JP7481846B2 - ビーム特性の修正のためのシステムおよび方法 - Google Patents
ビーム特性の修正のためのシステムおよび方法 Download PDFInfo
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- JP7481846B2 JP7481846B2 JP2019565390A JP2019565390A JP7481846B2 JP 7481846 B2 JP7481846 B2 JP 7481846B2 JP 2019565390 A JP2019565390 A JP 2019565390A JP 2019565390 A JP2019565390 A JP 2019565390A JP 7481846 B2 JP7481846 B2 JP 7481846B2
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- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- General Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Plasma & Fusion (AREA)
- Nonlinear Science (AREA)
- Automation & Control Theory (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Crystallography & Structural Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Lasers (AREA)
- Optical Couplings Of Light Guides (AREA)
- Laser Beam Processing (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
[0001] 本願は、2016年9月29日に出願された米国仮特許出願第62/401,650の優先権を主張して2017年5月26日に出願された国際出願PCT/US2017/034848号の一部継続出願である。本願は、2016年9月29日に出願された米国仮特許出願第62/401,650号の優先権を主張して2017年5月26日に出願された米国特許出願第15/607,411号の一部継続出願である。本願は、2016年9月29日に出願された米国仮特許出願第62/401,650号の優先権を主張して2017年5月26日に出願された米国特許出願第15/607,410号の一部継続出願である。本願は、2016年9月29日に出願された米国仮特許出願第62/401,650号の優先権を主張して2017年5月26日に出願された米国特許出願第15/607,399号の一部継続出願である。以上の出願をここで引用したことにより、これら全ての開示内容全体が本願にも含まれるものとする。
[0002] 本明細書において開示する技術は、ファイバ・レーザ、およびファイバ結合レーザに関する。更に特定すれば、開示する技術は、光ビーム特性(スポット・サイズ、発散プロファイル、空間プロファイル、またはビーム形状等、あるいはこれらの任意の組み合わせ)を調節し、ファイバ・レーザまたはファイバ結合レーザの出力において、調節した光ビーム特性を維持するための方法、機器、およびシステムに関する。
[0033] 本明細書において使用する場合の単語および用語の定義
[0034] 本明細書において開示するのは、先に説明した従来の方法のコスト、複雑さ、光損失、またはその他の欠点を減らすことができ、可変ビーム特性(VBC)を有するレーザ・ビームを供給するように動作可能なファイバを提供するように構成された方法、システム、および機器である。このVBCファイバは、広範囲におよぶ多様な光ビーム特性を変化させるように構成される。このようなビーム特性は、VBCファイバを使用して制御することができ、つまり、ユーザが広く多様なレーザ処理用途の個々の要件に適するように、種々のビーム特性を調整する(tune)ことを可能にする。例えば、ビーム径、ビーム発散分布、BPP、強度分布、M2係数、NA、光強度、パワー密度、半径方向ビーム位置、放射輝度、スポット・サイズ等、またはこれらの任意の組み合わせを調整するために、VBCファイバを使用することができる。
[00106] 図29Aは、可変ビーム特性を付与する(provide)ように構成されたVBCファイバ・アセンブリ2902と、プロセス・ヘッド例2904とを含むレーザ・システム例2900を示す。VBCファイバ・アセンブリ2902は、先に論じたように、第1長のファイバ104、第2長のファイバ108、および摂動デバイス110を含むことができる。VBCファイバ・アセンブリ2902は、レーザ源(図示せず)からの出力ファイバであってもよい、入射側ファイバ(feeding fiber)2906とVBC伝送ファイバ2908との間に配置され、2906と動作可能に結合することができる。VBC伝送ファイバ2908は、第2長のファイバ108の少なくとも一部を含むことができる。また、VBC伝送ファイバ2908は、第2長のファイバ108を延長しても、または第2長のファイバ108の延長部であってもよい。VBC伝送ファイバ2908は、これを通過するビームの調節特性を修正する、維持する、および/または制限するように構成することができる。また、VBC伝送ファイバ2908は、調節されたビーム2910のような、ビームを、VBC伝送ファイバ2908と結合された自由空間光学素子アセンブリ(free-space optics assembly)2912に伝送するように構成することもできる。プロセス・ファイバ2914は、自由空間光学素子アセンブリ2912と動作可能に結合され、これからビームを受けるように構成することができる。プロセス・ヘッド2904は、プロセス・ファイバ2914と動作可能に結合され、これからビーム(例えば、調節されたビーム2910)を受け、このビーム1を1つ以上の下流プロセス2916に伝送するように構成することができる。図29Aに示すように、プロセス・ヘッド2904と下流プロセス2916との間に、1つ以上のレンズ(1つを2918で示す)を随意に配置してもよい。
Claims (20)
- システムであって、
光ビームを生成するように構成された光ビーム源と、
前記光ビーム源と動作可能に結合され、前記光ビーム源から前記光ビームを受けるように構成された第1長のファイバであって、前記第1長のファイバは第1の屈折率分布(RIP)を有する、第1長のファイバと、
前記第1長のファイバと動作可能に結合され、前記第1長のファイバを通過する前記光ビームを修正するように構成された摂動デバイスであって、曲げ加工アセンブリ、マンドレル、フレキシブル・チュービング、前記第1長のファイバにおけるマイクロベンディング、ローラ、締結具、音響光学変換器、熱デバイス、ファイバ・ストレッチャ、圧電デバイス、グレーティング、またはこれらの組み合わせである、摂動デバイスと、
前記第1長のファイバと動作可能に結合され、前記修正された光ビームを前記第1長のファイバから受けるように構成された第2長のファイバ(ただし、前記第2長のファイバが前記第1長のファイバとビーム結合器によって結合される場合を除く)であって、前記第2長のファイバは、前記第1のRIPとは異なる第2のRIPを規定する複数の閉じ込め領域を含むマルチコア・ファイバであって、前記第2長のファイバは、前記修正された光ビームを前記複数の閉じ込め領域の少なくとも1つに閉じ込めるように構成されている、第2長のファイバと、
前記第2長のファイバと動作可能に結合されたビーム整形アセンブリであって、前記第2長のファイバから前記修正された光ビームを受け、前記修正された光ビームの1つ以上のビーム特性を調節し、前記調節した光ビームを下流プロセスに導くように構成される、 ビーム整形アセンブリと、
を備える、システム。 - 請求項1記載のシステムにおいて、前記ビーム整形アセンブリが、
前記修正された光ビームを前記第2長のファイバから受けるように構成された第1レンズと、
前記第1レンズの下流側に配置され前記第1レンズと動作可能に結合された第2レンズと、
前記第2レンズの下流側に配置され前記第2レンズと動作可能に結合された回折光学素子と、
を備える、システム。 - 請求項2記載のシステムであって、更に、前記ビーム整形アセンブリと前記下流プロセスとの間に挟まれたビーム整形コンポーネントを備え、前記ビーム整形コンポーネントが、前記調節された光ビームを前記ビーム整形アセンブリから受け、前記調節された光ビームを前記下流プロセスに導くように構成される、システム。
- 請求項3記載のシステムにおいて、前記マルチコア・ファイバが、第1閉じ込め領域と第2閉じ込め領域とを含み、前記第1および第2閉じ込め領域が、前記第2長のファイバの直径に沿って互いに整列される、システム。
- 請求項4記載のシステムにおいて、前記第1および第2閉じ込め領域が円形である、システム。
- 請求項5記載のシステムにおいて、前記第2長のファイバが第3閉じ込め領域を含み、前記第3閉じ込め領域が矩形である、システム。
- 請求項3記載のシステムにおいて、前記複数の閉じ込め領域の各々が、異なるNA分布、ならびに同じ形状および寸法を含む、システム。
- 請求項3記載のシステムにおいて、前記複数の閉じ込め領域の各々が、同じNA分布および異なる形状、寸法、または双方を含む、システム。
- 請求項3記載のシステムにおいて、前記複数の閉じ込め領域の各々が、異なる寸法、異なるサイズ、異なる形状、異なるNA分布、またはこれらの組み合わせの内1つ以上を含む、システム。
- 請求項1記載のシステムにおいて、前記第2長のファイバが、前記ビーム整形アセンブリと動作可能に結合されたレンズ状エンド・キャップを備え、前記ビーム整形アセンブリが、前記レンズ状エンド・キャップと動作可能に結合されたレンズと、前記レンズの下流側に配置され前記レンズと動作可能に結合された回折光学素子とを備える、システム。
- 請求項10記載のシステムにおいて、前記マルチコア・ファイバが、第1閉じ込め領域と第2閉じ込め領域とを含む、システム。
- 請求項11記載のシステムにおいて、前記第1閉じ込め領域および前記第2閉じ込め領域が円形で互いに同心円状であり、前記第1閉じ込め領域が、前記第2閉じ込め領域よりも相対的に小さい直径を有する、システム。
- 請求項1記載のシステムにおいて、前記ビーム整形アセンブリが、
前記修正された光ビームを前記第2長のファイバから受けるように構成された第1レンズと、
前記第1レンズの下流側に配置され、前記第1レンズと動作可能に結合された第2レンズであって、前記修正された光ビームを前記下流プロセスに導くように構成される、第2レンズと、
を備える、システム。 - 請求項13記載のシステムにおいて、前記マルチコア・ファイバが、第1閉じ込め領域と第2閉じ込め領域とを含む、システム。
- 請求項14記載のシステムにおいて、前記第1閉じ込め領域および前記第2閉じ込め領域が、円形で互いに同心円状であり、前記第1閉じ込め領域が、前記第2閉じ込め領域よりも相対的に小さい直径を有する、システム。
- 請求項1記載のシステムにおいて、前記ビーム整形アセンブリが、
前記修正された光ビームを前記第2長のファイバから受けるように構成された第1レンズと、
前記第1レンズの下流側に配置され前記第1レンズと動作可能に結合された第2レンズと、
前記第2レンズの下流側に配置され前記第2レンズから前記光ビームを受けるように構成された反射器と、
を備える、システム。 - 請求項16記載のシステムにおいて、前記反射器が、更に、前記光ビームの第1部分および前記光ビームの第2部分を、それぞれ、第1光路および第2光路を通じて、前記下流プロセスに導くように構成される、システム。
- 請求項17記載のシステムにおいて、前記マルチコア・ファイバが、第1閉じ込め領域と第2閉じ込め領域とを含み、前記第1および第2閉じ込め領域が、前記第2長のファイバの直径に沿って互いに整列される、システム。
- 方法であって、
光ビーム源から光ビームを生成するステップと、
前記光ビーム源と動作可能に結合された第1長のファイバにおいて、前記光ビームを受けるステップであって、前記第1長のファイバは第1の屈折率分布(RIP)を有する、ステップと、
前記第1長のファイバを通過する前記光ビームを、前記第1長のファイバと動作可能に結合された摂動デバイスであって、曲げ加工アセンブリ、マンドレル、フレキシブル・チュービング、前記第1長のファイバにおけるマイクロベンディング、ローラ、締結具、音響光学変換器、熱デバイス、ファイバ・ストレッチャ、圧電デバイス、グレーティング、またはこれらの組み合わせである、摂動デバイスによって修正し、修正された光ビームを生成するステップと、
前記第1長のファイバと動作可能に結合された第2長のファイバ(ただし、前記第2長のファイバが前記第1長のファイバとビーム結合器によって結合される場合を除く)において、前記修正された光ビームを受けるステップであって、前記第2長のファイバは、第1のRIPとは異なる第2のRIPを規定する複数の閉じ込め領域を含むマルチコア・ファイバであって、前記第2長のファイバは、前記修正された光ビームを前記複数の閉じ込め領域の少なくとも1つに閉じ込めるように構成されている、ステップと、
前記第2長のファイバからの前記修正された光ビームを、前記第2長のファイバと動作可能に結合されたビーム整形アセンブリにおいて受けるステップと、
前記修正された光ビームの1つ以上のビーム特性を、前記ビーム整形アセンブリによって調節するステップと、
前記調節した光ビームを下流プロセスに導くステップと、
を含む、方法。 - 請求項19記載の方法において、前記ビーム整形アセンブリが、1つ以上のビーム整形デバイスを備える、方法。
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