Flexible digital signal processing architecture for narrowband and spread-spectrum lock-in detection in multiphoton microscopy and time-resolved spectroscopy.


Journal Article

The lock-in amplifier is a critical component in many different types of experiments, because of its ability to reduce spurious or environmental noise components by restricting detection to a single frequency and phase. One example application is pump-probe microscopy, a multiphoton technique that leverages excited-state dynamics for imaging contrast. With this application in mind, we present here the design and implementation of a high-speed lock-in amplifier on the field-programmable gate array (FPGA) coprocessor of a data acquisition board. The most important advantage is the inherent ability to filter signals based on more complex modulation patterns. As an example, we use the flexibility of the FPGA approach to enable a novel pump-probe detection scheme based on spread-spectrum communications techniques.

Full Text

Duke Authors

Cited Authors

  • Wilson, JW; Park, JK; Warren, WS; Fischer, MC

Published Date

  • March 2015

Published In

Volume / Issue

  • 86 / 3

Start / End Page

  • 033707 -

PubMed ID

  • 25832238

Pubmed Central ID

  • 25832238

Electronic International Standard Serial Number (EISSN)

  • 1089-7623

International Standard Serial Number (ISSN)

  • 0034-6748

Digital Object Identifier (DOI)

  • 10.1063/1.4916261


  • eng