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We have constructed and tested a sensitive LiTaO3 pyroelectric detector with a measured NEP of 1.3×10−10 W/(Hz)1/2, which is in good agreement with the theoretical value. LiTaO3 has the advantages of being nonhygroscopic, relatively insensitive to ambient temperature, and has sufficient mechanical strength to polish to 10-μ-thick samples. We show that no one figure of merit is sufficient for evaluating pyroelectric materials for use in low NEP detectors.

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