Patent ID: 6075592
Filing Date: 2000-06-13
Classification: G01J,G01N,G01R

Abstract:
Apparatus for characterizing the photoluminescence properties of a semiconductor sample, said apparatus comprisinga translation stage on which the sample is mounted,an optical spectrum analyzer,a laser source of photoluminescence excitation for generating a light beam,a dichroic coupler having three ports,a first optical fiber connecting said laser source to a first of said ports,a second optical fiber connecting said optical spectrum analyzer to a second of said ports,a collimator for producing a collimated beam,a third optical fiber connecting said collimater to a third of said ports, andan objective lens positioned in an air gap between said collimator and said sample for focusing the collimated beam onto said sample to generate a reflected beam representative of the photoluminescent energy emitted by said sample, said collimated beam having a diameter no greater than 0.5 mm and said reflected beam traversing a return optical path through said lens, said collimator, said third optical fiber, said coupler, and said second optical fiber to said optical spectrum analyzer.