Free electron lasers (FELs) are unique sources for tunable and coherent light pulses. Particularly in the far-infrared spectral range (20-100 µm), they provide intense and ultrashort pulses that cannot be obtained by any other means, making unique low-energy spectroscopy experiments possible. We have a dedicated user room atthe Stanford Free-Electron Laser Center, where we can perform various two-color, time-resolved experiments utilizing a synchronized Ti:Sapphire-FEL system in conjunction with a 9 Tesla superconducting magnet.
Figure 1: Time-resolved cyclotron resonance in InSb/AlInSb multiple quantum wells. Pump wavelength = 800 nm, probe wavelength = 42 microns.
Time-resolved FIR spectroscopy of InSb, InGaMnAs.
Time-resolved cyclotron resonance.
THz sideband generation.
References:
G. A. Khodaparast, D. C. Larrabee, J. Kono, D. S. King, S. J. Chung, and M. B. Santos, “Relaxation of quasi-2D electrons in a quantizing magnetic field probed by time-resolved cyclotron resonance,” Physical Review B 67, 035307 (2003). (abstract, full text)
G. A. Khodaparast, D. C. Larrabee, J. Kono, D. S. King, J. Kato, T. Slupinski, A. Oiwa, H. Munekata, G. D. Sanders, and C. J. Stanton, “Terahertz dynamics of photo-generated carriers in ferromagnetic InGaMnAs,”Journal of Applied Physics 93 (2003), pp. 8286-8288. (abstract, full text)
J. Kono, ” Ultrafast and nonlinear spectroscopy of solids with small energy photons” (invited paper), Japanese Journal of Applied Physics 41 (2002), Suppl. 41-1, pp. 76-87. (full text)
M. A. Zudov, A. P. Mitchell, A. H. Chin, and J. Kono, “Terahertz magneto-spectroscopy of transient plasmas in semiconductors,” Journal of Applied Physics 94, 3271 (2003). (abstract, full text)
M. A. Zudov, J. Kono, A. P. Mitchell, and A. H. Chin, “Time-resolved, nonperturbative, and off-resonance generation of optical terahertz sidebands from bulk GaAs,” Physical Review B – Rapid Communications 64(2001), 121204(R). (abstract, full text)
J. Kono, A. H. Chin, A. P. Mitchell, T. Takahashi, and H. Akiyama, “Picosecond time-resolved cyclotron resonance in semiconductors,” Applied Physics Letters 75 (1999), pp. 1119-1121. (abstract, full text)
Collaborators:
Chris Stanton, University of Florida
Mike Santos, University of Oklahoma
