Electric heating – Metal heating – By arc
Patent
1997-10-03
1999-12-28
Mills, Gregory
Electric heating
Metal heating
By arc
21912171, 21912185, 264 127, 264 137, 264400, B23K 2600
Patent
active
060084677
ABSTRACT:
In a method for forming a hole for fitting an optical fiber only at a core portion without having to precisely match or accord the focus of a laser beam with the end surface of an optical waveguide, when a laser beam is irradiated onto the end surface of the optical waveguide, the focus of the laser beam is turned away from the end surface of the optical waveguide and a region of the irradiation includes the core and the periphery thereof. Thereafter, the energy of the laser beam is increased step by step, and a few pulses thereof are radiated with the intensity fixed when ablation occurs at the core portion, so that the hole is formed only at the core portion.
REFERENCES:
patent: 4147402 (1979-04-01), Chown
patent: 4598039 (1986-07-01), Fischer et al.
patent: 5393371 (1995-02-01), Chang et al.
Koyama Tadashi
Tsunetomo Keiji
Mills Gregory
Nippon Sheet Glass Co. Ltd.
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