Object information acquiring apparatus and laser apparatus

Patent metadata

Field	Value
Publication number	US-9585570-B2
Application number	US-201414306390-A
Country	US
Kind code	B2
Filing date	Jun 17, 2014
Priority date	Jun 26, 2013
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An object information acquiring apparatus is used which includes: a laser medium; a temperature controlling unit for controlling a temperature of the laser medium; an excitation unit for exciting the laser medium; a control unit for controlling the temperature controlling unit and the excitation unit; a probe for receiving acoustic waves that are generated when an object is irradiated with a laser beam from the laser medium; and a processing unit for acquiring characteristic information relating to the object from the acoustic waves, wherein the control unit does not operate the excitation unit until the temperature of the laser medium falls within a predetermined range.

First claim

What is claimed is:

1. A laser apparatus, comprising:
a laser medium;
temperature controlling means configured to control a temperature of said laser medium, and including a circulator circulating a substance near said laser medium to heat the laser medium, and heating means heating said substance circulating within said circulator;
excitation means configured to excite said laser medium;
control means configured to control said temperature controlling means and said excitation means;
first temperature measuring means configured to measure the temperature of said laser medium; and
second temperature measuring means configured to measure a temperature of said substance circulating within said circulator,
wherein said control means does not activate said excitation means until the temperature of said substance circulating within said circulator, measured by said second temperature measuring means, reaches a first value, and activates said heating means until the temperature of said laser medium, measured by said first temperature measuring means, reaches a second value different from said first value,
wherein a current to flow to said heating means after the temperature of said substance circulating within said circulator, measured by said second temperature measuring means, reaches the first value and until the temperature of said laser medium, measured by said first temperature measuring means, reaches the second value, is smaller than a current to flow to said heating means until the temperature of said substance circulating within said circulator, measured by said second temperature measuring means, reaches the first value.

2. The laser apparatus according to claim 1 , wherein said second value is higher than said first value.

3. The laser apparatus according to claim 1 , further comprising:
a light intensity measuring means configured to measure a light intensity of a laser beam,
wherein said light intensity measuring means measures the light intensity of the laser beam after said control means activates said excitation means and before an object is irradiated with the laser beam.

4. The laser apparatus according to claim 3 , wherein, if the light intensity of the laser beam measured by said light intensity measuring means in a prescribed period is within a predetermined range, said control means stops light emission of the excitation means until an object is prepared.

5. The laser apparatus according to claim 3 , wherein, if the light intensity of the laser beam measured by said light intensity measuring means in a prescribed period is not within a predetermined range, said control means provides notification of an error.

6. The laser apparatus according to claim 1 , wherein said control means performs control so that peaks of power consumption of said heating means do not overlap with peaks of power consumption of said excitation means.

7. The laser apparatus according to claim 1 , wherein said excitation means is a flash lamp, and
wherein said control means causes simmer current to flow to said flash lamp if preparation time of the object is equal to or shorter than a predetermined period, and stops the simmer current if the preparation time of the object is longer than the predetermined period.

8. The laser apparatus according to claim 1 , wherein said laser medium comprises alexandrite.

9. An object information acquiring apparatus, comprising:
said laser apparatus according to claim 1 ;
a probe configured to receive acoustic waves that are generated when an object is irradiated with the laser beam from said laser apparatus; and
processing means configured to acquire characteristic information relating to the object in use of the acoustic waves.

Assignees

• Canon Kk

Inventors

• Suzuki Koichi

Classifications

• H01S3/115

  using intracavity electro-optic devices · CPC title

• H01S3/042

  for solid state lasers {(H01S3/0401 takes precedence)} · CPC title

• H01S3/0407

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

• H01S3/0404

  Air- or gas cooling, e.g. by dry nitrogen · CPC title

• A61B5/14542

  for measuring blood gases (A61B5/14551 takes precedence) · CPC title