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External cavity diode laser

Patent Granted External-cavity diode lasers are tunable lasers which use mainly double heterostructures diodes of the AlxGa(1-x)As type. The first external-cavity diode lasers used intracavity etalons[5] and simple tuning Littrow gratings.[6] Other designs include gratings in grazing-incidence configuration and multiple-prism grating configurations.

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