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In the terahertz (THz) spectral range, dual\u2010comb techniques provide a powerful tool for high\u2010resolution and rapid spectroscopy. Quantum cascade lasers (QCLs), owing to their compact footprint and favorable size, weight, and power (SWaP), have emerged as promising sources for THz dual\u2010comb systems. In QCL frequency combs, the repetition frequency generated through intrinsic four\u2010wave mixing is typically equal to the cavity round\u2010trip frequency, corresponding to the fundamental comb. Although this repetition frequency can be tuned via current and temperature control, the accessible tuning range remains limited. Recently, harmonic frequency combs, whose repetition frequencies are integer multiples of the cavity round\u2010trip frequency, have attracted increasing attention, offering enhanced single\u2010line signal\u2010to\u2010noise ratios and providing direct insight into the strong nonlinearity of QCLs. Here, we demonstrate a reconfigurable multi\u2010harmonic dual\u2010comb system realized on a single self\u2010detected THz QCL platform. By precisely controlling the driving current and thermal conditions, we achieve and switch between multiple dual\u2010comb configurations, including fundamental\u2013fundamental, fundamental\u2013second\u2010harmonic, second\u2010harmonic\u2013second\u2010harmonic, and second\u2010harmonic\u2013third\u2010harmonic dual\u2010combs. These results establish harmonic order as an additional degree of freedom for dual\u2010comb operation within a single laser system. The demonstrated platform enables high\u2010resolution and high\u2010sensitivity measurements while significantly simplifying the system architecture. More importantly, it reveals the pronounced intrinsic nonlinearity of THz QCLs, allowing dual\u2010comb generation even with weak spectral overlap. This reconfigurable multi\u2010band dual\u2010comb approach based on a single QCL opens new opportunities for compact THz spectroscopy and frequency metrology.<\/jats:p>","DOI":"10.1002\/nap2.70281","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T12:02:03Z","timestamp":1788350523000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reconfigurable Terahertz Multi\u2010Harmonic Dual\u2010Combs"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6459-5221","authenticated-orcid":false,"given":"Xuhong","family":"Ma","sequence":"first","affiliation":[{"name":"National Key Laboratory of Materials for Integrated Circuits and Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences  Shanghai China"},{"name":"Chongqing Key Laboratory of Precision Optics Chongqing Institute 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