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Electronically tunable femtosecond all-fiber optical parametric oscillator for multi-photon microscopy
Author(s): Tim Hellwig; Maximilian Brinkmann; Carsten Fallnich
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Paper Abstract

We present a femtosecond fiber-based optical parametric oscillator (FOPO) for multiphoton microscopy with wavelength tuning by electronic repetition rate tuning in combination with a dispersive filter in the FOPO cavity. The all-spliced, all-fiber FOPO cavity is based on polarization-maintaining fibers and a broadband output coupler, allowing to get access to the resonant signal pulses as well as the idler pulses simultaneously.

The system was pumped by a gain-switched fiber-coupled laser diode emitting pulses at a central wavelength of 1030 nm and an electronically tunable repetition frequency of about 2 MHz. The pump pulses were amplified in an Ytterbium fiber amplifier system with a pulse duration after amplification of 13 ps. Tuning of the idler (1140 nm - 1300 nm) and signal wavelengths (850 nm - 940 nm) was achieved by changing the repetition frequency of the pump laser by about 4 kHz. The generated signal pulses reached a pulse energy of up to 9.2 nJ at 920 nm and were spectrally broadened to about 6 nm in the FOPO by a combination of self-phase and cross-phase modulation. We showed external compression of the idler pulses at 920 nm to about 430 fs and appleid them to two-photon excitation microscopy with green fluorescent dyes.

The presented system constitutes an important step towards a fully fiber-integrated all-electronically tunable and, thereby, programmable light source and already embodies a versatile and flexible light source for applications, e.g., for smart microscopy.

Paper Details

Date Published: 23 February 2018
PDF: 5 pages
Proc. SPIE 10498, Multiphoton Microscopy in the Biomedical Sciences XVIII, 1049823 (23 February 2018); doi: 10.1117/12.2284380
Show Author Affiliations
Tim Hellwig, Univ. of Münster (Germany)
Maximilian Brinkmann, Univ. of Münster (Germany)
Carsten Fallnich, Univ. of Münster (Germany)

Published in SPIE Proceedings Vol. 10498:
Multiphoton Microscopy in the Biomedical Sciences XVIII
Ammasi Periasamy; Peter T. C. So; Karsten König; Xiaoliang S. Xie, Editor(s)

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