Photographic film has commonly been exposed by a single-photon absorption mechanism. We determine the conditions for film exposure by direct two-photon absorption. Using subpicosecond laser pulses, we find that two-photon exposure for commercial film has a threshold fluence and an intensity of 0.0008 J/cm<sup>2</sup> and 0.0066 TW/cm<sup>2</sup>, respectively, well below the optical damage threshold. Multiphoton photography has the potential for higher spatial resolution and affords an opportunity for three-dimensional image storage.
© 1999 Optical Society of America
Pu-Wei Wu, Bruce Dunn, Eli Yablonovitch, Vinh Doan, and Benjamin J. Schwartz, "Two-photon exposure of photographic film," J. Opt. Soc. Am. B 16, 605-608 (1999)