Pei-fu Gu

Freeform LED lens for uniform illumination.

Xu Liu, Yi Ding, X. Liu, 2008, Optics express.

Infrared optical absorption loss of antireflection coatings on germanium and potassium chloride substrates at the 10-µm wavelength by the photothermal deflection technique.

Xu Liu, Pei-fu Gu, Geogy Atanassov, 1993, Applied optics.