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In this work, Ridge Waveguide Amplifiers (RWA) with a gain wavelength around 1122nm and different device geometries are analyzed in detail using electro-optical measurements. The measurement results are compared with simulations based on a beam propagation approach to evaluate them and gain a better understanding of the device behavior. Optimized operating conditions are derived with respect to the electro-optical and amplification efficiency of the amplifier. The potential of RWAs with a combination of diffraction-limited beam quality and high output power is demonstrated in miniaturized laser modules supplied with polarization-maintaining optical fibers for input and output and optional nonlinear crystals. More than 200mW of yellow-green laser light with a wavelength of 561nm is provided through the fiber, enabling applications in the bio-medical field.
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Nils Werner, Marie Triebkorn, Arnim Ginolas, Sabrina Kreutzmann, Philipp Hildenstein, Katrin Paschke, Günther Tränkle, "Efficiency optimization of ridge waveguide amplifiers at 1122 nm," Proc. SPIE 12440, Novel In-Plane Semiconductor Lasers XXII, 124400O (15 March 2023); https://doi.org/10.1117/12.2649631