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Laser4DIY uses a laser with a microchip resonator as the basis. A free-beam diode generates pump radiation with a wavelength of 808 nm, a symmetrical beam divergence of 8°×8° and an emitter size of 200 µm. A GRIN lens (GRAdient-INdex lens) with a focal length of 1.95 mm and an anti-reflective coating for 830 nm on both sides focuses it on a narrow area in the microchip crystal, which increases efficiency.
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