The PCA800 from Thorlabs Inc is a Terahertz Photoconductive Antenna that operates at a wavelength of 800 nm. It delivers a THz output power of less than 7 μW and has an average optical pump laser intensity of up to 620 W/cm² incident on the photoconductive gap. This photoconductive antenna has a maximum laser fluence of 6 μJ/cm2 and pulse durations of 100 fs at the antenna surface. It emits a THz beam with a diameter in the range of 100 μm - 300 μm and has a beam divergence of 15 deg.
The PCA800 generates linearly polarised THz radiation and has a beam virtual focal length of 27.9 mm with an average optical pump power below 500 mW. It has a dark resistance above 40 kOhms and supports bias modulation frequency of up to 10 MHz. This photoconductive antenna features an interdigital antenna structure with an active area of 300 μm x 300 μm, dipole length of 21 μm, and gap distance of 5 μm. It has a chip size of 4 mm x 4 mm x 0.65 mm and requires a maximum bias voltage of ± 15 V.
The PCA800 is mounted on a hyper-hemispherical Si lens and supports BNC output connectors. It is available in a package that measures 25.4 mm (D) x 15.8 mm (L) and is ideal for applications such as a terahertz emitter or detector in pulsed-laser, gated, broadband THz measurement systems for time-domain spectroscopy, or as a photomixing emitter or detector in tunable, continuous-wave THz measurement systems.
