JP2021090990A - レーザービームのスポット形状の補正方法 - Google Patents
レーザービームのスポット形状の補正方法 Download PDFInfo
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Abstract
Description
本発明の実施形態1に係るレーザービームのスポット形状の補正方法を図面に基づいて説明する。まず、実施形態1に係るレーザービームのスポット形状の補正方法を実施するレーザー加工装置1の構成を説明する。図1は、実施形態1に係るレーザービームのスポット形状の補正方法を実施するレーザー加工装置の構成例を示す斜視図である。実施形態1に係る図1に示すレーザー加工装置1は、被加工物200に対してパルス状のレーザービーム21を照射し、被加工物200をレーザー加工する装置である。
図1に示されたレーザー加工装置1の加工対象である被加工物200は、シリコン、サファイア、ガリウムヒ素などの基板201を有する円板状の半導体ウエーハや光デバイスウエーハ等のウエーハである。被加工物200は、図1に示すように、基板201の表面202に格子状に設定された分割予定ライン203と、分割予定ライン203によって区画された領域に形成されたデバイス204と、を有している。デバイス204は、例えば、IC(Integrated Circuit)、又はLSI(Large Scale Integration)等の集積回路、CCD(Charge Coupled Device)、又はCMOS(Complementary Metal Oxide Semiconductor)等のイメージセンサである。
レーザー加工装置1は、図1に示すように、被加工物200を保持面11で保持する保持手段であるチャックテーブル10と、レーザービーム照射手段であるレーザービーム照射ユニット20と、移動ユニット30と、撮像ユニット40と、制御部100とを有する。
本発明の実施形態2に係るレーザービームのスポット形状の補正方法を図面に基づいて説明する。図15は、実施形態2に係るレーザービームのスポット形状の補正方法を実施するレーザー加工装置の構成例を示す斜視図である。図16は、図15に示されたレーザー加工装置のレーザービーム照射ユニットの構成を説明する図である。なお、図15及び図16は、実施形態1と同一部分に同一符号を付して説明を省略する。
本発明の実施形態1及び実施形態2の変形例に係るレーザー加工装置を図面に基づいて説明する。図31は、実施形態1及び実施形態2の変形例に係るレーザービームのスポット形状の補正方法を実施するレーザー加工装置の構成例を示す斜視図である。なお、図31は、実施形態1と同一部分に同一符号を付して説明を省略する。
10 チャックテーブル(保持手段)
20 レーザービーム照射ユニット
21 レーザービーム
22 レーザー発振器
23 集光レンズ
24 空間光変調器
25 凹面鏡
28 ビームプロファイラ(撮像手段)
100 制御部
200 被加工物
211 集光点
212 反射光
241 表示部
251 焦点
252 反射面
400 XY平面像
500 XZ平面像
501 XZ平面像(理想の形状および強度分布を有するレーザービームのXZ平面像)
600 YZ平面像
601 YZ平面像(理想の形状および強度分布を有するレーザービームのYZ平面像)
ST1 記憶ステップ
ST2 凹面鏡配置ステップ
ST3 焦点位置付けステップ
ST4 レーザービーム照射ステップ
ST5 撮像ステップ
ST6 画像形成ステップ
ST7 比較ステップ
ST9 判断ステップ
Claims (4)
- 被加工物を保持する保持手段と、
該保持手段に保持された被加工物にレーザービームを照射するレーザービーム照射手段と、
制御部と、を備え、
該レーザービーム照射手段は、
レーザー発振器と、
該レーザー発振器から発振されたレーザービームを集光する集光レンズと、
該レーザー発振器と該集光レンズとの間に配設された空間光変調器と、
を有するレーザー加工装置において、
該集光レンズによって集光されたレーザービームのスポット形状を補正するレーザービームのスポット形状補正方法であって、
反射面が球面となっている凹面鏡を該レーザービーム照射手段の該集光レンズと対面する位置に位置付ける凹面鏡配置ステップと、
該凹面鏡配置ステップの後、該集光レンズの集光点を該凹面鏡の焦点位置に位置付ける焦点位置付けステップと、
該レーザー発振器を作動し該集光レンズによって集光されたレーザービームを該凹面鏡に照射するレーザービーム照射ステップと、
該凹面鏡の反射面で反射した反射光を撮像手段によって撮像する撮像ステップと、
該撮像ステップで撮像されたレーザービームの形状および強度分布を示すXY平面像から、XZ平面像またはYZ平面像を形成する画像形成ステップと、
該画像形成ステップで形成された画像と、理想の形状および強度分布を有するレーザービームのXZ平面像またはYZ平面像と、を比較する比較ステップと、を有し、
該画像形成ステップで形成されたXZ平面像またはYZ平面像と、該理想の形状および強度分布を有するレーザービームのXZ平面像またはYZ平面像とが一致するように、該空間光変調器の表示部に表示させる位相パターンを変更することを特徴とする、レーザービームのスポット形状の補正方法。 - 該撮像ステップで撮像されたレーザービームの画像がどの収差成分を含んでいるかを判断する判断ステップを更に有し、
該判断ステップで判断された収差成分を打ち消すような位相パターンを該空間光変調器の表示部に表示させることを特徴とする、
請求項1に記載のレーザービームのスポット形状の補正方法。 - 該撮像ステップで撮像されたレーザービームがどの収差成分を含んでいるかを判断する判断ステップと、
該理想の形状および強度分布を有するレーザービームがどの収差成分を含んでいるかを記憶しておく記憶ステップと、
を更に含み、
該撮像ステップで撮像されたレーザービームの収差成分が該理想のレーザービームの収差成分と一致するように、該空間光変調器の表示部に表示させる位相パターンを変更することを特徴とする、請求項1に記載のレーザービームのスポット形状の補正方法。 - 該比較ステップでは、
比較した画像の相違が所定の割合以下であれば合格とし、
所定の割合より大きければ再度スポット形状の補正を行うことを特徴とする、請求項1乃至請求項3のうちいずれか一項に記載のレーザービームのスポット形状の補正方法。
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