JP5938362B2 - 光音響計測装置及びレーザ装置 - Google Patents
光音響計測装置及びレーザ装置 Download PDFInfo
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- 238000003780 insertion Methods 0.000 description 4
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- A61B5/0095—Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy by applying light and detecting acoustic waves, i.e. photoacoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2418—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
- H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/115—Q-switching using intracavity electro-optic devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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- Heart & Thoracic Surgery (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Description
11:プローブ
12:超音波ユニット
13:レーザ光源ユニット
21:受信回路
22:光音響画像生成手段
23:制御回路
31:レーザロッド
32:フラッシュランプ
33、34:ミラー
35:Qスイッチ
36:励起チャンバ
37:フラッシュランプ電源部
38:Qスイッチドライバ
39:光路遮断器
40:遮断器閉検出器
Claims (9)
- レーザ媒質と、
前記レーザ媒質を励起する励起手段と、
前記レーザ媒質を挟んで対向する一対のミラーを含む光共振器と、
前記光共振器の光路上に配置され、印加電圧に応じて前記光共振器の光損失を変化させるQスイッチであって、印加電圧が第1の電圧レベルのときの前記光共振器の光損失を、前記Qスイッチへの印加電圧が前記第1の電圧レベルよりも低い第2の電圧レベルのときの前記光共振器の光損失よりも大きくするQスイッチと、
レーザ出射光の光路上に配置された光路遮断器とを有するレーザ光源と、
前記レーザ光源からの光が被検体に出された後に、該光出射に起因して発生した光音響波を検出する音響波検出手段と、
前記光音響波を信号処理する光音響信号処理手段と、
レーザ出射を行う第1の動作モード時は、前記光路遮断器が開かれた状態で、かつ前記励起手段によるレーザ媒質の励起後に、前記Qスイッチへの印加電圧を前記第1の電圧レベルから前記第2の電圧レベルに変化させることでパルスレーザ光の出射を行い、レーザ出射を中断して待機する第2の動作モード時は、前記光路遮断器が閉じられた状態で、前記Qスイッチへの印加電圧を前記第2の電圧レベルとする制御手段とを備え、
前記レーザ光源が、前記光路遮断器が閉じられていることを検出する遮断器閉検出器を更に有し、前記制御手段が、前記遮断器閉検出器で前記光路遮断器が閉じられていることが検出されている場合に、前記Qスイッチへの印加電圧を第2の電圧レベルに制御することを特徴とする光音響計測装置。 - 前記第2の動作モードでは、前記励起手段が周期的にレーザ媒質の励起を行う請求項1に記載の光音響計測装置。
- 前記第2の電圧レベルが0Vである請求項1又は2に記載の光音響計測装置。
- 前記Qスイッチが、印加電圧が第1の電圧レベルのとき透過光の光学軸に平行な偏光成分と垂直な偏光成分との間に所定の位相差を与え、かつ印加電圧が前記第2の電圧レベルのときは透過光の光学軸に平行な偏光成分と垂直な偏光成分との間に位相差を与えない請求項1から3何れか1項に記載の光音響計測装置。
- 前記Qスイッチが、印加電圧が第1の電圧レベルのときレーザ光の波長の光に対して1/4波長板として機能する請求項1から4何れか1項に記載の光音響計測装置。
- 前記光音響信号処理手段が、前記光音響信号に基づいて光音響画像を生成する請求項1から5何れか1項に記載の光音響計測装置。
- 前記光音響信号の計測が指示されると前記第1の動作モードで動作し、前記光音響信号の計測停止が指示されると、前記第2の動作モードで動作する請求項1から6何れか1項に記載の光音響計測装置。
- 前記制御手段が、前記第1の動作モード時は、前記Qスイッチへの印加電圧を前記第1の電圧レベルから前記第2の電圧レベルに変化させた後に、前記Qスイッチへの印加電圧を前記第1の電圧レベルとする請求項1から7何れか1項に記載の光音響計測装置。
- レーザ媒質と、
前記レーザ媒質を励起する励起手段と、
前記レーザ媒質を挟んで対向する一対のミラーを含む光共振器と、
前記光共振器の光路上に配置され、印加電圧に応じて前記光共振器の光損失を変化させるQスイッチであって、印加電圧が第1の電圧レベルのときの前記光共振器の光損失を、前記Qスイッチへの印加電圧が前記第1の電圧レベルよりも低い第2の電圧レベルのときの前記光共振器の光損失よりも大きくするQスイッチと、
レーザ出射光の光路上に配置された光路遮断器と、
前記光路遮断器が閉じられていることを検出する遮断器閉検出器を有し、
レーザ出射を行う第1の動作モード時は、前記光路遮断器が開かれた状態で、かつ前記励起手段によるレーザ媒質の励起後に、前記Qスイッチへの印加電圧を前記第1の電圧レベルから前記第2の電圧レベルに変化させることでパルスレーザ光の出射を行い、
レーザ出射を中断して待機する第2の動作モード時は、前記遮断器閉検出器で前記光路遮断器が閉じられていることが検出されている状態で、前記Qスイッチへの印加電圧を前記第2の電圧レベルとすることを特徴とするレーザ光源。
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JP2013061502A JP5938362B2 (ja) | 2013-03-25 | 2013-03-25 | 光音響計測装置及びレーザ装置 |
PCT/JP2014/057064 WO2014156749A1 (ja) | 2013-03-25 | 2014-03-17 | 光音響計測装置及びレーザ光源 |
US14/801,533 US9743840B2 (en) | 2013-03-25 | 2015-07-16 | Photoacoustic measurement device and laser light source |
US15/655,097 US10105063B2 (en) | 2013-03-25 | 2017-07-20 | Photoacoustic measurement device and laser light source |
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JP6556509B2 (ja) * | 2015-06-16 | 2019-08-07 | Cyberdyne株式会社 | 光音響画像化装置および光源ユニット |
JP6595703B2 (ja) * | 2016-03-30 | 2019-10-23 | 富士フイルム株式会社 | レーザ装置および光音響計測装置 |
WO2021068212A1 (zh) * | 2019-10-11 | 2021-04-15 | 深圳市大疆创新科技有限公司 | 一种光发射装置及测距装置、移动平台 |
US20230238766A1 (en) * | 2022-01-27 | 2023-07-27 | Sciaps, Inc. | Dual beam single spatial mode laser for handheld libs instruments and similar applications |
CN114739872A (zh) * | 2022-03-29 | 2022-07-12 | 安徽理工大学 | 一种本安防爆型光声光谱粉尘检测装置 |
US20240085324A1 (en) * | 2022-09-08 | 2024-03-14 | Femtometrix, Inc. | Method and apparatus for main detector synchronization of optically based second harmonic generation measurements |
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JPS63211782A (ja) * | 1987-02-27 | 1988-09-02 | Canon Inc | レ−ザ−装置 |
JPH04351280A (ja) * | 1990-12-26 | 1992-12-07 | Mid:Kk | 薄膜精密加工用のyagレーザ加工機 |
DE19747180A1 (de) * | 1997-10-24 | 1999-07-22 | Coherent Luebeck Gmbh | Pulslaser mit Erstpulssteuerung |
JP2003017787A (ja) * | 2001-07-04 | 2003-01-17 | Toshiba Corp | 固体レーザ装置及びqスイッチドライバの駆動回路 |
US20030187319A1 (en) * | 2002-03-29 | 2003-10-02 | Olympus Optical Co., Ltd. | Sentinel lymph node detecting apparatus, and method thereof |
US20060184042A1 (en) * | 2005-01-22 | 2006-08-17 | The Texas A&M University System | Method, system and apparatus for dark-field reflection-mode photoacoustic tomography |
US20060289411A1 (en) * | 2005-06-24 | 2006-12-28 | New Wave Research | Laser system with multiple operating modes and work station using same |
US8184667B2 (en) * | 2007-08-29 | 2012-05-22 | National Tsing Hua University | Electro-optic Bragg deflector and method of using it as laser Q-switch in an actively Q-switched laser and an actively Q-switched wavelength-conversion laser |
JP5700950B2 (ja) | 2010-04-21 | 2015-04-15 | キヤノン株式会社 | 生体情報取得装置 |
JP2012173246A (ja) | 2011-02-24 | 2012-09-10 | Fujifilm Corp | 光音響画像化装置 |
JP5995414B2 (ja) * | 2011-06-20 | 2016-09-21 | キヤノン株式会社 | レーザー装置 |
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US20170319078A1 (en) | 2017-11-09 |
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US10105063B2 (en) | 2018-10-23 |
JP2014184023A (ja) | 2014-10-02 |
US20150325971A1 (en) | 2015-11-12 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |