scholarly journals Recent Progress and Development Trend of Self-Sweeping Fiber Laser

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhenzhong Zuo ◽  
Kaile Wang ◽  
Haowei Chen ◽  
Baole Lu ◽  
Jintao Bai
Keyword(s):  
Fiber Laser ◽  
Fiber Lasers ◽  
Recent Progress ◽  
Short Pulse ◽  
Development Trend ◽  
The Self ◽  
Resonator Structure ◽  
Wave Resonator ◽  
Sweeping Effect ◽  
Pulse Characteristics

Since 2011, when Kir’yanov et al. first reported a new wavelength self-sweeping ytterbium-doped fiber laser that does not rely on any tuning element but only on the dynamic induced grating generated in the gain fiber by the standing wave resonator structure, the self-sweeping effect based on fiber waveguides has been extensively studied, leading to great progress in fundamental physics and other applications of self-sweeping fiber lasers. Different doped fiber lasers have not only achieved the self-sweeping effect, but also observed new phenomena such as anomalous self-sweeping and continuous pulses. Due to their remarkable spectral and pulsed characteristics, self-sweeping fiber lasers have been widely used in spectral detection, fiber sensing and short pulse synthesis. In this paper, we will introduce the classification of different doped self-sweeping fiber lasers, summarize their different implementations, and introduce their self-sweeping laws, pulse characteristics, recent progress of applications and future development prospects.

scholarly journals Ultra short pico second chirped pulse generation using SESAM based mode-locked fiber laser

2019 ◽  
Author(s):  
Arpan Dutta
Keyword(s):  
Fiber Laser ◽  
Fiber Lasers ◽  
Short Pulse ◽  
Mode Locking ◽  
Pulse Generation ◽  
Short Pulses ◽  
Chirped Pulse ◽  
Chirped Pulse Amplification ◽  
Pulsed Fiber Laser ◽  
Ultra Short Pulse

Ultra short pulse fiber lasers are widely used in many photonic systems for industrial, biomedical and scientific applications. Popularity of these lasers rapidly developed due to increment in demand of shorter pulses for various applications like communication, ophthalmology, micromachining, medical imaging and precision metrology. Pulsed fiber laser can produce ultra short pulses in order of pico or femto second. Mode locking technique is widely used in rare earth doped fiber lasers to produce such ultra short pulses of light. In this paper, pulsed operation of fiber laser was studied experimentally at 1 micron region. Experiment on pulsed fiber laser has been done using ytterbium (Yb) doped active fiber. Using the principle of passive mode locking, a 2.3 pico-second pulse was produced at 1064nm wavelength. A semiconductor saturable absorber mirror was used to mode lock the laser. The spectral domain data showed that the pulse was not Fourier transform limited which means the pulse was chirped. Chirped pulse amplification systems exploit this pulse characteristic for power scaling of ultra-short pico- second to femto-second pulses.

scholarly journals High Power Linearly Polarized Fiber Lasers in a Linear Cavity

2021 ◽  
Author(s):  
Angie Reda Abdelhay Mohamed Ali Eldamak
Keyword(s):  
Theoretical Model ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Mode Locking ◽  
Gain Medium ◽  
The Self ◽  
Pulse Envelope ◽  
Linear Cavity ◽  
Linearly Polarized

This thesis presents two designs for high power linearly polarized all-fiber linear cavity lasers, continuous wave (CW) and mode-locked. The cavity designs use Polarization Maintaining (PM) fibers for both gain medium and Fiber Bragg Gratings (FBGs). The FBG pairs select lasing wavelength and polarization. The fiber lasers incorporating specialty designed FBGs achieve an extinction ratio larger than 23 dB. Firstly, an all-fiber linear cavity design of a high power picoseconds mode-locked laser is introduced. The proposed configuration is based on Non-Linear Polarization (NPR) using PM Yb-doped active fiber and two matching FBGs to form the laser cavity. The combination of nonlinearity, gain and birefringence in cavity made the laser generate mode-locked pulses in picoseconds range and with high average output power. The output mode-locked pulses amplitude is modulated with an envelope whose mechanism is also investigated in this thesis project. Experimental data and numerical simulations of the self mode-locking fiber laser are presented. Main parameters affecting mode-locked pulses and its envelope are identified. In addition, a new theoretical model based on Nonlinear Schrödinger Equation (NLSE) is developed and implemented on the MATLAB platform. The model explains the self mode-locking mechanism and the source of the pulse envelope. In this model, it is proven that self phase modulation (SPM) plays an essential role in pulse formation and shaping. The theoretical model and experimental results are in a very good agreement at different pumping levels. A method of regulating the mode-locked pulses is presented. This is achieved by applying a pulsed current to pump diode. This method successfully stabilizes the mode-locked pulses underneath a Q-switched pulse envelope. Further scale-up of average power and pulse energy is realized by adding an amplifier stage. Secondly, a CW dual-wavelength all-fiber laser is presented. The laser consists of two pairs of FBGs and a PM Er/Yb co-doped fiber as a gain medium. The laser emits at both 1 μm and 1.5 μm wavelengths simultaneously with a stable output. This laser provides a compact fiber-based pumping source that is suitable for mid-IR generation.

scholarly journals High Power Linearly Polarized Fiber Lasers in a Linear Cavity

2021 ◽  
Author(s):  
Angie Reda Abdelhay Mohamed Ali Eldamak
Keyword(s):  
Theoretical Model ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Mode Locking ◽  
Gain Medium ◽  
The Self ◽  
Pulse Envelope ◽  
Linear Cavity ◽  
Linearly Polarized

This thesis presents two designs for high power linearly polarized all-fiber linear cavity lasers, continuous wave (CW) and mode-locked. The cavity designs use Polarization Maintaining (PM) fibers for both gain medium and Fiber Bragg Gratings (FBGs). The FBG pairs select lasing wavelength and polarization. The fiber lasers incorporating specialty designed FBGs achieve an extinction ratio larger than 23 dB. Firstly, an all-fiber linear cavity design of a high power picoseconds mode-locked laser is introduced. The proposed configuration is based on Non-Linear Polarization (NPR) using PM Yb-doped active fiber and two matching FBGs to form the laser cavity. The combination of nonlinearity, gain and birefringence in cavity made the laser generate mode-locked pulses in picoseconds range and with high average output power. The output mode-locked pulses amplitude is modulated with an envelope whose mechanism is also investigated in this thesis project. Experimental data and numerical simulations of the self mode-locking fiber laser are presented. Main parameters affecting mode-locked pulses and its envelope are identified. In addition, a new theoretical model based on Nonlinear Schrödinger Equation (NLSE) is developed and implemented on the MATLAB platform. The model explains the self mode-locking mechanism and the source of the pulse envelope. In this model, it is proven that self phase modulation (SPM) plays an essential role in pulse formation and shaping. The theoretical model and experimental results are in a very good agreement at different pumping levels. A method of regulating the mode-locked pulses is presented. This is achieved by applying a pulsed current to pump diode. This method successfully stabilizes the mode-locked pulses underneath a Q-switched pulse envelope. Further scale-up of average power and pulse energy is realized by adding an amplifier stage. Secondly, a CW dual-wavelength all-fiber laser is presented. The laser consists of two pairs of FBGs and a PM Er/Yb co-doped fiber as a gain medium. The laser emits at both 1 μm and 1.5 μm wavelengths simultaneously with a stable output. This laser provides a compact fiber-based pumping source that is suitable for mid-IR generation.

Short-pulse gain-switched Raman fiber laser based on conventional silica fibers

2021 ◽  
Vol 141 ◽  
pp. 107154
Author(s):  
Changjun Quan ◽  
Zeqiu Hu ◽  
Duanduan Wu ◽  
Rongping Wang ◽  
Shixun Dai ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Short Pulse ◽  
Raman Fiber Laser ◽  
Silica Fibers

The Effect of Laser Focus Position on Laser Induced Plasma Characteristics

2014 ◽  
Vol 1035 ◽  
pp. 508-513
Author(s):  
Meng Ke Lu ◽  
Shu Rui Zhao ◽  
Kui Wen Guan ◽  
Yan Ling Wang
Keyword(s):  
Short Pulse ◽  
Detection System ◽  
Spectral Lines ◽  
The Self ◽  
Focus Position ◽  
Laser Induced Plasma ◽  
Photoelectric Detection ◽  
Complex Process ◽  
Laser Focus ◽  
Plasma Characteristics

Laser induced plasma is a relatively complex process which is closely related to many factors. In this paper, using a short pulse Nd:YAG laser and CCD photoelectric detection system, the variation of laser focus position effected by spectral intensity, the ratio of signal to background as well as the self-absorption of the plasma spectral lines with the standard spectra sample of aluminum for analysis samples was studied. Results show that: when the laser focus position is about 5mm under the surface of the sample, the relative intensity and the ratio of signal to background of the spectral lines are the strongest, and the spectral lines are sharp without obvious self-absorption.

scholarly journals Development of fiber laser optic system for laser polishing of parts

2016 ◽  
Vol 1 (9) ◽  
pp. 16-23 ◽  
Author(s):  
Александр Савкин ◽  
Aleksandr Savkin ◽  
Владислав Фунтиков ◽  
Vladislav Funtikov ◽  
Александр Григорьянц ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Sample Surface ◽  
Optic System ◽  
Laser Polishing ◽  
Approximate Description ◽  
Laser Head ◽  
Laser Optic

The possibility of an approximate description of a multimode beam of a fiber laser in the Zemax modeling system for the development of an optic system of a laser head is shown. There are developed and manufactured optic units of a laser head taking into account characteristic peculiarities of radiation of high-power fiber lasers. The possibilities are shown the developed optic system in the technology of laser polishing by the remelting of a sample surface made of stainless steel of type 1540-00.

MoS2-wrapped microfiber-based multi-wavelength soliton fiber laser

2017 ◽  
Vol 31 (32) ◽  
pp. 1750303 ◽  
Author(s):  
Feifei Lu
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Optical Communications ◽  
Fiber Lasers ◽  
Tunable Filter ◽  
Linear Birefringence ◽  
Erbium Doped ◽  
Potential Applications ◽  
Multi Wavelength

The single-, dual- and triple-wavelength passively mode-locked erbium-doped fiber lasers are demonstrated with MoS2 and polarization-dependent isolator (PD-ISO). The saturable absorber is fabricated by wrapping an MoS2 around a microfiber. The intracavity PD-ISO acts as a wavelength-tunable filter with a polarization controller (PC) by adjusting the linear birefringence. Single-wavelength mode-locked fiber laser can self-start with suitable pump power. With appropriate PC state, dual- and triple-wavelength operations can be observed when gains at different wavelengths reach a balance. It is noteworthy that dual-wavelength pulses exhibiting peak and dip sidebands, respectively, are demonstrated in the experiment. The proposed simple and multi-wavelength all-fiber conventional soliton lasers could possess potential applications in numerous fields, such as sensors, THz generations and optical communications.

Q-switched all-fiber laser with short pulse duration based on tungsten diselenide

Laser Physics ◽  
2018 ◽  
Vol 28 (5) ◽  
pp. 055104 ◽  
Author(s):  
Wenyi Li ◽  
Yuyi OuYang ◽  
Guoli Ma ◽  
Mengli Liu ◽  
Wenjun Liu
Keyword(s):  
Fiber Laser ◽  
Pulse Duration ◽  
Short Pulse ◽  
Tungsten Diselenide ◽  
Short Pulse Duration

Recent progress of key technologies for spectral beam combining of fiber laser with dual-gratings configuration(Invited)

2018 ◽  
Vol 47 (1) ◽  
pp. 103002
Author(s):  
马毅 Ma Yi ◽  
颜宏 Yan Hong ◽  
孙殷宏 Sun Yinhong ◽  
彭万敬 Peng Wanjing ◽  
李建民 Li Jianmin ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Recent Progress ◽  
Beam Combining ◽  
Key Technologies ◽  
Spectral Beam Combining
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