
1.Department of Biomedical Engineering, The University of Texas at Austin, TX 78712, USA
2.Department of Physics, The University of Texas at Austin, TX 78712, USA
3.MQ Photonics, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia
AK Dunn, Email: adunn@utexas.edu
Published:2017-12,
Published Online:01 June 2017,
Received:21 December 2016,
Revised:22 May 2017,
Accepted:31 May 2017
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Perillo, E. P. et al. Two-color multiphoton in vivo imaging with a femtosecond diamond Raman laser. Light: Science & Applications, 6, e17095 (2017).
Perillo, E. P. et al. Two-color multiphoton in vivo imaging with a femtosecond diamond Raman laser. Light: Science & Applications, 6, e17095 (2017). DOI: 10.1038/lsa.2017.95.
Two-color multiphoton microscopy through wavelength mixing of synchronized lasers has been shown to increase the spectral window of excitable fluorophores without the need for wavelength tuning. However
most currently available dual output laser sources rely on the costly and complicated optical parametric generation approach. In this report
we detail a relatively simple and low cost diamond Raman laser pumped by a ytterbium fiber amplifier emitting at 1055 nm
which generates a first Stokes emission centered at 1240 nm with a pulse width of 100 fs. The two excitation wavelengths of 1055 and 1240 nm
along with the effective two-color excitation wavelength of 1140 nm
provide an almost complete coverage of fluorophores excitable within the range of 1000–1300 nm. When compared with 1055 nm excitation
two-color excitation at 1140 nm offers a 90% increase in signal for many far-red emitting fluorescent proteins (for ex
ample
tdKatushka2). We demonstrate multicolor imaging of tdKatushka2 and Hoechst 33342 via simultaneous two-color two-photon
and two-color three-photon microscopy in engineered 3D multicellular spheroids. We further discuss potential benefits and applications for two-color three-photon excitation. In addition
we show that this laser system is capable of
in vivo
imaging in mouse cortex to nearly 1 mm in depth with two-color excitation.
microscopynonlinear processesthree-dimensional imagingultrafast lasers
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