Near-infrared (NIR) femtosecond laser microscope with Cr:Forsterite laser at ca. 1.26 μm output wavelength was constructed and applied to two-, three- and four-photon imaging of gold nanoparticle and some organic micro crystals. The ultrafast pulse duration of 35 fs after passing through the objectives easily induced higher-order multiphoton absorption. The size of the laser focal spot and the resolution along the optical axis were discussed by comparing the present higher-order multiphoton imaging and two-photon induced processes.
|Number of pages||6|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|State||Published - 25 Oct 2006|
- Chromium:forsterite laser
- Four-photon imaging
- Near-infrared femtosecond microscopy
- Three-photon imaging