U3

U3
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Images
City

U³

Specifications:

U³ = Ultrafast, Ultra-powerful, Ultra-intense
(also) = Ultrafast, Ultrabright and high Utility
Wilson·Squier Group,
University of California San Diego
[ Images ] [ City ]

1.2 J, 23.5 fs, 60 TW at 10 Hz
150 mJ, < 20 fs, 8 TW at 20 Hz
100 mJ, 18 fs, 5 TW peak at 50 Hz (5 W average)
2.2 J, 800 nm
1.4 <M² < 2
10²¹ W cm^-2

Lab table (in the dark) from UCSD U3 Ultra-powerful Ultra-intense Laser System (see smaller version)
Lab with lights on from UCSD U3 Ultra-powerful Ultra-intense Laser System (see smaller version)
Diagram from UCSD U3 Ultra-powerful Ultra-intense Laser System
U³ laser
U³ slide show (smaller versions of above images)
Diagram of Laser chain: (from Barty, 1998)
Diagram of earlier version of laser from Laser Focus World, June 1996, p. 93, Ten-femtosecond amplifier creates multiterawatt pulses
Overview of laser components from Walker, B., Yang, Z.-H., Chowdury, E., Dakin, D., Toth, C., Squier, J.A., Fittinghoff, D., Guo, T., Wilson, K., Barty, C. : 1999, International Conference on Multiphoton Processes, (ICOMP) 1999. Ionization of Argon n = 2 (Ar+9 to Ar+16) by a 'Relativistic Field' & New High Average Power Lasers
The following slides are from Walker, B., Toth, C., Squier, J., Fittinghoff, D., Guo, T., Wilson, K., Barty, C. : 1999, Conference on Lasers and Electro-Optics, May 1999 (CLEO). Ultrafast, Relativistic Intensities
1. Prism Oscillator
  - 16 fs duration
  - 100 nm bandwidth
  - nascent pulse to begin
  - 70 m optical path
  - 100’s of optics
2. Strecher
  - Diagram
  - Off-axis, aberration-full
  - cylindrical mirror based
  - 16 fs (5 mm) oscillator pulse
  - 800,000 fs (24 cm) shaped pulse, 10⁵ times stretching
  - CPA to 10^-5 accuracy
  - 90 percent MTQE efficiency
  - Combination of spherical aberrations and angular dispersion allows control of up to 5^th order phase delays, pulse transit time through amplifier becomes frequency independent.
  - Pulse is vertically multiplexed with a roof mirror after the second grating and is sent through the entire system twice.
  - To eliminate transverse spatial effects, the horizontal image of the beam is inverted with a four-mirror image inverter arrangement before the second pass.
3. Regenerative Amplifier
  - Diagram
  - 5 mJ
  - Ti:Sa pumped by 532 nm Nd:YAG laser
  - Spectral shaping pellicle 1.6 mm
  - 5 ´ 10⁸ net pulse energy gain
  - TEM₀₀ mode quality
  - Photo of Thin-Film Polarizer Etalon (TFPE) in lower center
  - Diagram of how TFPE eliminates gain narrowing and controls gain reshaping during amplification
  - pulsed < 10 ns FWHM half-wave Pockels cell (beam switcher)
  - Spectral filter
4. Pre-amplifier
  - 4 pass Ti:Sa
  - 250 mJ, 20 Hz
  - > 40 % efficient
  - high mode quality
5. Final amplifier
  - 2 pass
  - 5.4 J total (about 2.5 J ´ 2), 10 Hz
  - green (Continuum)
  - 54 % conversion efficiency
6. Compressor
  - Chris Barty adjusting pulse-compressor separation. Continuum radiation is generated at the focal point (in air). from Laser Focus World, June 1996, p. 93, Ten-femtosecond amplifier creates multiterawatt pulses0
  - Hybrid vacuum-atmosphere design : Adjustments in air
  - ultraclean, small vacuum
  - negligible group delay error
  - 1998, IEEE Journal of Selected Topics in Quantum Electronics, Vol. 4, 441
7. Final beam profile at 10 Hz
U3 laser image from Laser Focus World, June 1996, p. 93, Ten-femtosecond amplifier creates multiterawatt pulses
C. P. J. Barty, C. L. Gordon III, B. E. Lemoff, C. Rose-Petruck, F. Raksi, Ch. Spielmann, K. R. Wilson, V. V. Yakovlev, and K. Yamakawa Methods for Generation of 10-Hz, 100-TW Optical Pulses

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