Electric heating – Metal heating – By arc
Patent
1990-11-19
1992-03-31
Albritton, C. L.
Electric heating
Metal heating
By arc
21912169, 385 15, 385123, B23K 2600
Patent
active
051010909
ABSTRACT:
A cladding portion (15) of an optical fiber (16) is laser machined by focusing a laser beam (13) that is of an appropriate wavelength to ablate the cladding. When the laser beam completely penetrates through the cladding (15) to impinge on the optical fiber core (18) light is transmitted to the two ends of the fiber. A photodetector (31) is placed in close proximity to one of the ends of the optical fiber (16) with the photodetector output being connected to a laser control device (23). When the light detected by the detector exceeds a threshold, it generates a signal that stops the laser. Even if the cladding is of an unpredicted thickness, the laser beam is not terminated until there has been complete penetration through the cladding, and after complete ablation the laser beam is promptly terminated so as to avoid subsequent damage to the optical fiber.
REFERENCES:
patent: 4676594 (1987-06-01), Presby
patent: 4989936 (1991-02-01), Coyle, Jr. et al.
patent: 5013119 (1991-05-01), Coyle, Jr. et al.
"Excimer Lasers: An Emerging Technology in Material Processing," by T. A. Znotins et al., Laser Focus/Electro-Optics, May 1987, pp. 54-70.
Coyle, Jr. Richard J.
Grimes Gary J.
Serafino Anthony J.
Albritton C. L.
Anderson Roderick B.
AT&T Bell Laboratories
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