High-resolution mid-IR spectra of methanol and dimethyl sulfide obtained with interleaved subharmonic OPO combs

We use a pair of highly-coherent subharmonic optical parametric oscillators (instantaneous span 3.2-5.4 μm) to obtain the first to our knowledge high-resolution (0.002cm ^-1 ) mid-infrared spectra of methanol (CH 3 OH) and dimethyl sulfide (CH 3 ) 2 S via interleaving comb-tooth-resolved spectra.