A mode-hop-free tunable external-cavity Littrow diode laser with intracavity acousto-optic modulators (AOMs) has been built. The modes of the red laser diode without a special antireflection coating are shifted by varying the injection current. The external resonator modes and the grating selectivity are independently electrically alterable by two AOMs. Thus, a tuning of the external resonator over up to is possible. A precise computer control of laser diode and AOMs allowed a single-mode tuning of the whole laser with a tuning range of in . Additionally, we demonstrated fast tuning over in and a repetition rate of .
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