PURPOSE: To monitor always the state of a sample to be measured without damaging the detection sensitivity of the sample even if the wavelength of a Raman scattered light exciting laser light is changed, by selecting a transmission wavelength position of a variable wavelength narrow-band band pass filter.
CONSTITUTION: A Raman scattered light exciting laser light 1 set to an optional wavelength is refracted at 90° by a semitransparent mirror 3 and passes through an object lens 4 and is focused on a sample 5. The laser reflected light 6 and Raman scattered light 7 generated from the sample 5 pass through the object lens 4 and the semitransparent mirror 3 and is made incident to a variable wavelength narrow-band band pass filter 8. By selecting the position in the diameter direction of the filter 8, only the laser reflected light 6 set to an optional wavelength is transmitted through the filter 8 and reaches a microscopic image monitor 13. On the other hand, the Raman scattered light 7 having a difference wavelength is reflected at 90° to the optical axis and is focused on a spectrophotometer incidence slit 15 through a condenser lens 14.
HANIYUU YOSHIAKI
HIRATSUKA YUTAKA
