High-power femtosecond mid-IR sources for s-SNOM applications

We demonstrate two high-power femtosecond mid-infrared (mid-IR) sources that can be combined with a scattering-type scanning near-field optical microscope (s-SNOM). The first one is based on difference frequency generation (DFG) between the two signal wavelengths of a high-power dual-signal-waveleng...

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Bibliographic Details
Published in:Journal of optics (2010) 2014-09, Vol.16 (9), p.94003
Main Authors: Hegenbarth, R, Steinmann, A, Mastel, S, Amarie, S, Huber, A J, Hillenbrand, R, Sarkisov, S Y, Giessen, H
Format: Article
Language:English
Subjects:
difference frequency generation
nonlinear optics
optical parametric oscillators
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Summary:We demonstrate two high-power femtosecond mid-infrared (mid-IR) sources that can be combined with a scattering-type scanning near-field optical microscope (s-SNOM). The first one is based on difference frequency generation (DFG) between the two signal wavelengths of a high-power dual-signal-wavelength periodically poled lithium niobate (PPLN) optical parametric oscillator (OPO) and covers the spectral range from 10.5 m to 16.5 m. The second one is an AgGaSe2 OPO pumped by the PPLN OPO. With this mid-IR OPO we obtained up to 113 mW average idler power at 4857 nm with more than 40 cm−1 FWHM spectral width. We demonstrate mid-IR near-field spectra and near-field images that we obtained by combining the broadband femtosecond mid-IR DFG source with an s-SNOM.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8978/16/9/094003