Characteristics of changes in the optical properties of multilayer coatings with oblique incidence of radiation

Compact Fluorescence Spectrometer with Built-In In-Line Calibration: Application to Detect Dissolved Organic Matter in Water

“…Due to the restriction by the black aperture, only the fluorescence output from the MC outlet with the divergence angle less than 22°can be detected. According to the previous reports, 31,32 the operating wavelength of the Bragg filter was only shifted by ∼1.5% with an oblique incident angle of 22°, i.e., the corresponding wavelength shift is 5−8 nm, which would be acceptable for ISCS-FS.…”

“…The filters (based on the Bragg mirror) employed in the ISCS-FS apparatus (i.e., LVF, band-pass filters, and long-pass filters) are designed to operate with vertically incident light. , Thus, a black aperture with a hole diameter of 1.6 mm (equal to the inner diameter of MC) was attached on the long-pass filter behind the MC outlet, and the distance between the black aperture and MC outlet is ∼4 mm (Figure A). Due to the restriction by the black aperture, only the fluorescence output from the MC outlet with the divergence angle less than 22° can be detected.…”