  There has been a significant advancement in terahertz radiation sources in
the past decade, making milliwatt terahertz power levels accessible in both
continuous-wave and pulsed operation. Such high-power terahertz radiation
sources circumvent the need for cryogenic-cooled terahertz detectors such as
semiconductor bolometers and necessitate the need for new types of calibrated,
room-temperature terahertz detectors. Among various types of room-temperature
terahertz detectors, pyroelectric detectors are one of the most widely used
detectors, which can offer wide dynamic range, broad detection bandwidth, and
high sensitivity levels. In this article, we describe the calibration process
of a commercially available pyroelectric detector (Spectrum Detector, Inc,
SPI-A-65 THz), which incorporates a 5 mm diameter LiTaO3 detector with an
organic terahertz absorber coating.
