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14 May 2010 Wave optical simulation of a spectral narrowed resonator
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Abstract
In many modern applications, there are special requirements on the spectral properties of a laser beam. If a small spectral line width is desired, a spectral narrowing module can be placed inside the resonator to select only a small part of the spectral gain profile. This can be done for example with a compressing unit containing a prism train and a grating reflector in Littrow arrangement. To get a high selectivity, the grating is used in high order. From the point of view of a physical modeling of the laser resonator, the correct consideration of the diffraction effects in the asymmetrical Littrow part is complicated, since there are quite different path lengths across the beam cross section. Here a simple but elegant solution is presented to solve this problem with high precision. With the help of this approach, the complete resonator is modeled in the spatial and spectral domain. This allows a prediction of the spatial output beam profile, the divergence and the spectral distribution of the extracted radiation. It can be seen, that the spectral properties change over the cross section. This is an effect, which is also observed in practice. With this simulation tool, a performance prediction and an optimization of the resonator output radiation is possible.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Gross "Wave optical simulation of a spectral narrowed resonator", Proc. SPIE 7717, Optical Modelling and Design, 77170T (14 May 2010); https://doi.org/10.1117/12.853695
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