High Resolution Compact Spectrometer Based on Resonance Domain Diffractive Lens

We experimentally demonstrate a compact optical spectrometer with a resolution of up to
$\sim 0.1$
nm suitable for spectral line measurements of laser diodes. This spectrometer is based on a transmission, 4-mm in diameter, and 0.14-NA off-axis binary resonance domain diffractive lens with strong lateral and longitudinal chromatic dispersion. After calibration with a mercury–argon source and a helium–neon laser, we measured the spectrum of RGB laser diodes. The results confirm the theoretical resolution and are in good match to data from optical spectrum analyzer with 0.05-nm resolution.