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We study coherent anti-Stokes Raman spectroscopy in air-filled anti-resonancehollow-core photonic crystal fiber, otherwise known as 'revolver' fiber. Wecompare the vibrational coherent anti-Stokes Raman signal of N$_2$, at 2331cm$^{-1}$, generated in ambient air (no fiber present), with the one generatedin a 2.96 cm of a revolver fiber. We show a 170 times enhancement for thesignal produced in the fiber, due to an increased interaction path. Remarkably,the N$_2$ signal obtained in the revolver fiber shows near-zero non-resonantbackground, due to near-zero overlap between the laser field and the fibercladding. Through our study, we find that the revolver fiber properties make itan ideal candidate for the coherent Raman spectroscopy signal enhancement.

Background-penalty-free waveguide enhancement of CARS signal in air-filled anti-resonance hollow-core fiber