Andrew J. Howard received his B.S. in Optics from the University of Rochester in 2019. During his time at Rochester, he served as a Research Assistant in the ultrafast group at the Laboratory for Laser Energetics. He was awarded the Charles L. Newton Prize for his work. In late 2019, Howard enrolled in the Applied Physics Ph.D. program at Stanford University and was named the Albion Walter Hewlett Fellow. Here he studies experimental strong-field physics and ultrafast laser-driven molecular dynamics. He currently specializes in 3D fragment-momentum imaging, in which the three-dimensional momentum of molecular fragments produced during the interaction between a laser and a molecule yields valuable information about femtosecond molecular processes and light-matter interactions.

Honors & Awards

  • Albion Walter Hewlett Fellowship, Stanford University (2019)
  • Charles L. Newton Prize, University of Rochester (2019)
  • Robert L. Wells Prize, University of Rochester (2019)

Education & Certifications

  • B.S., The Institute of Optics, University of Rochester, Optics (2019)
  • Minor, University of Rochester, Italian (2019)

All Publications

  • Strong-field ionization of water: Nuclear dynamics revealed by varying the pulse duration PHYSICAL REVIEW A Howard, A. J., Cheng, C., Forbes, R., McCracken, G. A., Mills, W. H., Makhija, Spanner, M., Weinacht, T., Bucksbaum, P. H. 2021; 103 (4)
  • Photon Acceleration in a Flying Focus PHYSICAL REVIEW LETTERS Howard, A. J., Turnbull, D., Davies, A. S., Franke, P., Froula, D. H., Palastro, J. P. 2019; 123 (12): 124801


    A high-intensity laser pulse propagating through a medium triggers an ionization front that can accelerate and frequency upshift the photons of a second pulse. The maximum upshift is ultimately limited by the accelerated photons outpacing the ionization front or the ionizing pulse refracting from the plasma. Here, we apply the flying focus-a moving focal point resulting from a chirped laser pulse focused by a chromatic lens-to overcome these limitations. Theory and simulations demonstrate that the ionization front produced by a flying focus can frequency upshift an ultrashort optical pulse to the extreme ultraviolet over a centimeter of propagation. An analytic model of the upshift predicts that this scheme could be scaled to a novel tabletop source of spatially coherent x rays.

    View details for DOI 10.1103/PhysRevLett.123.124801

    View details for Web of Science ID 000487743500009

    View details for PubMedID 31633954

  • Time-resolved site-selective imaging of predissociation and charge transfer dynamics: the CH3I B-band JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS Forbes, R., Allum, F., Bari, S., Boll, R., Borne, K., Brouard, M., Bucksbaum, P. H., Ekanayake, N., Erk, B., Howard, A. J., Johnsson, P., Lee, J. L., Manschwetus, B., Mason, R., Passow, C., Peschel, J., Rivas, D. E., Roerig, A., Rouzee, A., Vallance, C., Ziaee, F., Rolles, D., Burt, M. 2020; 53 (22)
  • Momentum-resolved above-threshold ionization of deuterated water PHYSICAL REVIEW A Cheng, C., Forbes, R., Howard, A. J., Spanner, M., Bucksbaum, P. H., Weinacht, T. 2020; 102 (5)
  • Flying focus: Spatial and temporal control of intensity for laser-based applications PHYSICS OF PLASMAS Froula, D. H., Palastro, J. P., Turnbull, D., Davies, A., Nguyen, L., Howard, A., Ramsey, D., Franke, P., Bahk, S., Begishev, I. A., Boni, R., Bromage, J., Bucht, S., Follett, R. K., Haberberger, D., Jenkins, G. W., Katz, J., Kessler, T. J., Shaw, J. L., Vieira, J. 2019; 26 (3)

    View details for DOI 10.1063/1.5086308

    View details for Web of Science ID 000462916300011