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Laser Produces T-Ray Diffractive Elements

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Laser Produces T-Ray Diffractive Elements To ease the integration of components for terahertz spectroscopy and signal processing, a team at Massachusetts Institute of Technology in Cambridge has fabricated integrated diffractive elements in LiNbO3 using femtosecond pulses from an amplified Ti:sapphire laser. The group reported the work in the Feb. 3 issue of Applied Physics Letters.

In a demonstration of the technique, the researchers produced grating structures in bulk crystal comprising a series of 0.14-mm-wide grooves separated by 0.2 mm. The laser in the experiment was a homebuilt Ti:sapphire with a repetition rate of 1 kHz and pulse energies of 100 µJ. "Movies" of their studies of phonon-polariton waves traveling through the structures will be available soon at nelson.mit.edu.
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Published: April 2003
amplified Ti:sapphire laserLiNbO3MITResearch & Technologysignal processingspectroscopyterahertz spectroscopyLasers

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