title: Active hyperspectral imaging using a quantum cascade laser (QCL) array and digital-pixel focal plane array (DFPA) camera.
abstract: We demonstrate active hyperspectral imaging using a quantum-cascade laser (QCL) array as the illumination source and a digital-pixel focal-plane-array (DFPA) camera as the receiver. The multi-wavelength QCL array used in this work comprises 15 individually addressable QCLs in which the beams from all lasers are spatially overlapped using wavelength beam combining (WBC). The DFPA camera was configured to integrate the laser light reflected from the sample and to perform on-chip subtraction of the passive thermal background. A 27-frame hyperspectral image was acquired of a liquid contaminant on a diffuse gold surface at a range of 5 meters. The measured spectral reflectance closely matches the calculated reflectance. Furthermore, the high-speed capabilities of the system were demonstrated by capturing differential reflectance images of sand and KClO3particles that were moving at speeds of up to 10 m/s.
authors: Anish
authors: A
authors: Goyal
authors: Travis
authors: T
authors: Myers
authors: Christine A
authors: CA
authors: Wang
authors: Michael
authors: M
authors: Kelly
authors: Brian
authors: B
authors: Tyrrell
authors: B
authors: B
authors: Gokden
authors: Antonio
authors: A
authors: Sanchez
authors: George
authors: G
authors: Turner
authors: Federico
authors: F
authors: Capasso