Abstract
Combined absorption–emission spectroscopy is demonstrated using a
single VIPA spectrometer coupled to a supercontinuum source. The
system captures a ~36 nm bandwidth (742–778 nm) at picometer
resolution. In a low-pressure glow discharge, N
2
emission
calibration, O I 777 nm triplet absorption (2.2% consistency), and
linewidth analysis distinguishing instrumental/Doppler broadening from
Ar I self-absorption (broadening factors up to ~1.5) are performed.
Joint retrieval of temperature (953 ± 49 K) and instrumental width,
along with time-division absorption–emission measurements, is
demonstrated. Long-term stability makes this approach suitable for
quasi-steady plasmas.