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A photograph of the miniature fiber-optic MPM probe. SMF: single mode fiber; CL: collimating lens; HWP: half-wave plate; QWP: quarter-wave plate; L: lens; PPLN: periodically poled MgO:LiNbO3 crystal; F: filter; MEMS: micro-electro-mechanical scanning mirror; DM: Dichroic mirror; OBJ: objective; MMF: multimode fiber. The Loonie shown has a diameter of 26.5 mm.
