JP6073020B2 - 高品質で安定した出力ビーム、および長寿命高変換効率の非線形結晶を備えたレーザ - Google Patents
高品質で安定した出力ビーム、および長寿命高変換効率の非線形結晶を備えたレーザ Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims description 171
- 238000006243 chemical reaction Methods 0.000 title claims description 50
- 238000000034 method Methods 0.000 claims description 43
- 230000003287 optical effect Effects 0.000 claims description 32
- 238000007493 shaping process Methods 0.000 claims description 23
- 238000000926 separation method Methods 0.000 claims description 20
- 238000005452 bending Methods 0.000 claims description 6
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 5
- NNAZVIPNYDXXPF-UHFFFAOYSA-N [Li+].[Cs+].OB([O-])[O-] Chemical compound [Li+].[Cs+].OB([O-])[O-] NNAZVIPNYDXXPF-UHFFFAOYSA-N 0.000 claims description 4
- VCZFPTGOQQOZGI-UHFFFAOYSA-N lithium bis(oxoboranyloxy)borinate Chemical compound [Li+].[O-]B(OB=O)OB=O VCZFPTGOQQOZGI-UHFFFAOYSA-N 0.000 claims description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- JDLDTRXYGQMDRV-UHFFFAOYSA-N tricesium;borate Chemical compound [Cs+].[Cs+].[Cs+].[O-]B([O-])[O-] JDLDTRXYGQMDRV-UHFFFAOYSA-N 0.000 claims description 3
- XBJJRSFLZVLCSE-UHFFFAOYSA-N barium(2+);diborate Chemical compound [Ba+2].[Ba+2].[Ba+2].[O-]B([O-])[O-].[O-]B([O-])[O-] XBJJRSFLZVLCSE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 2
- 238000007689 inspection Methods 0.000 description 25
- 230000010287 polarization Effects 0.000 description 25
- 230000008569 process Effects 0.000 description 23
- 238000005286 illumination Methods 0.000 description 22
- 230000007547 defect Effects 0.000 description 20
- 238000000137 annealing Methods 0.000 description 17
- 239000012535 impurity Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 12
- 201000009310 astigmatism Diseases 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 235000012431 wafers Nutrition 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000003230 hygroscopic agent Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
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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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- H01S5/00—Semiconductor lasers
- H01S5/005—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
- H01S5/0092—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 nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
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Description
本願は、「Mode−Locked UV Laser With High Quality,Stable Output Beam, Long−Life High Conversion Efficiency Non−Linear Crystal And A Wafer Inspection Using A Mode−Locked UVLaser」と題し、2011年7月22日に出願された米国仮出願第61/510,633号の優先権を主張する。
の因数で縮小されることになる。さらに、ビーム成形光学部品106を実装するための光学部品も出力ビームのより短い波長の主原因となるはずである。特に、より高いレーザ出力および/またはより短いレーザ波長が、より高速でのより小さな欠陥の検出を可能にする。M2=1.0に近い高品質ビームを小さなスポットまたは狭い線にぴったりと集束し、それによって小さい欠陥の検出を容易にすることができる。1.0のM2値が理想的なガウス断面のあるレーザビームに相当することに留意されたい。好ましい一実施形態では、ビーム成形光学部品106は約1.2未満であるM2値の出力ビームを生じさせることができる。
Claims (12)
- 低温で動作可能なモードロックレーザシステムであって、
光源と、
アニールされた周波数変換結晶と、
前記低温での標準動作中に前記結晶のアニール状態を維持するためのハウジングと、
前記光源からビームを受光し、前記結晶内にまたは前記結晶に近接して位置するビームウエストでの楕円断面に前記ビームを集束するように構成された第1のビーム成形光学部品と、
前記結晶からの出力を、空間で分離された異なる周波数のビームに分割するための高調波分離ブロックと、
を備え、
前記結晶が、非ウォークオフ方向でのレイリー領域の2倍、およびラジアン単位のウォークオフ角で除算されたウォークオフ方向でのビームウエスト半径の2倍の長さの小さい方にほぼ等しい長さを有する、
モードロックレーザシステム。 - 前記結晶が、約266nmの高調波を生じさせ、前記長さが少なくとも12.5mmであるセシウムホウ酸リチウム(CLBO)結晶である、請求項1に記載のモードロックレーザシステム。
- 所望される周波数ビームの楕円断面を所望されるアスペクト比に変換するように構成された第2のビーム成形光学部品をさらに含む、請求項1に記載のモードロックレーザシステム。
- 前記結晶の前記楕円断面が2:1と6:1との間のアスペクト比を有する、請求項1に記載のモードロックレーザシステム。
- 前記第1のビーム成形光学部品が、プリズム、円筒形湾曲素子、放射状‐対称湾曲素子、および屈折素子の内の少なくとも1つを含む、請求項1に記載のモードロックレーザシステム。
- 前記高調波分離ブロックがプリズムを含む、請求項1に記載のモードロックレーザシステム。
- 前記プリズムがペラン‐ブロカプリズムである、請求項6に記載のモードロックレーザシステム。
- 前記結晶が、CLBO(セシウムホウ酸リチウム)結晶、CBO(ホウ酸セシウム)結晶、BBO(βホウ酸バリウム)結晶、LBO(三ホウ酸リチウム)結晶、ニオブ酸リチウム結晶、KDP(リン酸二水素カリウム)結晶、または別の非線形光学結晶の内の1つである、請求項1に記載のモードロックレーザシステム。
- 前記光源の光周波数高調波を生成するための第2のアニールされた周波数変換結晶をさらに含む、請求項1に記載のモードロックレーザシステム。
- 低温でレーザシステムを操作する方法であって、
光源から、アニールされた周波数変換結晶内にまたはアニールされた周波数変換結晶に近接して位置するビームウエストでの楕円断面の中にビームを集束すること、
前記結晶の出力から、任意の望ましくない周波数ビームから所望される周波数ビームを分離すること、
を含み、
前記結晶が、非ウォークオフ方向でのレイリー領域の2倍、およびラジアン単位のウォークオフ角で除算されたウォークオフ方向でのビームウエスト半径の2倍の長さの小さい方にほぼ等しい長さを有する、
方法。 - 前記低温での標準動作中に前記結晶のアニール状態を維持することをさらに含む、請求項10に記載の方法。
- 前記楕円断面を円形断面に変換することをさらに含む、請求項10に記載の方法。
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