US 10,094,707 B2Granted

Optical attenuator

AssigneeNissan Motor Co., Ltd.

InventorsNaoyuki Morimiya, Naoyuki Torii, Naoki Okamoto, Naoya Yoshida, Tsuneo Saito

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Abstract

An optical attenuator has a sampling prism, a biconcave lens and an absorption member. A branch member splits a laser beam. An expansion member expands the shape of the split laser beam. The absorption member absorbs the energy of the expanded laser beam. A light receiving part of the absorption member receives the expanded laser beam. A first distribution part of the absorption member adjacent to the light receiving part, introduces or leads out a medium (cooling water) from a first opening and distributes the medium, which absorbs heat generated in the light receiving part by the laser beam. A second distribution part of the absorption member leads out or introduces cooling water from a second opening, and distributes the cooling water, which moves through a communicating part that communicates with the first distribution part.

Claims20

Dependent claims

An optical attenuator comprising:

a branch member that splits light to be measured into split light;
an expansion member that expands a shape of the split light into expanded light;
and
an absorption member that absorbs energy of the expanded light,
the absorption member comprising:
a light receiving part that receives the expanded light,
a first distribution part disposed adjacent to the light receiving part and that introduces or leads out a medium from a first opening and that distributes the medium to absorb heat generated in the light receiving part by the light;
and
a second distribution part that leads out or introduces the medium from a second opening and distributes the medium through a communicating part that communicates with the first distribution part, the communicating portion being disposed in a portion where the first distribution part and the second distribution part are adjacent to each other,
the medium being introduced from one of the first and second openings and leading out from the other of the first and second openings.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/549,713Filed 9 Feb 2016
Priority: JP 2015-05098813 Mar 2015
Published: US 2018/0031417 A11 Feb 2018
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01J 1/0418
Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings: using attenuators
H01S 3/0071
Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser…
G01J 1/02
Photometry, e.g. photographic exposure meter: details
G02B 5/003
Optical elements other than lenses: light absorbing elements