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The Cosmology Large Angular Scale Surveyor (CLASS) is a telescope arrayobserving the Cosmic Microwave Background (CMB) at frequency bands centerednear 40, 90, 150, and 220 GHz. CLASS measures the CMB polarization on thelargest angular scales to constrain the inflationary tensor-to-scalar ratio andthe optical depth due to reionization. To achieve the long time-scale stabilitynecessary for this measurement from the ground, CLASS utilizes a front-end,variable-delay polarization modulator on each telescope. Here we report on theimprovements in stability afforded by front-end modulation using data acrossall four CLASS frequencies. Across one month of modulated linear polarizationdata in 2021, CLASS achieved median knee frequencies of 9.1, 29.1, 20.4, and36.4 mHz for the 40, 90, 150, and 220 GHz observing bands. The knee frequenciesare approximately an order of magnitude lower than achieved via CLASSpair-differencing orthogonal detector pairs without modulation.

Long-Timescale Stability in CMB Observations at Multiple Frequencies using Front-End Polarization Modulation