A Laser-Induced Breakdown Spectroscopy (LIBS) system to detect a constituent element of interest within a sample having a target spectral feature, said LIBS system comprising: - a pulsed laser source generating light pulses apt to create a plasma upon irradiating said sample; - an element detection assembly comprising a high-resolution spectrometer having a narrowband spectral range covering the spectral feature of the constituent element of interest and a resolution sufficient to distinguish the spectral feature of the constituent element of interest; - a broadband detection assembly comprising a low-resolution spectrometer having a broadband spectral range; - a probe head transportable by a user to a sample site and having a probing interface configured to irradiate the sample with the light pulses and collect resulting plasma light; - probe optics optically coupling the probing interface with the pulsed laser source, the low-resolution spectrometer and the high-resolution spectrometer, the probe optics comprising a dichroic notch filter or a bandpass filter for: directing a narrowband spectral portion of the plasma light encompassing said spectral feature of the constituent element of interest to the high-resolution spectrometer on a first output light path; and directing a broadband spectral portion of said plasma light to the low-resolution spectrometer on a second output light path, wherein a dichroic notch filter reflects the narrowband spectral portion and transmits the broadband spectral portion and a bandpass filter transmits the narrowband spectral portion and reflects the broadband spectral portion. - a pulsed laser source generating light pulses apt to create a plasma upon irradiating said sample; - an element detection assembly comprising a high-resolution spectrometer having a narrowband spectral range covering the spectral feature of the constituent element of interest and a resolution sufficient to distinguish the spectral feature of the constituent element of interest; - a broadband detection assembly comprising a low-resolution spectrometer having a broadband spectral range; - a probe head transportable by a user to a sample site and having a probing interface configured to irradiate the sample with the light pulses and collect resulting plasma light; - probe optics optically coupling the probing interface with the pulsed laser source, the low-resolution spectrometer and the high-resolution spectrometer, the probe optics comprising a dichroic notch filter or a bandpass filter for: directing a narrowband spectral portion of the plasma light encompassing said spectral feature of the constituent element of interest to the high-resolution spectrometer on a first output light path; and directing a broadband spectral portion of said plasma light to the low-resolution spectrometer on a second output light path, directing a narrowband spectral portion of the plasma light encompassing said spectral feature of the constituent element of interest to the high-resolution spectrometer on a first output light path; and directing a broadband spectral portion of said plasma light to the low-resolution spectrometer on a second output light path,