Method for producing an optical component of synthetic...

Details Method for producing an optical component of synthetic... Method for producing an optical component of synthetic...

2011-07-19

2011-07-19

Daniels, Matthew J (Department: 1741)

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

C065S117000

Reexamination Certificate

active

07980098

ABSTRACT:
To optimize an optical component of synthetic quartz glass, in the case of which a quartz glass blank is subjected to a multistage annealing treatment, with respect to compaction and central birefringence, the present invention suggests a method comprising the following steps:(a) a first treatment phase during which the quartz glass blank is treated in an upper temperature range between 1130° C. and 1240° C.,(b) cooling the quartz glass blank at a first-higher-mean cooling rate to a quenching temperature below 1100° C., a fictive temperature with a high mean value of 1100° C. or more being reached in the quartz glass,(c) a second treatment phase which comprises cooling of the quartz glass blank at a second-lower-mean cooling rate, and in which the quartz glass blank is treated in a lower temperature range between 950° C. and 1100° C. such that a fictive temperature is reached in the quartz glass with a low mean value which is at least 50° C. lower than the high mean value of the fictive temperature according to method step (b).

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EPODOC English language abstract for JP2002121038, Apr. 23, 2002.

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