We report advances in the development of THz quantum-cascade metasurface VECSELs intended for use as local oscillators in terahertz heterodyne receiver instruments for astrophysical investigation of the interstellar medium. First, by using a patch-based amplifying metasurface we obtain QC-VECSEL lasing with milliwatt output power at 4.6 THz with reduced power consumption less than 1 W. Second, we report the phase locking of a QC-VECSEL at 3.4 THz to a microwave reference using a Schottky diode mixer. Finally, we report efforts and challenges to scale down the lasing frequency of the VECSELs to 1.9 THz.
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