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Efficiency of Dichroics and Polarisation optics

This appendix presents laboratory measurements of the transmission properties of the five main ISIS dichroics, and measurements made using the comparison lamps on the spectrograph, of the efficiency of two reddest dichroics in both transmission and reflection. The final panel of this appendix shows the throughput of the polarization optics (half- and quarter-wave plates and the Savart plate) measured with the comparison lamps.

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