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Characteristics of spectral shift and spectrum broadening of femtosecond pulses propagation in periodically poled lithium niobate via cascaded quadratic nonlinearity are investigated. Amount of spectral broadening is obtained analytically from coupled equations including Kerr-like term. Multipeak...
We present a model for the simulation of the thermal resistance of flip-chip bonded vertical-external-cavity surface-emitting lasers based on the finite-element method. Therefore, we take on and deepen precedent models with regard to three modifications. Our model for the first time comprises the...