We have designed and built a pyroelectric optical detector for use as a transfer standard for the calibration of optical power meters. The pyroelectric element is made from lithium tanta-late (LiTaO<sub>3</sub>). Gold black is used as the optical absorber in a multiple reflection wedge-shaped trap structure, with a 5-mm diameter input aperture and an f/4 field-of-view. The detector’s spatial responsivity varies less than 1%. The responsivity as a function of wavelength varies less than 1% over a range from 0.45–1.55 µm and less than 4% from 1.55–10.6 µm. The measured noise equivalent power (NEP) is 5×10<sup>-8</sup> W/Hz<sup>½</sup> . For this wavelength range and detector area, the measured NEP and spatial uniformity represents a significant improvement over comparable predecessors.
© 1997 Optical Society of America
J.H. Lehman, "Pyroelectric Trap Detector for Spectral Responsivity Measurements," Appl. Opt. 36, 9117-9118 (1997)