From Event: SPIE Optical Engineering + Applications, 2017
Based on the experience from Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST, we have moved to the flight instrument design phase. The flight instrument is similar to PISCES, but there are important changes to its design as our requirements have evolved. Beginning with the science and system requirements, we discuss a number of critical trade-offs. Most significantly there are trades in the type of IFS, lenslet array shape and layout, detector sampling, and accommodating the larger Field Of View (FOV) and wider wavelength band for a potential Starshade. Finally, the traditional geometric optical design is also investigated and traded. We compare a reflective versus refractive design, and the telecentricity of the relay. The relay before the lenslet array controls the chief angle distribution on the lenslet array. Our previous paper1 has addressed how the relay design combined with lenslet array/pinhole mask can further suppress the residual star light and increase the contrast. Highlighting all of these design trades, we present the phase A IFS optical design for the WFIRST coronagraph instrument.
Qian Gong, Tyler Groff, Avi Mandell, Michael McElwain, Maxime Rizzo, and Prabal Saxena, "Flight Integral Field Spectrograph (IFS) optical design for WFIRST coronagraphic exoplanet demonstration (Conference Presentation)," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000A (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2273064.5581309801001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon