JP6551898B1 - レーザー装置、光源および測定装置 - Google Patents
レーザー装置、光源および測定装置 Download PDFInfo
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Abstract
Description
以下、本発明の実施の形態に係るレーザー装置について説明する。このレーザー装置によって発振されるレーザー光は、特に中赤外のレーザー光を発するOPOのポンプ光として好ましく用いられる。図1は、このレーザー装置1の構成を示す図である。ここでは、このレーザー装置1において発振のために使用されるレーザー光である励起光100、最終的に出力されるレーザー光である出力光200の光軸は共通(図1における左右方向)とされ、図1においては、この光軸に沿った断面が示されている。
図11は、本実施形態の測定装置300の構成を示す図である。測定装置300は、測定対象320に波長変換光201を照射し、測定対象320に反射した反射光301Aの吸光度を測定することにより測定対象320に含まれる物質の測定を行う。測定対象320は、例えば生体(特に、人体)であるが、測定対象320の種類は、特に限定されない。前記物質は、例えば、血液中の糖であるが、特に限定はされない。測定装置300は、血糖計であってもよいし、非侵襲で生体内の物質量を測定する他の装置(例えば、パルスオキシメータ)であってもよい。
20、50、70 光共振器
21、25 入射鏡
22 出射鏡
26、31 レーザー媒質
27、32 可飽和吸収体
30 光学素子焼結体
40、60 空間フィルター
41 第1レンズ
42 第2レンズ
43、61 絞り
431 通路
431A 開口部
432 テーパー部
80 レーザー媒質冷却部
81 保持部
82 上板
83、85 伝熱薄板
84 ペルチェ素子
86 ベースプレート
87 放熱部
100 励起光
110 半導体レーザー(励起光源)
200 出力光
300 測定装置
310 光源
311 光パラメトリック発振器(OPO)
313 非線形結晶
315 光学系
330 検出器
Claims (11)
- 励起光を吸収して光を発するレーザー媒質と可飽和吸収体とが内部に設けられた光共振器が用いられ、パルス状の前記励起光が前記光共振器内に入射することによって前記レーザー媒質が発した光を前記光共振器内で増幅したレーザー光を出力光として前記光共振器から出力するレーザー装置であって、
前記レーザー媒質にはイッテルビウム(Yb)が添加され、
前記励起光のパルス幅、前記光共振器の共振器長、及び前記可飽和吸収体は、単一パルスとなる前記励起光に対して、複数のパルスからなる前記出力光が発せられるように設定され、
前記光共振器の内部における前記光の光路、前記光共振器の外部における前記出力光の光路、のいずれかにおいて、横発振モードを単一モードに近付けるように、光軸周りの広がりを制限する空間フィルターが設けられたことを特徴とするレーザー装置。 - 前記共振器の共振器長が50mm以上である、請求項1に記載のレーザー装置。
- 前記レーザー媒質はイットリウム・アルミニウム・ガーネット(YAG)にイッテルビウム(Yb)が添加されて構成されたことを特徴とする請求項1または2に記載のレーザー装置。
- 前記出力光の発振パルス幅が4ns以上とされたことを特徴とする請求項1から請求項3までのいずれか1項に記載のレーザー装置。
- 前記空間フィルターは、光を収束させる光学系と、当該光のビームウエストにおいて光軸周りの広がりを制限する絞りと、を具備することを特徴とする請求項1から請求項4までのいずれか1項に記載のレーザー装置。
- 前記可飽和吸収体はクロム(Cr)が添加されて構成されたことを特徴とする請求項1から請求項5までのいずれか1項に記載のレーザー装置。
- 前記可飽和吸収体はイットリウム・アルミニウム・ガーネット(YAG)にクロム(Cr)が添加されて構成されたことを特徴とする請求項6に記載のレーザー装置。
- 前記レーザー媒質と前記可飽和吸収体とは一体化されたことを特徴とする請求項7に記載のレーザー装置。
- 光パラメトリック発振(Optical Parametric Oscillation)のポンプ光の光源として用いられることを特徴とする請求項1から請求項8までのいずれか1項に記載のレーザー装置。
- 請求項1から請求項9までのいずれか1項に記載のレーザー装置と、
前記レーザー装置から出射されたレーザー光を波長変換する非線形結晶を含む光パラメトリック発振器と、
前記光パラメトリック発振器によって波長変換された光を外部に出射する光学系とを備えることを特徴とする光源。 - 請求項10に記載の光源と、
前記光源から出射された光が、測定対象に反射した光または測定対象を透過した光を検出する光検出器とを備えることを特徴とする測定装置。
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JP2017170416 | 2017-09-05 | ||
JP2017170416 | 2017-09-05 | ||
PCT/JP2018/031387 WO2019049694A1 (ja) | 2017-09-05 | 2018-08-24 | レーザー装置、光源および測定装置 |
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US11840095B2 (en) * | 2021-04-06 | 2023-12-12 | Hand Held Products, Inc. | Thermoelectric cooling assembly |
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US11482831B2 (en) | 2022-10-25 |
US20200220318A1 (en) | 2020-07-09 |
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EP3680998A4 (en) | 2021-06-16 |
CN118099918A (zh) | 2024-05-28 |
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US20220416499A1 (en) | 2022-12-29 |
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