JP6219258B2 - レーザ装置、及び光音響計測装置 - Google Patents
レーザ装置、及び光音響計測装置 Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—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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- 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
- H01S3/0619—Coatings, e.g. AR, HR, passivation layer
- H01S3/0621—Coatings on the end-faces, e.g. input/output surfaces of the laser light
- H01S3/0623—Antireflective [AR]
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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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08054—Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—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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- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/107—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using electro-optic devices, e.g. exhibiting Pockels or Kerr effect
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/163—Solid materials characterised by a crystal matrix
- H01S3/1631—Solid materials characterised by a crystal matrix aluminate
- H01S3/1633—BeAl2O4, i.e. Chrysoberyl
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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
- H01S2301/00—Functional characteristics
- H01S2301/06—Gain non-linearity, distortion; Compensation thereof
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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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
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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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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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
- H01S3/10061—Polarization control
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- Optics & Photonics (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Acoustics & Sound (AREA)
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- Animal Behavior & Ethology (AREA)
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- Veterinary Medicine (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Description
11:レーザロッド
12:フラッシュランプ
13:レーザチャンバ
13a:第1の部分
13b:第2の部分
14、15:ミラー
16:Qスイッチ
17:偏光子
18:プリズム
19:筐体
20:遮蔽蓋
21:薄膜部分
22:絶縁ブロック
23:絶縁部材
30:冷却機器
31、32:配管
100:光音響計測装置
101:プローブ
102:超音波ユニット
103:画像表示手段
121:受信回路
122:AD変換手段
123:受信メモリ
124:データ分離手段
125:光音響画像生成手段
126:超音波画像生成手段
127:画像合成手段
128:制御手段
129:送信制御回路
171:ガラス板
172:分離膜
Claims (13)
- アレキサンドライト結晶を含むレーザロッドと、
前記レーザロッドに励起光を照射する励起光源と、
前記レーザロッドを挟み込む一対のミラーを含む共振器と、
前記共振器の光路内に挿入され、前記共振器のQ値を制御するQスイッチと、
前記レーザロッドと前記Qスイッチとの間及び前記レーザロッドと前記一対のミラーのうちの一方との間の少なくとも一方に挿入され、前記レーザロッドから出射した光のうち偏光方向が所定方向の光を選択的に透過するノンコートのブリュースター型の偏光子とを備え、
前記Qスイッチがポッケルスセルを含み、該ポッケルスセルへの印加電圧が第1の電圧のとき、前記共振器のQ値がレーザ発振しきい値より高くなり、印加電圧が前記第1の電圧よりも高い第2の電圧のとき、前記共振器のQ値がレーザ発振しきい値以下となり、
投入エネルギーが20Jのとき、前記第2の電圧の範囲が0.5kV以上であることを特徴とするレーザ装置。 - 前記共振器の光路は、該共振器の範囲内において密閉される請求項1記載のレーザ装置。
- 前記レーザロッド及び前記Qスイッチの少なくとも一方が、光入射端に反射防止膜を有する請求項1又は2記載のレーザ装置。
- 前記第1の電圧が0Vであり、前記第2の電圧が前記ポッケルスセルを1/4波長板として働かせる電圧である請求項1から3いずれか1項記載のレーザ装置。
- 前記偏光子が、前記レーザロッドから出射した光の光軸に対してブリュースター角で配置されたガラス板で構成される請求項1から4いずれか1項記載のレーザ装置。
- 投入エネルギーが20Jのとき、レーザの出力エネルギーが140mJ以上である請求項1から5いずれか1項記載のレーザ装置。
- 前記偏光子が、前記レーザロッドと前記一対のミラーのうちの出力側のミラーとの間に挿入される請求項1から6いずれか1項記載のレーザ装置。
- 前記偏光子が、前記レーザロッドと前記Qスイッチとの間及び前記レーザロッドと前記一対のミラーのうちの一方との間の双方に挿入される請求項1から6いずれか1項記載のレーザ装置。
- アレキサンドライト結晶を含むレーザロッドと、
前記レーザロッドに励起光を照射する励起光源と、
前記レーザロッドを挟み込む一対のミラーを含む共振器と、
前記共振器の光路内に挿入され、前記共振器のQ値を制御するQスイッチと、
前記レーザロッドと前記Qスイッチとの間及び前記レーザロッドと前記一対のミラーのうちの一方との間の少なくとも一方に挿入され、前記レーザロッドから出射した光のうち偏光方向が所定方向の光を選択的に透過する偏光子ブリュースター型の偏光子であって、偏光方向が前記所定方向の光と偏光方向が前記所定方向と直交する方向の光とを分離する膜を有するブリュースター型の偏光子とを備え、
前記Qスイッチがポッケルスセルを含み、該ポッケルスセルへの印加電圧が第1の電圧のとき、前記共振器のQ値がレーザ発振しきい値よりも高くなり、印加電圧が前記第1の電圧よりも高い第2の電圧のとき、前記共振器のQ値がレーザ発振しきい値以下となり、
投入エネルギーが20Jのとき、前記第2の電圧の範囲が2.5kV以上であることを特徴とするレーザ装置。 - 投入エネルギーが20Jのとき、レーザの出力エネルギーが140mJ以上である請求項9記載のレーザ装置。
- 前記一対のミラーを構成する出力ミラーの反射率が70%以上である請求項1から10いずれか1項記載のレーザ装置。
- 前記レーザロッドの長さが、70mm以下である請求項1から11いずれか1項記載のレーザ装置。
- 請求項1から12いずれか1項記載のレーザ装置と、
前記レーザ装置から出射したレーザ光が被検体に照射された後に被検体内で生じた光音響波を検出する光音響波検出手段と、
前記検出された光音響波に基づいて信号処理を実施する信号処理手段とを備えたことを特徴とする光音響計測装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2014216083A JP6219258B2 (ja) | 2013-10-31 | 2014-10-23 | レーザ装置、及び光音響計測装置 |
EP14858991.4A EP3065234B1 (en) | 2013-10-31 | 2014-10-27 | Laser device and photoacoustic measurement device |
PCT/JP2014/078448 WO2015064520A1 (ja) | 2013-10-31 | 2014-10-27 | レーザ装置、及び光音響計測装置 |
CN201480059016.8A CN105723577B (zh) | 2013-10-31 | 2014-10-27 | 激光装置及光声测量装置 |
US15/095,567 US10243317B2 (en) | 2013-10-31 | 2016-04-11 | Laser device and photoacoustic measurement device |
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JP2014216083A JP6219258B2 (ja) | 2013-10-31 | 2014-10-23 | レーザ装置、及び光音響計測装置 |
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JP2015111660A JP2015111660A (ja) | 2015-06-18 |
JP6219258B2 true JP6219258B2 (ja) | 2017-10-25 |
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EP (1) | EP3065234B1 (ja) |
JP (1) | JP6219258B2 (ja) |
CN (1) | CN105723577B (ja) |
WO (1) | WO2015064520A1 (ja) |
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CN202260121U (zh) * | 2011-09-22 | 2012-05-30 | 西安炬光科技有限公司 | 一种多波长高功率半导体激光器光源系统 |
JP2013074180A (ja) | 2011-09-28 | 2013-04-22 | Fujifilm Corp | 固体レーザ発振器およびそれに用いられるレーザチャンバ並びにレーザを利用した装置 |
JP2013089680A (ja) * | 2011-10-14 | 2013-05-13 | Canon Inc | レーザー装置およびその制御方法 |
JP2013111432A (ja) * | 2011-12-01 | 2013-06-10 | Fujifilm Corp | 光音響画像生成装置および光音響画像生成方法 |
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