JP2020127051A - レーザ装置、点火装置及び内燃機関 - Google Patents
レーザ装置、点火装置及び内燃機関 Download PDFInfo
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Abstract
Description
以下、本発明の一実施形態を図面を用いて説明する。図1には、一実施形態に係る内燃機関としてのエンジン300の主要部が模式図的に示されている。
(1)燃料噴出機構302が、燃料と空気の可燃性混合気を燃焼室304内に噴出させる(吸気)。
(2)ピストン305が上昇し、可燃性混合気を圧縮する(圧縮)。
(3)点火装置301が、燃焼室304内にレーザ光を射出する。これにより、燃料に点火される(着火)。
(4)燃焼ガスが発生し、ピストン305が降下する(燃焼)。
(5)排気機構303が、燃焼ガスを燃焼室304外へ排気する(排気)。
レーザ装置200から射出される光のZ軸方向に関する集光位置の調整は、射出光学系210の焦点距離、及びZ軸方向に関する射出光学系210の配置位置を調整することにより、行うことができる。
ここでは、Nd:YAG結晶及びCr:YAG結晶は、いずれもセラミックスであるため、単結晶に比べて生産性が良い。
発振効率=(「レーザ共振器から出力される1パルスあたりのエネルギー」×「発振パルス数」)÷(「光ファイバから射出される光のパワー」×「面発光レーザアレイの点灯時間」)×100 ……(1)
ここでは、光ファイバから射出される光(励起光)のパワーは200Wとした。また、面発光レーザアレイの点灯時間は500μ秒とした。
r=2.62×T0+0.675 ……(2)
また、同様にフィッティングを行うと、上記励起光のビームウエスト径の下限値は次の(3)式で示すことができる。
r=7.75×T04−7.77×T03+3.13×T02+0.16×T0+0.74 ……(3)
《レーザアニール装置》
一例として図17A及び図17Bに、レーザ装置200を有するレーザアニール装置1000の概略構成が示されている。このレーザアニール装置1000は、光源1010、光学系1020、テーブル装置1030、及び不図示の制御装置などを備えている。
《レーザ加工機》
一例として図18に、レーザ装置200を有するレーザ加工機3000の概略構成が示されている。このレーザ加工機3000は、光源3010、光学系3100、対象物Pが載置されるテーブル3150、テーブル駆動装置3160、操作パネル3180及び制御
装置3200などを備えている。
Claims (14)
- 半導体レーザを含む光源装置と、
前記光源装置からの光が照射され、可飽和吸収体を含むレーザ共振器とを備え、
前記レーザ共振器に照射される光のビームウエスト直径rが、前記可飽和吸収体の初期透過率T0に対して、7.75×T04−7.77×T03+3.13×T02+0.16×T0+0.74≦r≦2.62×T0+0.675、
の関係を満足するレーザ装置。 - 前記半導体レーザは、面発光レーザアレイであることを特徴とする請求項1に記載のレーザ装置。
- 前記可飽和吸収体の初期透過率T0は、0.15〜0.70であることを特徴とする請求項1又は2に記載のレーザ装置。
- 前記光源装置は、前記半導体レーザから射出されるレーザ光を伝送する光伝送部材を含むことを特徴とする請求項1〜3のいずれか一項に記載のレーザ装置。
- 前記光伝送部材は、光ファイバであることを特徴とする請求項4に記載のレーザ装置。
- 前記レーザ共振器に照射される光のビームウエウスト径は、前記光ファイバのコア直径以上の大きさであることを特徴とする請求項5に記載のレーザ装置。
- 前記光伝送部材と前記レーザ共振器との間の光路上に配置された少なくとも1つの光学素子を備えることを特徴とする請求項4〜6のいずれか一項に記載のレーザ装置。
- 前記レーザ共振器は、Qスイッチレーザであることを特徴とする請求項1〜7のいずれか一項に記載のレーザ装置。
- 前記レーザ共振器は、レーザ媒質を含むことを特徴とする請求項8に記載のレーザ装置。
- 前記レーザ媒質はNdがドープされたYAG結晶であり、前記可飽和吸収体はCrがドープされたYAG結晶であることを特徴とする請求項9に記載のレーザ装置。
- 前記レーザ共振器は、コンポジット結晶であることを特徴とする請求項9又は10に記載のレーザ装置。
- 前記レーザ共振器は、セラミックスであることを特徴とする請求項1〜11のいずれか一項に記載のレーザ装置。
- 請求項1〜12のいずれか一項に記載のレーザ装置と、
前記レーザ装置からの光を集光する光学系とを備える点火装置。 - 燃料を燃焼させて燃焼ガスを生成する内燃機関において、
前記燃料に点火するための請求項13に記載の点火装置を備える内燃機関。
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IL251520A0 (en) * | 2017-04-02 | 2017-06-29 | Jerusalem College Of Tech | Tolerable inversion of quality factor in a pumped-diode laser |
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US10626842B2 (en) | 2020-04-21 |
JPWO2017094778A1 (ja) | 2018-09-13 |
FI3386041T3 (fi) | 2023-06-02 |
EP3386041A1 (en) | 2018-10-10 |
EP3386041B1 (en) | 2023-04-05 |
EP3386041A4 (en) | 2019-01-02 |
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WO2017094778A1 (ja) | 2017-06-08 |
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