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There is a growing interest in the use of metal halide perovskites with different compositions as highly efficient light emitters among the whole visible spectral region [1]. Several groups have observed amplified spontaneous (ASE) emission in thin perovskite films. The gain and threshold values for ASE are very promising, motivating the current effort to develop practical devices that lase.
Continuous-wave single-longitudinal-mode (SLM) lasers are an important tool for applications exploiting light-matter interactions. However, mature laser technologies using inversion gain media cover only a limited part of the optical spectrum. Therefore, nonlinear frequency conversion is necessary to reach wavelengths outside this range. Conversion using stimulated Raman scattering can be a simple...
The possibility of single-frequency oscillation of a distributed feedback (DFB) Raman fibre laser at modest pump powers was first predicted in Ref. 1, for a 1-m cavity, where it was shown that very strong intensity build-up of the Raman Stokes is expected near the discrete phase shift of the DFB grating. More recently, Raman DFB fibre laser oscillation has been observed [2, 3, 4] in relatively short...
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