Abstract: The present invention relates to a pest repelling, killing, and/or damaging UV light-emitting device (100) comprising—a housing (200),—a control element (110) configured to output a control signal (111), and—a UV light-emitting element (115) configured to emit, in response to the control signal (111), far-UVC light (125) thereby repelling, killing, and/or damaging one or more pests, e.g. or in particular mosquitos, irradiated by the emitted far-UVC light (125).

Abstract: An electromagnetic radiation frequency, or equivalent wavelength, converter, the converter including a nonlinear optical component or part having or consisting of a predetermined nonlinear optical material, and a guiding module. The guiding module has a predetermined geometry defining or controlling an effective refractive index of the guiding module, and is configured to receive and guide pump light resulting in a guided pump beam. The nonlinear component or part is bonded with or joined to the guiding module. The bonding is configured to allow at least a part of the guided pump beam to overlap and/or evanescently couple into the nonlinear optical material, and the nonlinear optical component or part is configured to convert the guided pump beam in the nonlinear optical material to an un-guided signal mode radiated as an output light signal at a different frequency or an equivalent wavelength.