JP6595702B2 - レーザ装置および光音響計測装置 - Google Patents
レーザ装置および光音響計測装置 Download PDFInfo
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- JP6595702B2 JP6595702B2 JP2018508594A JP2018508594A JP6595702B2 JP 6595702 B2 JP6595702 B2 JP 6595702B2 JP 2018508594 A JP2018508594 A JP 2018508594A JP 2018508594 A JP2018508594 A JP 2018508594A JP 6595702 B2 JP6595702 B2 JP 6595702B2
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- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
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- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
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- A61B5/6813—Specially adapted to be attached to a specific body part
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- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4416—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to combined acquisition of different diagnostic modalities, e.g. combination of ultrasound and X-ray acquisitions
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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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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- 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
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- 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
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- H01S3/1633—BeAl2O4, i.e. Chrysoberyl
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Description
10 光音響計測装置
11 プローブ
12 超音波ユニット
13 レーザ光源ユニット
14 画像表示部
21 受信回路
22 AD変換部
23 受信メモリ
24 データ分離部
25 光音響画像生成部
26 超音波画像生成部
27 画像合成部
28 制御部
29 送信制御回路
50 レーザチャンバ
51 レーザロッド
52 フラッシュランプ
53 第1のミラー
54 第2のミラー
55 Q値変更部
56 Qスイッチ
57 偏光子
58 Qスイッチ駆動部
58a 高電圧源
58b 第1のスイッチ
58c 第2のスイッチ
58d 抵抗素子
58e 容量素子
59 励起光源電源部
60 制御部
61 記憶部
62 入力部
63 表示部
70 光検出器
70 光検出部
L パルスレーザ光
T 遅延時間
Claims (12)
- 励起光を出射する励起光源と、
前記励起光源から出射された前記励起光の照射を受けてレーザ光を出射するレーザ媒質と、
前記レーザ媒質を挟み込む一対のミラーを含み、前記一対のミラー間で前記レーザ光を共振させてパルスレーザ光を出射する共振器と、
前記共振器の光路内に配置され、印加電圧に応じて前記共振器のQ値を変化させるQスイッチであって、第1の電圧が印加された場合の前記共振器のQ値を、前記第1の電圧とは異なる第2の電圧が印加された場合の前記共振器のQ値よりも低くするQスイッチと、
前記Qスイッチに前記第1の電圧および前記第2の電圧を印加して前記Qスイッチを駆動するQスイッチ駆動部と、
前記励起光源および前記Qスイッチ駆動部を制御し、前記Qスイッチへの印加電圧が前記第1の電圧の場合に前記レーザ媒質に前記励起光を照射させ、前記励起光の照射後に、前記Qスイッチへの印加電圧を前記第1の電圧から前記第2の電圧に変化させることで前記パルスレーザ光を前記共振器から出射させる制御部とを備え、
前記制御部は、前記第1の電圧の印加によって前記Qスイッチを振動させ、前記第1の電圧の印加から予め定められた時間が経過した後に前記励起光の照射を開始し、前記励起光の照射開始から予め設定された遅延時間が経過した時点において前記Qスイッチに前記第2の電圧を印加し、
前記遅延時間は、前記Qスイッチの振動が継続している期間内であり、かつ前記Qスイッチに対する前記第2の電圧の印加時点を変化させた場合に、前記Qスイッチの振動に起因して周期的に変化する前記パルスレーザ光の強度が最大となる時間に設定されているレーザ装置。 - 前記制御部は、前記励起光の出射開始タイミングと同時に前記Qスイッチに対する前記第1の電圧の印加を開始する請求項1記載のレーザ装置。
- 前記第1の電圧は、前記第2の電圧よりも高い電圧である請求項1または2記載のレーザ装置。
- 前記第1の電圧の立ち上がり時間は、2μs以下である請求項1から3いずれか1項記載のレーザ装置。
- 前記第1の電圧の立ち上がり時間は、1μs以下である請求項4記載のレーザ装置。
- 前記遅延時間の変更を受け付ける遅延時間変更部を備えた請求項1から5いずれか1項記載のレーザ装置。
- 前記Qスイッチの振動に起因する前記パルスレーザ光の強度の周期的な変化が予め記憶された記憶部を備えた請求項1から6いずれか1項記載のレーザ装置。
- 前記記憶部に記憶された前記パルスレーザ光の強度の周期的な変化を表示部に表示させる表示制御部を備えた請求項7記載のレーザ装置。
- 前記パルスレーザ光の強度の周期的な変化を検出する光検出部を備えた請求項1から8いずれか1項記載のレーザ装置。
- 請求項1から9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されたパルスレーザ光の被検体への照射によって前記被検体内に発生した光音響波を検出して光音響波信号を出力するプローブとを備える光音響計測装置。 - 前記プローブから出力された光音響波信号に基づいて光音響画像を生成する音響画像生成部を備えた請求項10記載の光音響計測装置。
- 前記プローブは、前記被検体に対して送信された音響波の反射波を検出して反射波信号を出力し、
前記音響画像生成部は、前記反射波信号に基づいて反射音響画像を生成する請求項11記載の光音響計測装置。
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JP2016067328 | 2016-03-30 | ||
JP2016067328 | 2016-03-30 | ||
PCT/JP2017/006701 WO2017169336A1 (ja) | 2016-03-30 | 2017-02-23 | レーザ装置および光音響計測装置 |
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JP (1) | JP6595702B2 (ja) |
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CN108886231B (zh) * | 2016-03-30 | 2020-06-19 | 富士胶片株式会社 | 激光装置及光声测量装置 |
WO2018096770A1 (ja) * | 2016-11-25 | 2018-05-31 | 富士フイルム株式会社 | 光音響計測装置 |
US10855050B1 (en) * | 2017-11-21 | 2020-12-01 | Arete Associates | Methods of laser pulse development and maintenance in a compact laser resonator |
CN112650707A (zh) * | 2019-10-10 | 2021-04-13 | 上海科技大学 | 多通道光声信号延迟装置、系统、信号处理方法、终端、介质 |
KR102171300B1 (ko) * | 2020-07-31 | 2020-10-28 | 국방과학연구소 | 수중 음파 발생 장치 및 방법 |
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JP2015029048A (ja) * | 2013-07-05 | 2015-02-12 | 富士フイルム株式会社 | レーザ装置及び光音響計測装置 |
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CN105720476B (zh) * | 2016-04-18 | 2018-11-06 | 长春理工大学 | 基于激光增益突升的高峰值窄脉冲激光器 |
CN106253043B (zh) * | 2016-08-31 | 2019-08-23 | 中国科学院半导体研究所 | 一种时域包络形貌可调的猝发脉冲激光再生放大器 |
DE102016122705B3 (de) * | 2016-11-24 | 2018-03-29 | Trumpf Scientific Lasers Gmbh + Co. Kg | Verfahren zur anregung eines kristalls einer pockels-zelle und verstärkungseinheit |
CN108110604A (zh) * | 2018-01-15 | 2018-06-01 | 中国科学院福建物质结构研究所 | 电光调q脉冲激光器和方法及应用其的激光医疗设备 |
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