LASER PROCESSING DEVICE AND LASER PROCESSING METHOD

To provide a laser processing device and a laser processing method which can easily and accurately check whether or not a center position of an image of a laser beam transferred to an entrance pupil surface of a light-focusing part coincides with a center position of an entrance pupil surface of the...

Full description

Saved in:
Bibliographic Details
Main Authors OGIWARA TAKAFUMI, KOREMATSU KATSUHIRO
Format Patent
LanguageEnglish
Japanese
Published 07.09.2023
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:To provide a laser processing device and a laser processing method which can easily and accurately check whether or not a center position of an image of a laser beam transferred to an entrance pupil surface of a light-focusing part coincides with a center position of an entrance pupil surface of the light-focusing part in a prescribed direction.SOLUTION: A 4f lens unit 420 transfers an image of a laser beam L in a spatial light modulator 410 to an entrance pupil surface 430a of a condensing lens unit 430. An observation camera 488 detects reflection light RL of the laser beam L incident on an object 1 from a first surface 1a side and reflected on a second surface 1b. A control unit 500 controls the spatial light modulator 410 such that a spherical aberration is corrected and a coma aberration is generated in a Y direction on the entrance pupil surface 430a when the reflection light RL is detected by the observation camera 488 in order to check whether or not a center position of the image of the laser beam L transferred to the entrance pupil surface 430a coincides with a center position of the entrance pupil surface 430a in the X direction.SELECTED DRAWING: Figure 10 【課題】集光部の入射瞳面に転像されたレーザ光の像の中心位置が所定方向において集光部の入射瞳面の中心位置に一致しているか否かを容易に且つ精度良く確認することができるレーザ加工装置及びレーザ加工方法を提供する。【解決手段】4fレンズユニット420は、空間光変調器410におけるレーザ光Lの像を集光レンズユニット430の入射瞳面430aに転像する。観察用カメラ488は、第1面1a側から対象物1に入射して第2面1bで反射されたレーザ光Lの反射光RLを検出する。制御部500は、入射瞳面430aに転像されたレーザ光Lの像の中心位置がX方向において入射瞳面430aの中心位置に一致しているか否かを確認するために、観察用カメラ488によって反射光RLが検出される際に、球面収差が補正されるように且つ入射瞳面430aにおいてY方向にコマ収差が発生するように、空間光変調器410を制御する。【選択図】図10
Bibliography:Application Number: JP20220029450