Fig. 1. Schematic diagram of a divergent beam incident on the filter

Fig. 2. Influences of some errors on transmission spectra of standard multi-cavity structure

Fig. 3. Optimized multi-cavity structure of narrow bandpass filter

Fig. 4. Influences of some errors on transmission spectra of optimized multi-cavity structure

Fig. 5. Measured transmission spectra and simulated result of narrow-band filter specimen under normal incidence

Fig. 6. Comparison of transmittance spectra between measured by two types of spectrophotometers and simulated by the model

Fig. 7. Comparison of central wavelength and FWHM between measured by two types of spectrophotometers and simulated by the model

Fig. 8. Comparison between measured and simulated results with different divergence half-angles and linewidths under 0° and 17° incidence (measured by Cary 7000)