scholarly journals Three key regimes of single pulse generation per round trip of all-normal-dispersion fiber lasers mode-locked with nonlinear polarization rotation

2012 ◽  
Vol 20 (24) ◽  
pp. 27447 ◽  
Author(s):  
Sergey Smirnov ◽  
Sergey Kobtsev ◽  
Sergey Kukarin ◽  
Aleksey Ivanenko
Keyword(s):  
Fiber Lasers ◽  
Single Pulse ◽  
Pulse Generation ◽  
Polarization Rotation ◽  
Round Trip ◽  
Nonlinear Polarization ◽  
Normal Dispersion ◽  
Nonlinear Polarization Rotation

Optimization of a mode-locked fiber laser based on nonlinear polarization rotation using genetic algorithm

2020 ◽  
pp. 20-30
Author(s):  
Дарья Алексеевна Художиткова
Keyword(s):  
Genetic Algorithm ◽  
Fiber Laser ◽  
Hybrid Model ◽  
Fiber Lasers ◽  
Single Pulse ◽  
Scalar Model ◽  
Polarization Rotation ◽  
Nonlinear Polarization ◽  
Nonlinear Polarization Rotation

Выполнено математическое моделирование волоконного лазера с синхронизацией мод на основе эффекта нелинейного вращения поляризации. Проведена оптимизация лазера с использованием генетического алгоритма. В результате были определены параметры лазерного резонатора, при которых достигается наибольшая энергия выходного импульса Purpose. The article addresses optimization of mode-locked fiber laser based on nonlinear polarization rotation. Determination of the resonator parameters corresponding to the single-pulse with the highest energy has been performed using the genetic algorithm. Metodology. Mathematical modelling has been carried out with the help of two models, namely, scalar and hybrid. Scalar model describes signal propagation by generalized nonlinear Schr¨odinger equation. Hybrid model describes section of DCF by pair of generalized nonlinear Schrodinger equations. Numerical simulation has been performed by the split-step Fourier method. Genetic algorithm has been implemented as SteadyState method by GALib library. The value of the fitness function is equal to the energy value for the single-pulse and otherwise zero. Findings. The genetic algorithm has been implemented for solving optimization problem of fiber lasers and modifying the algorithm to reduce the calculation time. The parameters of the laser for the scalar model are determined and agreement with the results obtained by the enumeration method is presented. For the hybrid model, a stable pulse with three times the energy was found. Conclusions. In this work, a determination of the optimal parameters for mode-locked fiber lasers based on nonlinear polarization rotation was presented. The problem was solved using a genetic algorithm. This is the first step towards creating a “smart” self-tuning laser

scholarly journals Q-switched mode locking noise-like pulse generation from a thulium-doped all-fiber laser based on nonlinear polarization rotation

2021 ◽  
pp. 100115
Author(s):  
R. López Estopier ◽  
A. Camarillo Avilés ◽  
M. Bello Jiménez ◽  
O. Pottiez ◽  
M. Durán Sánchez ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Mode Locking ◽  
Pulse Generation ◽  
Polarization Rotation ◽  
Nonlinear Polarization ◽  
Nonlinear Polarization Rotation

scholarly journals The Investigation on Ultrafast Pulse Formation in a Tm–Ho-Codoped Mode-Locking Fiber Oscillator

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3460
Author(s):  
Jingcheng Shang ◽  
Yizhou Liu ◽  
Shengzhi Zhao ◽  
Yuefeng Zhao ◽  
Yuzhi Song ◽  
...  
Keyword(s):  
Maximum Output Power ◽  
Single Pulse ◽  
Mode Locking ◽  
Maximum Output ◽  
Polarization Rotation ◽  
Nonlinear Polarization ◽  
Soliton Pulse ◽  
Proper Design ◽  
Nonlinear Polarization Rotation ◽  
Pulse Formation

We experimentally investigate the formation of various pulses from a thulium–holmium (Tm–Ho)-codoped nonlinear polarization rotation (NPR) mode-locking fiber oscillator. The ultrafast fiber oscillator can simultaneously operate in the noise-like and soliton mode-locking regimes with two different emission wavelengths located around 1947 and 2010 nm, which are believed to be induced from the laser transition of Tm3+ and Ho3+ ions respectively. When the noise-like pulse (NLP) and soliton pulse (SP) co-exist inside the laser oscillator, a maximum output power of 295 mW is achieved with a pulse repetition rate of 19.85-MHz, corresponding to a total single pulse energy of 14.86 nJ. By adjusting the wave plates, the fiber oscillator could also deliver the dual-NLPs or dual-SPs at dual wavelengths, or single NLP and single SP at one wavelength. The highest 61-order harmonic soliton pulse and 33.4-nJ-NLP are also realized respectively with proper design of the fiber cavity.

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