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Spectroscopy is the basic tool for studying molecular physics and realizingbio-chemical sensing. However, it is challenging to realize sub-femtometerresolution spectroscopy over broad bandwidth. In this paper, broadband andhigh-resolution spectroscopy with calibrated optical frequency is demonstratedby bridging the fields of speckle patterns and electro-optic frequency comb(EOFC). A novel wavemeter based on whispering-gallery-mode (WGM) speckles (orWGM barcodes) is proposed to link the frequency of a tunable continuous-wave(CW) laser to an optical reference provided by an ultra-stable laser. Theultra-fine comb lines generated from the CW laser sample the spectrum withsub-femtometer resolution. Measurement bandwidth is far extended by performingsequential acquisitions, since the centre optical frequency of EOFC isabsolutely determined by WGM speckle-based wavemter. This approach fullyutilizes the advantages of two fields to realize 0.8-fm resolution with a fiberlaser and 80-nm bandwidth with an external cavity diode laser. Thespectroscopic measurements of an ultrahigh-Q cavity and the HCN gas absorptionis demonstrated, which shows the potentials of this compact system with highresolution and broad bandwidth for more applications.

Whispering-gallery-mode barcode-based broadband sub-femtometer-resolution spectroscopy with an electro-optic frequency comb