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Multiple-prism grating laser oscillator
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<p>Multiple-prism grating laser oscillators, or MPG laser oscillators, use <a href="/facts/Beam_expander/lpwqjIRz">multiple-prism beam expansion</a> to illuminate a <a href="/facts/Diffraction_grating/TUcyt7Do">diffraction grating</a> mounted either in Littrow configuration or grazing-incidence configuration. Originally, these narrow-linewidth tunable dispersive oscillators were introduced as multiple-prism Littrow (MPL) grating oscillators, or hybrid multiple-prism near-grazing-incidence (HMPGI) grating <a href="/facts/Optical_cavity/BITPG3ga">cavities</a>, in organic <a href="/facts/Dye_laser/IRw09pbC">dye lasers</a>. However, these designs were quickly adopted for other types of lasers such as <a href="/facts/Gas_laser/1eIYl75j">gas lasers</a>, <a href="/facts/Diode_laser/TjHzJteV">diode lasers</a>, and more recently <a href="/facts/Fiber_laser/JrNSrAyY">fiber lasers</a>. </p>