TY - GEN
T1 - Influence of polarization plane on groove shape in scribing of sapphire by THG:YAG laser
AU - Okamoto, Yasuhiro
AU - Sakagawa, Tomokazu
AU - Uno, Yoshiyuki
AU - Mukoya, Yutaka
AU - Okamura, Yuki
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Scribing characteristics of mono-crystalline sapphire by using THG:YAG laser of 355 nm in wavelength were experimentally investigated. The influence of polarization plane of laser beam on the curved shape at the tip of groove was also discussed. Moreover, the reflection of laser beam was experimentally investigated in order to clarify the generation mechanism of curved shape. The absorptivity of laser beam at high pulse repetition rate was still kept at higher order, although the feed rate became high. Therefore, the high pulse repetition rate condition is very effective for the laser scribing of sapphire. The curved shape at the tip of groove was greatly influenced by the direction of polarization plane of laser beam. This phenomenon occurred not randomly but regularly depending on the angle of polarization plane. The laser beam was reflected strongly in the direction of curved shape generation, in other words, in the vertical direction to the polarization plane of laser beam,. Therefore, the reflection of laser beam from the processing point has a close relation to the curved shape at the tip of the groove. As a result, a suitable setting of polarization plane could make the straight groove without the occurrence of curved shape.
AB - Scribing characteristics of mono-crystalline sapphire by using THG:YAG laser of 355 nm in wavelength were experimentally investigated. The influence of polarization plane of laser beam on the curved shape at the tip of groove was also discussed. Moreover, the reflection of laser beam was experimentally investigated in order to clarify the generation mechanism of curved shape. The absorptivity of laser beam at high pulse repetition rate was still kept at higher order, although the feed rate became high. Therefore, the high pulse repetition rate condition is very effective for the laser scribing of sapphire. The curved shape at the tip of groove was greatly influenced by the direction of polarization plane of laser beam. This phenomenon occurred not randomly but regularly depending on the angle of polarization plane. The laser beam was reflected strongly in the direction of curved shape generation, in other words, in the vertical direction to the polarization plane of laser beam,. Therefore, the reflection of laser beam from the processing point has a close relation to the curved shape at the tip of the groove. As a result, a suitable setting of polarization plane could make the straight groove without the occurrence of curved shape.
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M3 - Conference contribution
AN - SCOPUS:77953876723
SN - 9780912035598
T3 - ICALEO 2009 - 28th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings
SP - 1080
EP - 1085
BT - ICALEO 2009 - 28th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings
T2 - 28th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2009
Y2 - 2 November 2009 through 5 November 2009
ER -