KEYWORDS: Neodymium, Random lasers, Picosecond phenomena, Beam path, Near infrared, Absorption, Spontaneous emission, Solid state physics, Solid state lasers, Absorbance
This work presents an accurate experimental comparison among the spectro-temporal performances of near infrared and visible emitting solid state random lasers under ultrafast pumping. The near infrared random lasers are based on stoichiometric Nd crystal powders whereas the visible random laser is a ground powder of a hybrid compound based on Rhodamine B incorporated into a di-ureasil host. We demonstrate that despite the different nature of the base materials, the spectro-temporal dynamics of both kind of systems can be described by a rate-equations model based on the photon paths in an amplifying medium with an exponential probability distribution.
The problem of light collection in random lasers (RLs) is addressed. As the radiation emitted by this system is Lambertian due to its spatial incoherence, a device based on an ellipsoidal revolution mirror is designed, developed, and tested in order to optimize the harvesting of the radiation emitted by the RL. The system provides a simple injection procedure of the emitted energy at the entrance of a multimode optical fiber. The results obtained show that the device has a net energy efficiency of 35%, close to the theoretically expected one.
This work presents a comparative study of the random lasing performance of several Nd-based stoichiometric compounds, including threshold and absolute slope efficiencies together with a discussion about the fundamental parameters which control the random laser operation in this kind of compounds.
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