On Monday 18th December A/Prof. Michelle Sander will be visiting Imperial College London to give a seminar titled Dual-output ultrafast thulium fiber
laser and applications in mid-infrared
vibrational photothermal imaging. The talk will take place at 2pm in Room 630 of Blackett Laboratory, Prince Consort Road, SW7 2AZ.
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, the BU-BUMC Cancer Center, the Center for Neurophotonics and the BU Nanotechnology Center. She received her PhD in Electrical Engineering from the Massachusetts Institute of Technology in the Optics and Quantum Electronics Group. Previously, she graduated with a German Diploma degree in Electrical Engineering and a Master of Science degree from the Georgia Institute of Technology. Her research interests include the development of innovative novel ultrafast fiber lasers, characterization of femtosecond dynamics, and applications to vibrational spectroscopy and biomedical imaging. A/Prof. Sander received an AFOSR Young Investigator Award, is the recipient of two BU Dean’s Catalyst Awards and the BU Nanotechnology Innovation Center Award. In 2017, she serves as an OSA Ambassador.
Dual-output ultrafast lasers pave a promising pathway towards compact single sources for high precision metrology and dual comb spectroscopy. Based on vector soliton dynamics, a compact fiber laser with co-generated, orthogonally polarized interlaced pulses will be presented. Further, self-organized multiple pulsing operation will be discussed in turn-key, compact thulium fiber lasers. With operation the eye-safe wavelength region from 1.7 µm to 2.2 µm, these femtosecond thulium fiber lasers are attractive for applications in gas/environmental sensing, biomedical diagnosis and surgery and nonlinear conversion.
The second part of this talk will focus on mid-infrared vibrational photothermal spectroscopy in the fingerprint region (at wavelengths ~5μm and longer), which can reveal characteristic details about molecular compounds with high sensitivity and specificity. A novel nonlinear photothermal operating regime with characteristic spectral narrowing, bifurcation and strong enhancements will be presented as a new pathway for material characterization. This technique can offer sub-diffraction limited imaging resolution and can be applied to analyze the secondary protein conformations in biomedical tissue.