A six-element polarization-independent transmission trap detector with coaxial input and output beams has been constructed and full characterized. The measured optical parameters are compared with their values, predicted by Fresnel equations. Measured transmittances are in agreement with the predicted values within 2 × 10⁻⁵ in the wavelength region from 450 to 650nm. The spectral responsivity of the transmission trap detector is in agreement with the predicted values within 0.035% at 543.5- and 633.0-nm vacuum wavelengths. The spatial uniformity of the responsivity is ±0.03% across the active area of approximately 5 × 6 mm², measured with a laser beam of 1-mm diameter. The angular uniformity of the transmission trap detector is better than ±0.01% for ±3° rotation around two perpendicular axes.

© 1997 Optical Society of America

[Optical Society of America ]

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