Vertical-external-cavity surface-emitting lasers (VECSELs) have emerged as an attractive single-frequency laser platform for quantum computing and -sensing applications including optical clocks. VECSELs exhibit a unique combination of features including high-power single-frequency operation, excellent beam, and the ability to cover a broad wavelength range from the ultraviolet to visible and to infrared. Here a compact commercial VECSEL platform with sub-Hz linewidth for optical lattice clocks is presented including recent data for Sr and Yb systems.
We review the progress of commercial single-frequency VECSELs for quantum technology applications. VECSELs are ideal laser sources for applications requiring low-noise watt-level single-frequency light with excellent beam quality. In particular, we present features of lasers addressing the need for spectroscopy, laser cooling and trapping for selected atoms and molecules, such as Be, Cd, Sr and Yb. Power scaling abilities in single-frequency operation are also discussed.
We report on the development of high peak-power laser diodes emitting in the 1.5 µm wavelength band. Two design approaches, broad-area laser diodes and tapered laser diodes, are described, both with integrated wavelength locking using distributed Bragg reflector. The peak output power of the broad-area components and tapered components is 6.1 W and 4.6 W, respectively. The output spectra of both component types are narrow with less than 0.3 nm full width at half-maximum, and due to the grating the emission wavelength is resistant to drift caused by temperature changes.
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