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For example, cavity-enhanced, continuous-wave (CW) Raman excitation has been suggested as a way to coherently and superradiantly populate phonons or charge density waves via material excitons. A steady-state phonon population may be sustained with sufficiently strong electron\u2013phonon coupling to drive a novel collective response. We describe an apparatus built to meet the requirements of such an experimental program: Namely, an ultrahigh-vacuum system housing a length-tunable confocal Fabry\u2013P\u00e9rot cavity with an intracavity sample, both cryogenically cooled and stabilized against vibrations. A four-axis nanopositioner aligns the sample and supports electrical leads intended for future sample carrier density modulation and transport measurements. Transmission through the multimode cavity enables in situ sample imaging for alignment; the sample is a monolayer transition metal dichalcogenide in this work. Operating near the confocal geometry concentrates the optical field into a localized supermode that is expected to substantially enhance light\u2013matter coupling. This enhancement is preserved despite the millimeter-scale cavity length, which provides room for sample alignment and exchange.<\/jats:p>","DOI":"10.1063\/5.0345897","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T12:37:59Z","timestamp":1790685479000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["A cryogenic apparatus for coupling two-dimensional materials to a confocal multimode optical cavity"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4960-3473","authenticated-orcid":false,"given":"Han S.","family":"Hiller","sequence":"first","affiliation":[{"name":"Department of Physics, Stanford University 1 , Stanford, California 94305,","place":["USA"]},{"name":"E. L. 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