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Resonance states of axion-like particles were searched for via four-wavemixing by focusing two-color pulsed lasers into a quasi-vacuum. Aquasi-parallel collision system that allows probing of the sub-eV mass rangewas realized by focusing the combined laser fields with an off-axis parabolicmirror. A 0.10 mJ/34 fs Ti:Sapphire laser pulse and a 0.14 mJ/9 ns Nd:YAG laserpulse were spatiotemporally synchronized by sharing a common optical axis andfocused into the vacuum system. No significant four-wave mixing signal wasobserved at the vacuum pressure of $3.7 \times 10^{-5}$ Pa , thereby providingupper bounds on the coupling-mass relation by assuming exchanges of scalar andpseudoscalar fields at a 95 % confidence level in the mass range below 0.21 eV.For this search, the experimental setup was substantially upgraded so thatoptical components are compatible with the requirements of the high-qualityvacuum system, hence enabling the pulse power to be increased. With theincreased pulse power, a new kind of pressure-dependent background photonsemerged in addition to the known atomic four-wave mixing process. This papershows the pressure dependence of these background photons and how to handlethem in the search.

Extended search for sub-eV axion-like resonances via four-wave mixing with a quasi-parallel laser collider in a high-quality vacuum system