Friday, March 24, 2017
4:00pm – 5:00pm
Gant Science Complex, Physics, Room PB-38
Prof. Michelle Sander, Boston University.
Dynamics in High Repetition Rate Ultrafast Fiber Lasers and Applications in Mid-Infrared Vibrational Photo Thermal Imaging
Thulium(Tm)/Holmium(Ho) co-doped fibers have recently moved into the focus of research due to a broadband gain emission window around 2µm and attractive applications in spectroscopy, LIDAR, biomedical treatment and diagnosis. In this talk, we will outline pathways to achieve low noise, high repetition rate ultrafast lasers in a versatile linear Tm/Ho fiber laser cavity that is directly core-pumped with 790nm at the gain fiber peak absorption. Single pulse stable mode-locking with around 300fs duration and high harmonic mode-locked states will be discussed.
In the second part of the talk we will focus on a mid-infrared photothermal spectroscopy system that combines a mid-infrared quantum cascade laser with one of our custom-designed fiber laser. Mid-infrared spectral imaging in the fingerprint region (at wavelengths ~5μm and longer) can reveal characteristic details about molecular compounds and secondary structure of chemicals and biomolecules. A contact-less, non-destructive mid-infrared imaging system with high sensitivity and specificity based on vibrational photothermal spectroscopy will be presented. Scaling of the pump power a nonlinear photothermal spectroscopy regime promises a novel multi-dimensional characterization method for materials with enhanced sensitivity with improved spatial resolution. Applications of the presented system can range from chemical trace hazardous material detection, to identification of neurodegenerative diseases based on secondary protein configurations, remote sensing and process control.
Brief bio: Dr. Michelle Sander is an assistant professor in the Department of Electrical and Computer Engineering at Boston University and an affiliated faculty with the Materials Science and Engineering Division. She is a member of the BU Photonics Center and the BU-BUMC Cancer Center. She received her PhD in Electrical Engineering from the Massachusetts Institute of Technology in the Optics and Quantum Electronics Group with Prof. Erich Ippen and Prof. Franz Kaertner. She received an AFOSR Young Investigator Award in 2016, a Dean’s Catalyst Award in 2014 and a Material’s Science and Engineering Innovation Award in 2016. For 2017, she is an Ambassador for the Optical Society of America and she is a subcommittee program chair for the CLEO conference.
Contact: Prof. Roychoudhuri
Physics Department (primary)
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