ABSTRACT
A new method for describing the Stimulated Brillouin Scattering (SBS) generated in a fiber ring resonator in dynamic regime is presented. Neglecting the time derivatives of the fields amplitudes, our modeling method describes the lasers steady-state operations as well as their transient characteristics or pulsed emission. The developed approach has shown a very good agreement between the theoretical predictions given by the SBS model and the experimental results.
Subject(s)
Algorithms , Fiber Optic Technology/instrumentation , Models, Theoretical , Refractometry/instrumentation , Computer Simulation , Computer-Aided Design , Equipment Design , Equipment Failure Analysis , Light , Scattering, RadiationABSTRACT
Self-Q-switched operation of the all-fiber laser using erbium and samarium fibers in the cavity is realized experimentally. This passively Q-switched all-fiber laser produces very stable pulses with energy of 142 nJ and duration of 450 ns. The experimental results were well reproduced by the results obtained through the numerical integration of a rate-equations model.
Subject(s)
Erbium/chemistry , Fiber Optic Technology/instrumentation , Lasers , Samarium/chemistry , Light , Models, TheoreticalABSTRACT
Subjecting lasers to triangular modulations of the pump produces phenomena that drastically depend on the symmetry of the triangle. For instance, with slow up-rising triangles, a laser below threshold on average may deliver coherent pulses, while it does not deliver coherent pulses with fast up-rising triangles. This effect, which requires the presence of fluctuations in addition to the modulation, is reminiscent of the thermal ratchet with which a directed motion is extracted from a stochastic medium.
ABSTRACT
Direct production of laser output pulses with arbitrary shapes can be extended to the high-frequency domain by use of optimal driving of the pump power. Genetic algorithms allow us to design the optimal time evolutions of the pump power to counteract the detrimental effect of relaxation oscillations. The method is demonstrated on a Nd3+:YVO4 laser and allows us to produce, e.g., triangular pulses at rates 20 times faster than for proportional modulation.
