Abstract

It is shown that absolute two-photon fluorescence excitation (TPE) cross-sections can be obtained without prior knowledge of the temporal profile of the excitation pulse by measuring the fluorescence generated using two spatially superimposed but temporally shifted halves of the excitation beam as a function of their relative delay. Measurements employed a Michelson interferometer with a mode-locked Ti:sapphire laser as the excitation source. The TPE cross-section for fluorescein ( ) obtained at 782 nm with this technique agrees with single-mode CW Ti:sapphire excitation data. We find no indication for a deviation from the power-squared dependence of TPE.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR004224-09
Application #
5224751
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
9
Fiscal Year
1996
Total Cost
Indirect Cost

  Publications

Migone, Fernando F; Cowan, Robert G; Williams, Rebecca M et al. (2016) In vivo imaging reveals an essential role of vasoconstriction in rupture of the ovarian follicle at ovulation. Proc Natl Acad Sci U S A 113:2294-9
O'Dell, Ryan S; Cameron, David A; Zipfel, Warren R et al. (2015) Reelin Prevents Apical Neurite Retraction during Terminal Translocation and Dendrite Initiation. J Neurosci 35:10659-74
Byrnes, Laura J; Singh, Avtar; Szeto, Kylan et al. (2013) Structural basis for conformational switching and GTP loading of the large G protein atlastin. EMBO J 32:369-84
Jain, Manu; Robinson, Brian D; Scherr, Douglas S et al. (2012) Multiphoton microscopy in the evaluation of human bladder biopsies. Arch Pathol Lab Med 136:517-26
Degala, Satish; Williams, Rebecca; Zipfel, Warren et al. (2012) Calcium signaling in response to fluid flow by chondrocytes in 3D alginate culture. J Orthop Res 30:793-9
O'Dell, Ryan S; Ustine, Candida J M; Cameron, David A et al. (2012) Layer 6 cortical neurons require Reelin-Dab1 signaling for cellular orientation, Golgi deployment, and directed neurite growth into the marginal zone. Neural Dev 7:25
McMullen, J D; Kwan, A C; Williams, R M et al. (2011) Enhancing collection efficiency in large field of view multiphoton microscopy. J Microsc 241:119-24
Kim, Sally A; Sanabria, Hugo; Digman, Michelle A et al. (2010) Quantifying translational mobility in neurons: comparison between current optical techniques. J Neurosci 30:16409-16
Bowles, Robby D; Williams, Rebecca M; Zipfel, Warren R et al. (2010) Self-assembly of aligned tissue-engineered annulus fibrosus and intervertebral disc composite via collagen gel contraction. Tissue Eng Part A 16:1339-48
McMullen, Jesse D; Zipfel, Warren R (2010) A multiphoton objective design with incorporated beam splitter for enhanced fluorescence collection. Opt Express 18:5390-8

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