Accession Number : AD1051374


Title :   Bright THz Instrument and Nonlinear THz Science


Descriptive Note : Technical Report,21 Jul 2016,30 Jul 2017


Corporate Author : University of Rochester Rochester United States


Personal Author(s) : Zhang, Xi-Cheng


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1051374.pdf


Report Date : 30 Oct 2017


Pagination or Media Count : 13


Abstract : One of our most significant achievements under this grant is the achievement of broadband THz wave emission from a thin water film due to short laser pulses excitation. THz wave generation from solids, gases, and plasmas have been demonstrated previously. However, THz wave generation from liquid materials, especially from a polar liquid such as water, has never been reported. For developing bright, high performance and cost effective THz sources, liquid water is a promising choice. As one of the common condensed matter, liquid water has higher molecular density than gas, which could provide a plasma with higher density than one formed from a gas. Additionally, because each laser pulse interacts with a new section of water film, there is no theoretical upper damage threshold as there is in solid crystals. Our results have been published in Applied Physics Letters in August 2017. Our discovery has been highlighted by the American Physics Societys SciLight, Phys.org, Laser Focus World, Photonics Media, and many other public presses.


Descriptors :   broadband , TERAHERTZ RADIATION , laser pulses , high density , waveforms , refractive index , spectroscopy , polarization


Subject Categories : Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE