Patent ID: 9068940
Filing Date: 2015-06-30
Classification: G01J,G01N

Abstract:
1. An apparatus for differential optical dispersion using a first sample and a second sample, the apparatus comprising: a single frequency chirped laser source configured to generate a single frequency chirped laser beam; a first beam splitter configured to split the single frequency chirped laser beam into first and second optical branches, the first sample being located in the first optical branch, the second sample being located in the second optical branch; a frequency shifter located in the second optical branch, downstream of the second sample; a second beam splitter configured to combine the first and second optical branches and generate a chirp-modulated mixed light beam; a square law detector configured to detect the chirp-modulated mixed light beam and generate a heterodyne beatnote signal; and a demodulator configured for demodulation of the heterodyne beatnote signal to generate a differential optical dispersion spectrum.