Blue channel of the Keck low-resolution imaging spectrometer

James K. McCarthy; Judith G. Cohen; Brad Butcher; John Cromer; Ernest Croner; William R. Douglas Jr.; Richard M. Goeden; Tony Grewal; Barry Lu; Harold L. Petrie; Tianxiang Weng; Bob Weber; Donald G. Koch; J. Michael Rodgers

doi:10.1117/12.316831

9 July 1998 Blue channel of the Keck low-resolution imaging spectrometer

James K. McCarthy, Judith G. Cohen, Brad Butcher, John Cromer, Ernest Croner, William R. Douglas Jr., Richard M. Goeden, Tony Grewal, Barry Lu, Harold L. Petrie, Tianxiang Weng, Bob Weber, Donald G. Koch, J. Michael Rodgers

Author Affiliations +

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316831
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

This paper summarizes the optical, mechanical, electrical, and software design of LRIS-B, the blue channel of the Keck Low Resolution and Imaging Spectrograph. The LRIS-B project will shortly be completing the existing LRIS instrument through the addition of dichroic beamsplitters, grisms to disperse light on the blue channel, broad-band u, B, and V photometric filters, a blue and near-UV transmitting camera lens, and a large format blue-sensitive CCD detector. LRIS-B will also introduce piezoelectric xy-actuation of the CCD detector inside its Dewar, in order to compensate for flexure in the existing instrument; ultimately the red-side CCD detector will be similarly equipped, its PZT xy-stage being independently programmed. The optical design of the LRIS-B camera uses only fused silica and calcium fluoride elements, and includes a decentered meniscus element to compensate for coma introduced by the LRIS off-axis paraboloid collimator. The design of the blue channel grisms have been optimized for maximum blaze efficiency, the highest dispersion grism having a groove density of 1200 gr/mm. Optical elements not in use at any given time will be stowed in carousels externally mounted to the instrument sidewalls. The entire instrument is designed to permit remote operation.

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James K. McCarthy, Judith G. Cohen, Brad Butcher, John Cromer, Ernest Croner, William R. Douglas Jr., Richard M. Goeden, Tony Grewal, Barry Lu, Harold L. Petrie, Tianxiang Weng, Bob Weber, Donald G. Koch, and J. Michael Rodgers "Blue channel of the Keck low-resolution imaging spectrometer", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316831

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