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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.73: Poster
Montag, 12. März 2018, 17:30–19:30, Poster B
Active frequency stabilization of frequency doubled AlGaInP-VECSELs — •Hoy-My Phung1, Roman Bek1, Hermann Kahle1, Michael Böhm2, Kevin Schmidt2, Oliver Sawodny2, Michael Jetter1, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, research centers IQST and SCoPE, Universität Stuttgart, Allmandring 3 — 2Institut für Systemdynamik, Universität Stuttgart, Waldburgstr. 17/19
In recent years, vertical external-cavity surface-emitting lasers (VECSELs) based on the material system AlGaInP have shown outstanding performance for high continuous-wave output power and excellent beam quality in the red spectral range. Furthermore, second harmonic generation to the ultraviolet spectral range enables new applications for AlGaInP-VECSELs such as UV spectroscopy or interference lithography. To achieve laser emission in the ultraviolet spectral range we insert a beta barium borate (BBO) crystal in a v-shaped cavity. A birefringent filter and an etalon are used for tunable single-frequency operation. However, the linewidth of non-stabilized lasers or short-term stability is often not sufficient for the above-mentioned applications and many precision measurements. Based on the side-of-fringe locking technique, we develop a control system to actively stabilize the frequency of the laser. The fundamental frequency is locked to a reference Fabry-Pérot cavity. The position of the flat end mirror is controlled by a piezo actuator in order to compensate for disturbances due to mechanical vibrations. These are measured by acceleration sensors and characterized by amplitude and frequency.