Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from solid or gel state
Reexamination Certificate
2007-12-04
2007-12-04
Hiteshew, Felisa (Department: 1722)
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth from solid or gel state
C117S002000, C117S003000
Reexamination Certificate
active
11062711
ABSTRACT:
A method is described for making an especially not-(111)-oriented low-stress large-volume crystal having a glide plane with reduced stress birefringence and more uniform refractive index. The method includes growing and tempering the crystal while heating and/or cooling to form a temperature gradient in order to relax stresses arising along the glide plane. During the tempering the heating and/or cooling occurs by heat transfer in a heat transfer direction and the heat transfer direction or temperature gradient is oriented at an angle of from 5° to 90° to the glide plane. Crystals with a uniform refractive index with variations of less than 0.025×10−6(RMS value) are produced by the method.
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Kusch Christian
Parthier Lutz
Staeblein Joerg
Wehrhan Gunther
Hiteshew Felisa
Schott AG
Striker Michael J.
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