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2010</title></head><body>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Seminar on</b></font></div>
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color="#000000"><b>Modern Optics and Spectroscopy</b></font></div>
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color="#000000"><b><br></b></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Investigating exciton correlations in GaAs quantum
wells using COLBERT spectroscop<font
size="+1">y</font></b></font></div>
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color="#000000"><i><b><br></b></i></font></div>
<div align="center"><font face="Times New Roman"
color="#000000"><b>Daniel Turner</b>,</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">MIT</font></div>
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<div align="center"><font face="Times New Roman"
color="#000000">Tuesday, March 9, 2010</font></div>
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<div align="center"><font face="Times New Roman" color="#000000">12:00
- 1:00 p.m.</font></div>
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<div align="center"><font face="Times New Roman"
color="#000000">Multiple-quantum two-dimensional Fourier transform
optical (2D FTOPT) spectroscopy was developed and conducted on GaAs
quantum wells. Spatiotemporal femtosecond pulse shaping was used to
control the optical phases and time delays of ultrashort pulses in
multiple non-collinear beams so that fully coherent four-wave and
higher-order mixing measurements could be conducted without any moving
parts. Coherences of excitons, biexcitons, unbound but correlated
exciton pairs, and triexcitons were observed directly.</font></div>
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<div align="center"><font face="Times New Roman" color="#000000">Grier
Room, MIT Bldg 34-401</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">Refreshments served after the lecture</font></div>
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