A laser-based light source, comprising: at least one first arrangement, configured to generate light, comprising: a laser device configured to generate laser light of a predetermined laser wavelength and to emit this laser light as a laser beam; and a light-conversion device configured to convert at least part of the laser light, emitted as the laser beam, into converted light; a second arrangement configured to receive said light from the at least one first arrangement, wherein said light comprises the converted light and a non-converted portion of said laser light, wherein the second arrangement comprises: a means for splitting a portion of the light into a first beam and a second beam, wherein the means comprises: a decoupler configured to receive the light and to output the decoupled portion of the light and an output light; a spectral splitter configured to split the decoupled portion of the light into the first beam and the second beam, wherein said beams have a spectrum, wherein said spectra at least partially do not overlap; a first sensor configured to receive the first beam and to determine a first signal being correlated with the decoupled portion of the light with the same spectrum as said first beam; and a second sensor configured to receive the second beam and to determine a second signal being correlated with the decoupled portion of the light with the same spectrum as said second beam; and a controller configured to: receive the first signal and the second signal, determine a safe-to-operate parameter, based on the first signal and the second signal, wherein the safe-to-operate parameter is a ratio between the first signal and the second signal, and control the operation of the laser-device based on a comparison between the safe-to-operate parameter and at least one predefined threshold. at least one first arrangement, configured to generate light, comprising: a laser device configured to generate laser light of a predetermined laser wavelength and to emit this laser light as a laser beam; and a light-conversion device configured to convert at least part of the laser light, emitted as the laser beam, into converted light; a laser device configured to generate laser light of a predetermined laser wavelength and to emit this laser light as a laser beam; and a light-conversion device configured to convert at least part of the laser light, emitted as the laser beam, into converted light; a second arrangement configured to receive said light from the at least one first arrangement, wherein said light comprises the converted light and a non-converted portion of said laser light, wherein the second arrangement comprises: a means for splitting a portion of the light into a first beam and a second beam, wherein the means comprises: a decoupler configured to receive the light and to output the decoupled portion of the light and an output light; a spectral splitter configured to split the decoupled portion of the light into the first beam and the second beam, wherein said beams have a spectrum, wherein said spectra at least partially do not overlap; a first sensor configured to receive the first beam and to determine a first signal being correlated with the decoupled portion of the light with the same spectrum as said first beam; and a second sensor configured to receive the second beam and to determine a second signal being correlated with the decoupled portion of the light with the same spectrum as said second beam; and a means for splitting a portion of the light into a first beam and a second beam, wherein the means comprises: a decoupler configured to receive the light and to output the decoupled portion of the light and an output light; a spectral splitter configured to split the decoupled portion of the light into the first beam and the second beam, wherein said beams have a spectrum, wherein said spectra at least partially do not overlap; a decoupler configured to receive the light and to output the decoupled portion of the light and an output light; a spectral splitter configured to split the decoupled portion of the light into the first beam and the second beam, wherein said beams have a spectrum, wherein said spectra at least partially do not overlap; a first sensor configured to receive the first beam and to determine a first signal being correlated with the decoupled portion of the light with the same spectrum as said first beam; and a second sensor configured to receive the second beam and to determine a second signal being correlated with the decoupled portion of the light with the same spectrum as said second beam; and a controller configured to: receive the first signal and the second signal, determine a safe-to-operate parameter, based on the first signal and the second signal, wherein the safe-to-operate parameter is a ratio between the first signal and the second signal, and receive the first signal and the second signal, determine a safe-to-operate parameter, based on the first signal and the second signal, wherein the safe-to-operate parameter is a ratio between the first signal and the second signal, and control the operation of the laser-device based on a comparison between the safe-to-operate parameter and at least one predefined threshold.