Astronomical Infrared Spectrometer.

An echelle spectrometer-spectrograph for astronomical use.

A compact echelle spectrometer-spectrograph has been designed for use at the Cassegrain focus of the University of Wisconsin 91-cm telescope at Pine Bluff. Laboratory results obtained with this instrument show that it has great potential for both stellar and nebular studies. Typical photographs and photoelectric scans of laboratory spectra are shown. A method of determining the profile of the e...

Photonic bandgap infrared spectrometer.

We propose and demonstrate an infrared (IR) absorption spectrometer, made with a spatially variable photonic bandgap (PBG) structure, a blackbody source, and a simple IR detector, to identify the IR molecular fingerprints of analyte molecules. The PBG-based structure consists of thermally evaporated, IR transparent, high-refractive-index chalcogenide quarter-wave stacks (QWS) with a cavity laye...

Apochromatic lenses for near-infrared astronomical instruments

Deqing Ren Jeremy R. Allington-Smith University of Durham Department of Physics Durham DH1 3LE United Kingdom E-mail: [email protected] Abstract. A method based on the Herzberger approach has been investigated for the selection of glasses for the apochromatic correction at near-infrared (NIR) wavelength. The method avoids the algebraic complexity and simplifies the glass selection process...

An infrared upconverter for astronomical imaging

Longwave infrared (LWIR) coded aperture dispersive spectrometer.

We describe a static aperture-coded, dispersive longwave infrared (LWIR) spectrometer that uses a microbolometer array at the detector plane. The two-dimensional aperture code is based on a row-doubled Hadamard mask with transmissive and opaque openings. The independent column code nature of the matrix makes for a mathematically well-defined pattern that spatially and spectrally maps the source...