Numerical simulation of the fiber optic parametric oscillator aiming the goal to produce picosecond narrowband pulses for CARS has been performed in an extremely wide range of parameters, such as a pump pulse duration, parametric frequency shift, spectral bandwidth of the pump and the parametric pulses. It required extremely large calculation window both in time (3.5 ns) and spectral (from 433 nm to 3100 nm) domains. We managed to speed up simulation in fifty times by graphic processor unit, which allowed to define the areas of stability for different lengths of standard passive and photonic-crystal fibers used in the external linear cavity of oscillator. The cavity length reached a value of 100 meters that was resulted in parametric pulses with the energy up to 40 nJ and peak power up to 1 kW at a wavelength about 800 nm.
CARS is the one of most exciting and actively developed techniques for real-time monitoring of processes occurring in biological tissues. We present a fiber optical parametric oscillator pumped by specially designed MOPA fiber laser to get time-synchronized optical signals with a frequencies difference of 2800-3000 reverse centimeters. We utilize the fourwave mixing effect in a photonic-crystal fiber to build narrowband tunable fiber optical parametric oscillator. A complex optimization of each part of the source has been performed.
This work presents, for the first time, research of new cavity topologies for mode-locked Er-doped fibre lasers. The proposed drop- and B-shaped cavities using dual-fibre optical collimator allow a relatively simple ring cavity with continuously adjustable length. Demonstrated is high-quality nonlinear-polarisation-evolution mode locking in an Erdoped fibre laser based on the new cavity configurations with pulses of several hundred femtosecond duration. Possibility smooth variation of pulse repetition rate allоws to stabilise this rate and apply femtosecond fibre lasers with proposed new cavity topologies in metrological and other fields where high stability of pulse repetition rate is required.
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