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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Phase-synchronous detection of coherent and incoherent nonlinear signals

Author

  • Khadga Jung Karki
  • Loni Kringle
  • Andrew H. Marcus
  • Tönu Pullerits

Summary, in English

The nonlinear optical response of a material system contains detailed information about its electronic structure. Standard approaches to nonlinear spectroscopy often use multiple beams crossed in a sample, and detect the wave vector matched polarization in transmission. Here, we apply a phase-synchronous digital detection scheme using an excitation geometry with two phase-modulated collinear ultrafast pulses. This scheme can be used to efficiently detect nonlinear coherent signals and incoherent signals, such as higher harmonics and multiphoton fluorescence and photocurrent, from various systems including a photocell device. We present theory and experiment to demonstrate that when the phase of each laser pulse is modulated at the frequency phi(1) and phi(2), respectively, nonlinear signals can be isolated at the frequencies n(phi(2) - phi(1)), where n = 0, 1, 2, ... . This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2016

Language

English

Publication/Series

Journal of Optics

Volume

18

Issue

1

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • nonlinear optics
  • ultrafast optics
  • phase-modulation

Status

Published

ISBN/ISSN/Other

  • ISSN: 2040-8986