Fringe-averaged collinear frequency-resolved optical gating: in situ characterization of ultrashort pulses in nonlinear microscopy

Author:

Frackleton Leah1ORCID,Harper Alexander N.1ORCID,Latorre Malcolm,Pegoraro Adrian F.2ORCID,Stolow Albert134,Shivkumar SiddarthORCID

Affiliation:

1. Max-Planck-uOttawa Centre for Extreme and Quantum Photonics

2. Metrology Research Centre, National Research Council of Canada

3. NRC-uOttawa Joint Centre for Extreme Photonics

4. Quantum and Nanotechnologies Research Centre, National Research Council of Canada

Abstract

In situ characterization of the electric field of ultrafast pulses is critical in multiphoton microscopy. Although second harmonic generation-based collinear Frequency-Resolved Optical Gating (FROG) addresses this need, the interferometric measurement is challenged by interferometric drift instability, the required high sampling density of the acquired data, and the inability to directly use the interferometric data with conventional FROG retrieval algorithms. We address these issues by combining low-pass Fourier filtering with active kHz dithering of the interferometric path length difference using a piezo-driven retroreflector. We demonstrate successful electric field retrieval for pulses of variable duration (∼100 fs-3 ps), in situ characterization of a chirped pulse in a nonlinear microscope, and a significant reduction in acquisition time, without loss of resolution, by undersampling.

Funder

National Research Council Canada

Natural Sciences and Engineering Research Council of Canada

Canada Research Chairs

Max-Planck-uOttawa Centre for Extreme and Quantum Photonics

Publisher

Optica Publishing Group

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