Photonic crystal fiber as a tunable light source for visible wavelength two-photon microscopy

Jonathan A. Palero; Vincent O. Boer; Jacob C. Vijverberg; Henricus J. C. M. Sterenborg; Hans C. Gerritsen

doi:10.1117/12.642248

23 February 2006 Photonic crystal fiber as a tunable light source for visible wavelength two-photon microscopy

Jonathan A. Palero, Vincent O. Boer, Jacob C. Vijverberg, Henricus J. C. M. Sterenborg, Hans C. Gerritsen

Proceedings Volume 6089, Multiphoton Microscopy in the Biomedical Sciences VI; 60890T (2006) https://doi.org/10.1117/12.642248
Event: SPIE BiOS, 2006, San Jose, California, United States

Abstract

Two-photon microscopy revolutionized deep and live tissue imaging. It uses near-infrared femtosecond-pulsed laser sources, usually Ti:Sa lasers, to excite fluorescence. Several endogenous and synthetic fluorophores are, however, excited with wavelengths shorter than 360 nm, including NADH, tryptophan and the ratiometric Ca²⁺ indicators. Efficient two-photon excitation imaging of these endogenous fluorophores is difficult at present due to the lack of suitable laser sources. To address these concerns, we investigated the use of photonic crystal fibers as a laser source for visible wavelength two-photon microscopy. The high nonlinearity of the photonic crystal fibers leads to supercontinuum generation that can span the visible to the near-infrared spectral regions. We investigated the spectral and temporal properties of photonic crystal fibers excited by a near-infrared femtosecond Ti:Sa laser. Our results show that the fiber emission can be tuned by variation of laser excitation wavelength and laser intensity. Our autocorrelation measurements show that the pulse duration of the PCF nonsolitonic radiation is in the order of a few picoseconds. We also demonstrate the application of the photonic crystal fiber output to two-photon microscopy of tryptophan.

Citation Download Citation

Jonathan A. Palero, Vincent O. Boer, Jacob C. Vijverberg, Henricus J. C. M. Sterenborg, and Hans C. Gerritsen "Photonic crystal fiber as a tunable light source for visible wavelength two-photon microscopy", Proc. SPIE 6089, Multiphoton Microscopy in the Biomedical Sciences VI, 60890T (23 February 2006); https://doi.org/10.1117/12.642248

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KEYWORDS

Visible radiation

Luminescence

Photonic crystal fibers

Solitons

Microscopy

Picosecond phenomena

Light sources

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