Matthew C. H. Leung
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View article: Crank-rocker optical fiber mode scrambler prototype for the GMT-Consortium Large Earth Finder (G-CLEF)
Crank-rocker optical fiber mode scrambler prototype for the GMT-Consortium Large Earth Finder (G-CLEF) Open
When coherent light propagates through a multimode optical fiber, the modes interfere at the fiber exit boundary, producing a high-contrast speckle interference pattern called modal noise. This non-uniform interference pattern introduces s…
View article: VIPER: a high-resolution multimode fiber-fed VIPA spectrograph concept for characterizing exoplanet atmospheric escape
VIPER: a high-resolution multimode fiber-fed VIPA spectrograph concept for characterizing exoplanet atmospheric escape Open
An increasing number of applications in exoplanetary science require spectrographs with high resolution and high throughput without the need for a broad spectral range. Examples include the search for biosignatures through the detection of…
View article: Off-axis Hartmann wavefront sensing for the GMT-Consortium Large Earth Finder (G-CLEF) red camera optics
Off-axis Hartmann wavefront sensing for the GMT-Consortium Large Earth Finder (G-CLEF) red camera optics Open
The Hartmann test is a method used to measure the wavefront error in a focal optical system, wherein a mask with a pattern of small holes is placed at the system's aperture stop. By taking an image at a defocused plane, the differences bet…
View article: Accurately Measuring Hyperspectral Imaging Distortion in Grating Spectrographs Using a Clustering Algorithm
Accurately Measuring Hyperspectral Imaging Distortion in Grating Spectrographs Using a Clustering Algorithm Open
Grating-based spectrographs suffer from smile and keystone distortion, which are problematic for hyperspectral data applications. Due to this, spectral lines will appear curved and roughly parabola-shaped. Smile and keystone need to be mea…
View article: Accurately measuring hyperspectral imaging distortion in grating spectrographs using a clustering algorithm
Accurately measuring hyperspectral imaging distortion in grating spectrographs using a clustering algorithm Open
Grating-based spectrographs suffer from smile and keystone distortion, which\nare problematic for hyperspectral data applications. Due to this, spectral\nlines will appear curved and roughly parabola-shaped. Smile and keystone need\nto be …
View article: Optical design and wavelength calibration of a DMD-based multi-object spectrograph
Optical design and wavelength calibration of a DMD-based multi-object spectrograph Open
The multi-object spectrograph (MOS) has been the benchmark for the current\ngeneration of astronomical spectrographs, valued for its ability to acquire the\nspectra of hundreds of objects simultaneously. In the last two decades, the\ndigit…