News

news and press coverage of work by our group


The article"Snapshots of laser wakefields" appeared in the Physics Update section of Physics Today 59, 28 (December 2006). The article featured work on visualization of laser wakefield structures by our group published in Matlis et al., "Snapshots of laser wakefields," Nature Physics 2, 749 (2006) and Maksimchuk et al.,Physics of Plasmas 15, 056703 (2008), including a picture from that work.


The article "Snapshots of laser wakefields" appeared in the Recent Topics section of Butsuri ("Physics") 62 (9) (September 2007), also featuring work on visualization of laser wakefields by our group.  Butsuri is the major physics magazine of Japan, equivalent to Physics Today


A. E. Braun, Senior Editor, "Light-Matter Interaction to Improve Semiconductor Interfaces", in Semiconductor International (May 12, 2008).  

Describes a recent bond model of optical second-harmonic generation from semiconductor interfaces developed by Prof. Dave Aspnes (North Carolina State U.).  The article notes "Stimulus for [Aspnes'} investigation came from work by Professor Michael Downer's group at the University of Texas at Austin. Downer's group examined silicon nanospheres in glass and reported considerable enhancement of SHG signals.


The article "Laser Particle Accelerator:  its Principle and Future" by Prof. Yoneyoshi Kitagawa appeared in the Japanese journal "Kogaku" ("Optics"), the principle Japanese optics magazine.  The article prominently featured work on visualization of laser wakefield structures by our group published in Matlis et al., "Snapshots of laser wakefields," Nature Physics 2, 749 (2006), including pictures from that work. 


One of the "snapshots" of laser wakefields from our work Matlis et al., "Snapshots of laser wakefields," Nature Physics 2, 749 (2006) was published with permission in the new book "The Plasma Universe" (Cambridge University Press 2008). 


Terawatt Lab Renovation

High-intensity research in Mike Downer’s group is conducted in the 1200 square foot Room 2.408 of Robert Lee Moore Hall on the UT campus.   Since the mid-1990s this lab housed a home-built 5 TW Ti:S chirped-pulse amplification system synchronized to a 1J, 400 ps Nd:YAG laser-amplifier, and more recently a 3 mJ, 100 fs, 870 nm chirped pulse Raman amplifier {link to F. Grigsby’s paper under “Publications”}. This laboratory routinely experienced temperature swings of  ±10 F, and controlled particulates with a home-built HEPA filter system without monitors.  State-of-the-art terawatt lasers, however, require much stricter environmental standards.  Accordingly, we developed and implemented plans to upgrade this laboratory to a clean room along the following time table:

May 2006: University of Texas committed $700K funds to clean room construction.  
   
Summer&Fall 2006: technical planning of clean room
April 2, 2007: University of Texas issued formal bid invitation. 
April 23, 2007: Contract awarded to M. W. Morgan Construction, Inc. 
June 2007: Ti:S system decommissioned, Nd:YAG and Raman-shifted subsystems stored, and construction began on a class 100,000 clean room.
October 2007: Clean room completed.  Tested and certified at class 10,000, exceeding specifications. Visit our Clean Room construction photo gallery

 

The major specifications of the new clean room are:

  1. 1200 sq. ft. total, including 9 x9 ft gown room,
  2. 16 x 12 ft mechanical room outside clean room housing laser power supplies & air-handling unit
  3. Class 10,000 (NF EN ISO 14644-1:1999 Class 8);
  4. 12 air changes per minute Temperature set point 69F ± 1 F tolerance
  5. Humidity control 50% RH max.

In February 2008, a new commercial 45 TW, 25 fs Ti:S chirped-pulse amplification system manufactured by THALES Laser (Model Alpha 10/XS 45 TW) will be installed in the clean room, and will be the principal laser system for our high-intensity research. The 1J, 400 ps Nd:YAG laser-amplifier and 10 mJ, 100 fs, 870 nm chirped pulse Raman amplifier subsystems will be re-synchronized with the new Ti:S system to constitute the University of Texas Tri-Color Terawatt (UT3) system