Regensburg 2004 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 36: Nonlinear Dynamics and Chaos II
DY 36.5: Vortrag
Mittwoch, 10. März 2004, 17:30–17:45, H2
Rejection of the output power noise in a multimode solid state laser by pure electronic feedback — •L. Ehlkes1,2, T. Letz1,2, K. Pyragas3, and A. Kittel1 — 1Energy and Semiconductor Research Group, Department of Physics, University of Oldenburg — 2Max Planck Institute for the Physics of Complex Systems, Dresden — 3Semiconductor Physics Institute, Vilnius, Lithuania
Intracavity frequency doubled solid state laser that emit light in the visible spectral range have great potential for technical applications. The display technology sector is one example where this powerful green and blue light sources are necessary at a low price and compact design. The optical nonlinear crystal responsible for the frequency conversion is placed inside the laser cavity in order to maximize efficiency. The drawback of a simple, low cost setup is a fluctuating output power known as the green problem.
In order to stabilize the output intensity of a frequency-doubled Nd:YAG- laser we use a pure electronic proportional feedback loop. The infrared intensities of two orthogonal directions of polarization are used to determine corrections which alter the currents through two orthogonal polarized pump diodes. The method seems promising for technical application.