[OPTICAL REVIEW Vol. 19, No. 5 (2012) 332-336]
© 2012 The Japan Society of Applied Physics

On Enhanced Tuning Capabilities of External Cavity Lasers Using Acousto-Optic Modulators

André Bösel1*, Jörg EHLBECK1, Nicole König2, Klaus-Dieter SALEWSKI2, and Jürgen Röpcke1

1Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Straβe 2, 17489 Greifswald, Germany
2Institute of Physics, E.-M.-Arndt-University Greifswald, Felix-Hausdorff-Straβe 6, 17489 Greifswald, Germany

(Received May 31, 2012; Accepted July 10, 2012)

For an enhanced tuning of an external-cavity Littrow diode laser at 670 nm a new approach based on the frequency controlling of intra-cavity acousto-optic modulators (AOM) has been developed and tested. Using a method called “mode shaking” a nearly continuously laser tuning over a frequency range of 186 GHz (0.279 nm) within a time interval of 20 ms has been achieved. A further method called “far laser frequency jump” allows frequency changes of up to 1080 GHz (1.6 nm) between two spectral regions of the diode laser emission range within about 50 μs.

Key words: diode laser, tunable laser, external cavity diode laser, visible laser, acousto-optic device

*E-mail address: andre.boesel@inp-greifswald.de