Patent ID: 9625389
Date: 2017-04-18
CPC Classifications: G01N

Claim:
1. An optical measuring device comprising: a sample stage that holds a sample; a controller configured to control the optical measuring device; a laser source configured to emit a laser beam; a beam splitter configured to split the laser into a pump beam and a beam to be generated to a Stokes beam, the Stokes beam having a wavelength longer than that of the pump beam; a polarization beam splitter configured to receive the pump beam and to split the pump beam into first polarized components and second polarized components, the second polarized components being a reference beam; a dichroic mirror configured to reflect the first polarized components of the pump beam to coaxially combine the first polarized components of the pump beam with the Stokes beam into a combined beam; an objective lens configured to focus the combined beam onto the sample held on the sample stage; the controller is configured to control a relative position between the objective lens and the sample held on the sample stage; a phase sensor configured to identify a surface position of the sample by causing a reflected beam from the sample that has passed through the objective lens and the reference beam to interfere with each other and detect an intensity of the reflected beam and/or a phase of the reflected beam with respect to the reference beam; and a detector configured to detect a reflected CARS beam generated from the sample.