Open AccessUltrafast time-resolved fluorescence by two photon absorption excitation
Author(s) -
Chul Hoon Kim,
Taiha Joo
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.020742
Subject(s) - photon upconversion , optics , fluorescence , materials science , absorption (acoustics) , ultrashort pulse , time resolved spectroscopy , excitation , wavelength , full width at half maximum , fluorescence correlation spectroscopy , laser , physics , quantum mechanics
We report a time-resolved fluorescence apparatus utilizing fluorescence upconversion by noncollinear sum frequency generation and two photon absorption as an excitation. Near perfect time-resolution is achieved with 20 fs pulses to give the instrument response of 33 fs (FWHM) over the entire fluorescence wavelength for a 100 microm thick mixing crystal. Through experiments and numerical simulations, it is shown that 40 fs time-resolution can be obtained even for a 580 microm thick mixing crystal at a fluorescence wavelength longer than 500 nm.