Ultrafast Laser Pulse Generation by Mode Locking: MATLAB-Based Demonstrations

Goun, Alexei; Glusac, Ksenija D.

doi:10.1021/acs.jchemed.2c00981

Ultrafast Laser Pulse Generation by Mode Locking: MATLAB-Based Demonstrations

Journal Article · Tue Jan 24 00:00:00 EST 2023 · Journal of Chemical Education

DOI:https://doi.org/10.1021/acs.jchemed.2c00981· OSTI ID:2427334

Goun, Alexei ^[1]; ^[2]

Princeton Univ., NJ (United States)
Univ. of Illinois, Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Ultrafast laser spectroscopy is a valuable and increasingly accessible technique for studies of rapid chemical reactions. Critical to ultrafast spectroscopy is the concept of mode locking, a technique that enables a fixed phase relationship between laser modes, resulting in laser pulses with very short duration (in the fs or ps range). Despite the increasing importance of ultrafast lasers in chemistry, the introduction of key concepts behind their operation into the undergraduate and graduate chemistry coursework has been limited. To help the incorporation of these topics into chemistry courses, we report here a hands-on activity that helps students develop an intuitive understanding of the factors that impact electromagnetic wave evolution in optical cavities and the process of mode locking. We first provide the theoretical background by introducing cavity modes and contrasting them with well-known propagating electromagnetic waves. We then explore what happens when modes are added and how the relative phase between the modes affects their behavior. In the second section of this report, three teaching modules are provided, along with associated MATLAB codes and animated images, that can be used in the classroom to introduce concepts of cavity modes and mode locking. These teaching modules start by contrasting propagating electromagnetic waves with cavity modes and then illustrate what happens when multiple modes are present in the cavity and how the relative phase between the modes affects the overall electromagnetic field in the cavity.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2427334

Journal Information:: Journal of Chemical Education, Journal Name: Journal of Chemical Education Journal Issue: 2 Vol. 100; ISSN 0021-9584

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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physical chemistry
ultrafast lasers
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