Scientists at ETH Zurich, Switzerland, have devised a way to generate a highly stable pair of offset frequency combs from a single, compact, free-running semiconductor disk laser (Science, doi: 10.1126/science.aam7424). The team’s setup uses a birefringent crystal within the laser cavity to split the beam—with the frequency comb offset tunable simply by varying the crystal thickness. The approach, according to the team, “drastically reduces the complexity for dual-comb spectroscopy,” and could make that emerging technique practical for a wider range of industrial settings and applications.
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