Multimode Fibers: Endoscopic Imaging

We are using adaptive optics to control the field distribution at the input of a multimode fiber, allowing a desired field distribution to be created in the three-dimensional space near the fiber output. We are exploring several applications, including: scanning microscopy (e.g., for minimally invasive endoscopy), targeted light delivery (e.g., for optogenetics), and sensor multiplexing. We have demonstrated a microscopy technique in which the number of resolvable image features approaches four times the number of spatial modes propagating in the fiber and have analytically derived resolution limits for multi-mode fiber imaging, showing how these are related to corresponding limits for conventional imaging systems.

R. Y. Gu, E. S. Chou, C. Rewcastle, O. Levi and J. M. Kahn, "Improved Spot Formation through Flexible Multimode Fiber Using a Partial Reflector", Proc. of Conf. on Lasers and Electro-Optics, San Jose, CA, May 13-18, 2018. PDF

R. Y. Gu, R. Nasiri Mahalati and Joseph M. Kahn, "Design of Flexible Multi-Mode Fiber Endoscope", Optics Express, vol. 23, no. 21, pp. 26905-26918, October 19, 2015. PDF

R. Y. Gu, R. Nasiri Mahalati and Joseph M. Kahn, "Noise-Reduction Algorithms for Optimization-Based Imaging through Multi-Mode Fiber", Optics Express, vol. 22, no. 12, pp. 15118-15132, June 12, 2014. PDF

R. Nasiri Mahalati, R. Y. Gu and J. M. Kahn, "Resolution Limits for Imaging through Multi-Mode Fiber", Optics Express, vol. 21, no. 1, pp. 1656-1668, January 14, 2013. PDF Featured in OSA's Spotlight on Optics, March 2013; Stanford Report, March 14, 2013; and numerous media outlets worldwide.

R. Nasiri Mahalati, D. Askarov, J. P. Wilde and J. M. Kahn, "Adaptive Control of Input Field to Achieve Desired Output Intensity Profile in Multimode Fiber with Random Mode Coupling", Optics Express, vol. 20, no. 13, pp. 14321-14337, June 18, 2012. PDF

K. J. Boucher, C. Jan, J. M. Kahn, J. P. Wilde, and O. Solgaard, "Spot Formation and Scanning Microscopy via Multimode Fibers", Proc. of IEEE Photonics 2011 Conference, Arlington, VA, October 9-13, 2011.

Return to Joseph M. Kahn's home page.

Last modified: August 12, 2019.