In this SBIR effort, Los Gatos Research (LGR) proposes to develop, test and deploy three novel compact, rugged and easy-to-use multi-gas analysis instruments, based on tunable diode laser absorption spectrometry and a patented cavity-enhanced laser absorption-based strategy called Off-Axis Integrated Cavity Output Spectroscopy (Off-Axis ICOS), for monitoring and control of extraplanetary regolith processing and oxygen production. The instruments will also prove useful for in situ surface analysis. The first instrument (Instrument #1), based on fast extractive sampling, will record measurements of several important gas-phase constituents in regolith processing facilities with extraordinarily high sensitivity, accuracy and specificity in real time. This instrument will integrate directly into NASA's hydrogen and carbothermal reduction test facilities at Mauna Kea, Hawaii. The measurement quantities of interest include the concentrations of HF, HCl, H2S, O2, H2, CH4, CO, CO2, H2O, and H2O isotopes (H2HO or HDO and H218O). The second instrument (Instrument #2) will provide measurements of H2O concentrations and gas temperature directly in the high temperature reactive flow and prior to hydrolysis. The third instrument (Instrument #3) will provide accurate quantification of the aforementioned gases in a compact, low-power form factor suitable for integration into the Regolith and Environment Science and Oxygen and Lunar Volatile Extraction (RESOLVE) project. This analyzer will be used to study both thermal desorption and hydrogen reduction of extraplanetary regolith.