That's why Goddard engineer Dr. Berhanu Bulcha has been working on a type of instrument called a heterodyne spectrometer that could zoom in on particular frequencies to definitively identify and locate water sources on the Moon. To function however, it would need a stable, high-powered, terahertz laser, which was prototyped in collaboration with Longwave Photonics through NASA's Small Business Innovation Research (SBIR) program.'This laser allows us to open a new window to study this frequency spectrum,' Bulcha said.

https://interestingengineering.com/science/quarter-sized-lasers-search-water-on-mars

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