Vermont Photonics Tunable Terahertz Laser

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Description of THz Source

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Principle of Operation

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Principle of Operation

TeraHertz electromagnetic radiation is produced in this free electron laser using an effect first explained by S.J. Smith and E.M. Purcell in 1953. The Smith-Purcell effect describes “Visible Light from Localized Surface Charges Moving Across a Grating”.

This effect occurs over a broad range of spectral wavelengths, including visible through millimeter wavelengths.

The output wavelength is a function of a combination of factors. In the devices operating at Vermont Photonics, a change the electron beam voltage allows continuous tuning of the THz output wavelength from100 to 1000 microns.

This device directly couples free-streaming electrons at the grating into electromagnetic radiation. This promises very high efficiencies as compared to other schemes to produce THz.

This same coupling of free-streaming electrons into electromagnetic radiation is what makes the Klystron so successful at emitting very high power at longer wavelengths for the microwave industry.

FTIR graph

how the terahertz laser works



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Vermont Photonics Technologies Corp.
22 Browne Court, Unit 110
Brattleboro, VT 05301
Phone: (802) 275-5210 • Fax: (802) 275-5215