19 February 2003 Micro machining of ITO film by LD-pumped SGH YAG laser
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Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.486573
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan
ITO film, which is a kind of transparent conductive film, has been used for LCD, PDP and so on. This film is mostly removed by wet etching method. However, this method needs many chemicals, numbers of process and large-size equipments. On the other hand, laser beam processing can achieve the dry process without chemicals and drastically reduces the number of process. Therefore, selective removal of ITO film on glass substrate by LD pumped Q-switch SHG YAG laser is experimentally investigated. Electric insulation across machined groove was successful. Better groove shape can be obtained by accurate control of defocused distance and feed rate under a constant average power. Using SHG YAG laser makes it possible to remove only ITO film without any damage to glass material as substrate, since SHG YAG laser of 531 nm in wavelength is easy to transmit the glass material. When laser beam is irradiated from ITO film to glass material, a non-removed portion of ITO film remains at the bottom of groove under long defocused distance condition. On the other hand, backside irradiation method, in which laser beam is irradiated to ITO film through glass material, can prevent from remaining a non-removed portion, since absorption of laser beam occurs from the boundary part between ITO film and glass material.
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Yasuhiro Okamoto, Yasuhiro Okamoto, Yoshiyuki Uno, Yoshiyuki Uno, Yasuyuki Hirao, Yasuyuki Hirao, "Micro machining of ITO film by LD-pumped SGH YAG laser", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); doi: 10.1117/12.486573; https://doi.org/10.1117/12.486573

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