Optomechanical Shutter Modulated Broad-Band Cavity−Enhanced Absorption Spectroscopy of Molecular Transients of Astrophysical Interest

摘要: We describe a sensitive spectroscopic instrument capable of measuring broad-band absorption spectra through supersonically expanding planar plasma pulses. The utilizes incoherent cavity-enhanced spectroscopy (IBBCEAS) and incorporates an optomechanical shutter to modulate light from continuous source, enabling measurements durations as low ∼400 μs. expansion is used mimic conditions in translucent interstellar clouds. new setup particularly applicable test proposed carriers the diffuse bands, it permits swift over broad spectral range with resolution comparable astronomical observations. sensitivity estimated be better than 10 ppm/pass, measured effective exposure time only 1 s.