Intense THz source based on BNA organic crystal pumped at Ti:Sapphire wavelength

TL;DR

This paper demonstrates a high-energy terahertz source using organic BNA crystal pumped by a Ti:Sapphire laser, achieving efficient optical rectification with broad frequency coverage.

Contribution

It introduces a simple, efficient method for generating intense THz pulses via optical rectification in BNA crystal pumped at 800 nm.

Findings

Achieved 0.25% conversion efficiency

Generated THz radiation between 0.2 and 3 THz

Analyzed damage threshold and efficiency dependencies

Abstract

We report on high energy terahertz pulses by optical rectification (OR) in the organic crystal N-benzyl-2-methyl-4-nitroaniline (BNA) directly pumped by a conventional Ti:Sapphire (Ti:Sa) amplifier. The simple scheme provides an optical to terahertz conversion efficiency of 0.25% when pumped by a collimated laser pulses with duration of 50 fs and central wavelength of 800nm. The generated radiation spans frequencies between 0.2 and 3 THz. We measured the damage threshold as well as the dependency of the conversion efficiency on the pump fluence, pump wavelength, and pulse duration.