Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.3: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Noise cancelling in solid-state lasers — •Thomas Konrad1, Tobias Steinle1, Roman Bek2, Michael Scharwaechter2, Matthias Seibold2, Andy Steinmann1, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart — 2Twenty-One Semiconductors GmbH, Allmandring 3, 70569 Stuttgart
Fast and precise measurements are key for many challenging laser applications, such as biological and biomedical imaging. The precision is limited by the noise of the systems we use. Once the measurement precision reaches the laser noise level, the measurement time must be increased quadratically for further improvement. Especially with biological samples, a significant longer measurement time can alter the specimen and/or results. Therefore, exploiting the optimum noise characteristic of the driving source is superior to increasing measurement time.
In this work, we investigate noise reduction of a solid-state laser in the spectroscopically relevant 1 kHz - 10 MHz frequency range. Our approach is to reduce the noise in the oscillator itself instead of using a subsequent noise eater. It is the laser resonator that couples the lasers characteristic properties such as output power, optical spectrum, pulse duration, and therefore, consistent noise reduction of all properties must take place within the resonator itself. To reduce the noise, we use a second high-speed gain medium in the cavity whose pump is controlled by a PID feedback loop.
Keywords: solid-state laser; laser noise