Patent ID: 8803027
Filing Date: 2014-08-12
Classification: B23K,C30B

Abstract:
1. A thin beam laser crystallization apparatus for selectively melting a film deposited on a substrate, the apparatus comprising: a laser source configured to produce a pulsed laser output beam, the laser source comprising: an amplifier configured to form a second discharge chamber; measurement equipment configured to measure one or more parameters of the pulsed laser output beam; and a control system configured to control the thin beam laser crystallization apparatus, wherein a ratio of the curvature of the convex reflector to the spaced apart distance from the convex reflector to the plano output coupler is in the range of 0.5 to 5, wherein the optical arrangement is configured to focus the beam in the first axis and spatially expand the beam in the second axis to produce a line beam for interaction with the film, wherein the measurement equipment is configured to measure a relationship for a first gas discharge chamber between divergence and laser pulse repetition rate over a range of pulse repetition rates, and a relationship for a second gas discharge chamber between divergence and laser pulse repetition rate over the range of pulse repetition rates, and wherein the control unit is configured to compare the measured relationship between divergence and laser pulse repetition rate for the first gas discharge chamber with the measured relationship between divergence and laser pulse repetition rate for the second gas discharge chamber, and adjust at least one of the gas temperature control setpoint and the pulse repetition rate of at least one of the first gas discharge chamber and the second gas discharge chamber to produce the pulsed laser output beam.