TY - RPRT TI - An upgraded frequency-selectable laser source (FLS) calibrator for CMB bandpass characterization AU - Saunders, Lauren J. [Fermilab] (ORCID:0000000163676380) AU - Simon, Sara M. [Fermilab; Chicago U.] (ORCID:0000000192217802) AU - Sutariya, Shreya [Chicago U.] (ORCID:0000000269718809) AU - Russier, Elisa [Chicago U.] (ORCID:0009000532681044) AU - Bhimani, Sanah [Chicago U.] (ORCID:0000000297631663) AU - Healy, Erin [U. Chicago (main)] (ORCID:0000000237574898) AU - McMahon, Jeffrey [Fermilab; Chicago U.; U. Chicago (main); Chicago U., EFI] PY - 2026 UR - https://www.osti.gov/biblio/3409355 ID - 3409355 ER -