Ultrafast optics with a mode-locked erbium fiber laser in the undergraduate laboratory

Daniel Upcraft, Andrew Schaffer, Connor Fredrick, Daniel Mohr, Nathan Parks, Andrew Thomas, Ella Sievert, Austin Riedemann, Chad W. Hoyt, R. Jason Jones

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We describe an ultrafast optics laboratory comprising a mode-locked erbium fiber laser, autocorrelation measurements, and a free-space parallel grating dispersion compensation apparatus. The gain spectrum of Er fiber provides a broad bandwidth capable of supporting sub-100 fs pulses centered near a wavelength of 1550 nm. The fiber laser design used here produces a train of pulses at a repetition rate of 55 MHz with pulse duration as short as 108 fs. The pulse duration is measured with a homebuilt autocorrelator using a simple Michelson interferometer that takes advantage of the two-photon nonlinear response of a common silicon photodiode. To compensate for temporal stretching of the short pulse due to group velocity dispersion in the fiber, an apparatus based on a pair of parallel gratings is used for pulse compression. A detailed part that lists in the supplementary material includes previously owned and common parts used by the telecommunications industry, which helps decrease costs of the laboratory. This provides a cost-effective way to introduce the principles of ultrafast optics to undergraduate laboratories.

Original languageEnglish (US)
Pages (from-to)1152-1160
Number of pages9
JournalAmerican Journal of Physics
Volume89
Issue number12
DOIs
StatePublished - Dec 1 2021

ASJC Scopus subject areas

  • General Physics and Astronomy

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