Femtosecond transient absorption microspectrophotometer combined with optical trapping technique

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Abstract
A transient absorption microspectroscopic system with 200‐fs temporal and micrometer (<2.5 μm) spatial resolutions was developed by using a microscope and a laser trapping technique. A pump beam, a white‐light continuum generated by focusing an intense femtosecond laser pulse into water, and a trapping laser beam were coaxially introduced into a microscope and focused onto a sample by a reflecting objective lens. Advantages of a reflecting objective lens are discussed for the measurements of transient absorption spectra. This method was applied to a dye‐doped single liquid droplet in water and α‐ and β‐perylene single microcrystals.