium, e.g. by controlling the processes or apparatus for excitation (H01S3/13 takes precedence) · CPC title

• H01S3/092

  of flash lamp (H01S3/0937 takes precedence {; flash lamps per se H01J61/80; circuit arrangements for operating flash lamps in general H05B41/30}) · CPC title

• H01S3/1643

  YAG · CPC title