Apparatuses, systems, and methods for sample testing

A computer-implemented method comprising:

• triggering a light source calibration event associated with a light source component;
• capturing reference interference fringe data representing a reference interference fringe pattern in a sample environment, the reference interference fringe pattern projected via a reference channel of a waveguide, wherein the waveguide comprises a sample channel;
• comparing the reference interference fringe data with stored calibration interference data to determine a refractive index offset between the reference interference fringe data and the stored calibration interference data;
• tuning the light source component based on the refractive index offset;
• receiving first interference fringe data for an unidentified sample medium, the first interference fringe data associated with a first wavelength;
• receiving second interference fringe data for the unidentified sample medium, the second interference fringe data associated with a second wavelength;
• deriving refractive index curve data based on the first interference fringe data associated with the first wavelength and the second interference fringe data associated with the second wavelength;
• determining an operating temperature associated with the unidentified sample medium;
• querying a refractive index database based on at least the refractive index curve data and the operating temperature to determine a sample identity data, wherein the refractive index database stores a plurality of known refractive index curves associated with a plurality of identified samples and corresponding temperature data;
• and
• determining the sample identity data based on a match between the refractive index curve data and stored refractive index curves at the operating temperature.