“…A second orthogonal dispersive optical element separates overlapping VIPA mode orders to create a two-dimensional image. The resulting spectrum can be read out with comb-mode resolution 54,55 53,[55][56][57][58] While the interferometric and dispersive detection methods already mentioned have facilitated the bulk of comb spectroscopies relevant for chemistry, a plethora of other methods have been demonstrated and are worth brief mention here, including electro-optic sampling of THz and mid-IR comb pulses, 59,60 Vernier spectroscopy, 61,62 broadband photoacoustic spectroscopy, [63][64][65] cavity-enhanced ultrafast transient absorption, 66 Ramsey comb spectroscopy, 67 and comb-based quantum logic spectroscopy. 68,69 Some of these developments will be discussed in further detail later on in this Chapter.…”