The open cavity concept of a VECSEL is often used to incorporate a variety of intracavity elements including: filters, nonlinear crystals, and SESAMs. This leads to expanded device performance over the fundamental chip design and leads to: larger spectral coverage, single frequency operation, short pulse generation, etc. Coupled cavity VECSELs designs where multiple laser cavities can be overlapped in order to allow for even more advanced output characteristics.
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