AI Article Synopsis
- A new method for generating high peak power terahertz radiation using ultra-short pulse lasers has been developed.
- A titanium:sapphire laser is used to create a long pulse, which is then modulated at terahertz frequencies through a spatial filtering technique.
- This system achieves peak powers of at least 1.5 kW in a gallium selenide crystal, with the potential to reach 150 kW, and allows tuning between 0.7 and 2.0 THz.
Article Abstract
A new way of generating high peak power terahertz radiation using ultra-short pulse lasers is demonstrated. The optical pulse from a titanium:sapphire laser system is stretched and modulated using a spatial filtering technique to produce a several picosecond long pulse modulated at the terahertz frequency. A collinear type II phase matched interaction is realized via angle tuning in a gallium selenide crystal. Peak powers of at least 1.5 kW are produced in a 5 mm thick crystal, and tunability is demonstrated between 0.7 and 2.0 THz. Simulations predict that 150 kW of peak power can be produced in a 5 mm thick crystal. The technique also allows for control of the terahertz bandwidth.
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| http://dx.doi.org/10.1364/oe.14.006813 | DOI Listing |
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