抄録
An optical frequency comb (OFC) has attracted attention in optical frequency metrology because the
mode-resolved OFC spectrum can be used as a precise frequency ruler due to both broadband spectrum
and narrow linewidth characteristics. However, other than optical frequency metrology, the application
fields of OFC remain undeveloped. Another interesting aspect of OFC is an optical carrier with a huge
number of discrete frequency channels because OFC is composed of a series of frequency spikes that are
regularly separated by a repetition frequency in the broad spectral range. In this paper, we encode the
line-image of a sample on the mode-resolved OFC spectrum by 1D spectral encoding. The resulting
line-image-encoded OFC spectrum is acquired by a dual-comb spectrometer after passing through a
confocal pinhole. Finally, the line image is decoded from the mode-resolved amplitude spectrum. The
proposed method enables us to establish both confocality and line-field imaging under a scan-less
condition.
