LIBS is recognized as a powerful tool for qualitative elemental, molecular, and isotopic analysis of materials. LIBS uses short, powerful pulses to initiate dielectric breakdowns in solids, liquids, and gases and produces a bright flash of light at wavelengths that are characteristic of the elements present in the target. When this light is analyzed by a spectrometer, the identities of the elements present can be estimated and sometimes quantified. The light generated by the LIBS pulse must be returned through a fiber optic cable to a spectrometer. That requires a set of at least four mirrors, two of which need to be dichroic mirrors produced through an extensive chemical vapor deposition process. This invention avoids the need for two mirrors, reducing the complexity and cost of the laser head and maximizing the amount and quality of light returned for analysis.