Laser medium, laser medium unit, and laser beam amplification device

Patent metadata

Field	Value
Publication number	US-10374377-B2
Application number	US-201615544613-A
Country	US
Kind code	B2
Filing date	Jan 13, 2016
Priority date	Jan 20, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A plate-like laser medium has a through-hole for providing a flow of a cooling medium. The laser medium unit includes the plurality of laser media. A laser beam amplification device includes a laser medium unit 10 , an excitation light source 21 that causes excitation light to enter the laser medium unit 10 , a through-hole 16 a of a window member as a unit for supplying the cooling medium in a through-hole 14 a of the laser medium 14 , and a cooling medium flow path F 1 arranged around the laser medium unit 10.

First claim

The invention claimed is:

1. A laser medium unit including laser media, each of the laser media is a plate-like laser medium comprising a through-hole for making a cooling medium pass through the through-hole, wherein excitation light enters the laser medium from an outer peripheral surface of the laser medium, wherein
a thickness of the plate-like laser medium is from 1 mm to 20 mm, inclusive,
the laser media are stacked in the thickness direction thereof,
a ring-shaped sealing material is interposed between adjacent laser media; and
the sealing material receives pressure in the stacking direction of the laser media.

2. The laser medium unit according to claim 1 , wherein
in a case where an XYZ three-dimensional orthogonal coordinate system is set and the stacking direction of the laser media is defined as the Y axis,
there are adjacent laser media respectively having through-holes of which positions in an XZ plane are different from each other.

3. A laser beam amplification device comprising:
the laser medium unit according to claim 1 ;
an excitation light source configured to cause excitation light to enter the laser medium unit;
a unit configured to supply a cooling medium in a through-hole of a plate-like laser medium of the laser media; and
a cooling medium flow path configured to be arranged around the laser medium unit;
wherein the plate-like laser medium comprises Yb-added YAG, and the added concentration of Yb in the laser medium is set from 0.1 atomic % to 10 atomic %, inclusive.

Assignees

• Hamamatsu Photonics Kk

Inventors

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

Classifications

• H01S3/0623

  Antireflective [AR] · CPC title

• H01S3/07

  consisting of a plurality of parts, e.g. segments (H01S3/067 takes precedence) · CPC title

• H01S3/025

  of solid state lasers, e.g. housings or mountings · CPC title

• H01S3/093

  focusing or directing the excitation energy into the active medium · CPC title

• H01S3/10

  Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating · CPC title