scholarly journals A Passively Q-Switched Holmium-Doped Fiber Laser with Graphene Oxide at 2058 nm

2021 ◽  
Vol 11 (1) ◽  
pp. 407
Author(s):  
Jinho Lee ◽  
Ju Han Lee
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Fiber Laser ◽  
Ring Resonator ◽  
Continuous Wave ◽  
Optical Power ◽  
Polished Surface ◽  
Fiber Ring ◽  
Q Switching ◽  
Side Polished Fiber

This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A continuous-wave thulium-doped all-fiber laser, which was configured with a master-oscillator power-amplifier (MOPA) structure, was constructed as a pumping source. By inserting the fabricated SA into an all-fiber ring resonator based on 1-m length of Ho-doped fiber, Q-switched pulses could readily be obtained at a wavelength of 2058 nm. The pulse width was observed to vary from 2.01 to 1.56 μs as the pump power was adjusted from ~759 to 1072 mW, while the repetition rate was tunable from 45.56 to 56.12 kHz. The maximum values of average optical power and pulse energy were measured as ~11.61 mW and 207.05 nJ, respectively, at a ~1072 mW pump power.

Q-SWITCHED THULIUM-DOPED FIBER LASER AT 2 MICRON REGION BY 802 NM PUMPING

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
A. A. Latiff ◽  
M. T. Ahmad ◽  
Z. Zakaria ◽  
H. Ahmad ◽  
S. W. Harun
Keyword(s):  
Carbon Nanotubes ◽  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Laser Cavity ◽  
Pulse Generation ◽  
Q Switching ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

An 1892.4 nm ultrafast passive Q-switched fiber laser is demonstrated by using Thulium-doped fiber (TDF) in conjunction with a multi-walled carbon nanotubes (MWCNTs) as a saturable absorber (SA). The MWCNTs film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity with 802 nm pump for Q-switching pulse generation. The pulse repetition rate can be tuned from 3.8 to 4.6 kHz while the corresponding pulse width reduces from 22.1 to 18.4 μs as the pump power is increased from 187.3 to 194.2 mW. A higher performance Q-switched Thulium-doped fiber laser (TDFL) is expected to be achieved with the optimization of the MWCNT-SA saturable absorber and laser cavity.

Mode-hop-free single-longitudinal-mode erbium-doped fiber laser frequency scanned with a fiber ring resonator

1999 ◽  
Vol 38 (24) ◽  
pp. 5154 ◽  
Author(s):  
Seung Kwan Kim ◽  
George Stewart ◽  
Walter Johnstone ◽  
Brian Culshaw
Keyword(s):  
Fiber Laser ◽  
Ring Resonator ◽  
Longitudinal Mode ◽  
Laser Frequency ◽  
Single Longitudinal Mode ◽  
Fiber Ring ◽  
Erbium Doped ◽  
Fiber Ring Resonator

scholarly journals Mode-locked pulse generation from an all-fiberized, Tm-Ho-codoped fiber laser incorporating a graphene oxide-deposited side-polished fiber

2013 ◽  
Vol 21 (17) ◽  
pp. 20062 ◽  
Author(s):  
Minwan Jung ◽  
Joonhoi Koo ◽  
Jaehyun Park ◽  
Yong-Won Song ◽  
Young Min Jhon ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fiber Laser ◽  
Pulse Generation ◽  
Side Polished Fiber

scholarly journals Power controllable gain switched fiber laser at ~ 3 μm and ~ 2.1 μm

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yiwen Shi ◽  
Jianfeng Li ◽  
Chendong Lai ◽  
Hanlin Peng ◽  
Chen Zhu ◽  
...  
Keyword(s):  
Pump Power ◽  
Low Power ◽  
Fiber Laser ◽  
Output Power ◽  
Laser Power ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Maximum Output ◽  
Pump Source

AbstractBased on a hybrid pumping method consisting of a 1150 nm continuous-wave pump source and a 1950 nm pulsed pump source, we demonstrate a power controllable gain-switched fiber laser in dual wavebands at ~ 3 μm and ~ 2.1 μm. Different pumping schemes for pumping a Ho3+-doped ZBLAN fiber are studied. Using only the 1950 nm pulsed pump source, ~ 2.1 μm gain-switched pulses with single and double pulses are obtained separately at different pump powers. This phenomenon indicates that the 1950 nm pulsed pump source acts as a modulator to trigger different states of the ~ 2.1 μm pulses. Moreover, by fixing the 1150 nm pump power at 3.259 W and adjusting the 1950 nm pump power, the output power of the ~ 2.1 μm gain-switched pulsed laser is flexibly controlled while the ~ 3 μm laser power is almost unchanged, inducing the maximum output powers of 167.96 mW and 260.27 mW at 2910.16 nm and 2061.65 nm, respectively. These results suggest that the comparatively low power of the ~ 2.1 μm gain-switched pulsed laser in dual-waveband laser can be efficiently overcome by reasonably controlling the 1950 nm pump power.

Laser-driven self-exfoliation of graphene oxide layers on a fiber facet for Q switching of an Er-doped fiber laser at the longest wavelength

2020 ◽  
Vol 8 (8) ◽  
pp. 1324 ◽  
Author(s):  
Byungjoo Kim ◽  
Seongjin Hong ◽  
Jaedeok Park ◽  
Yongsoo Lee ◽  
Dong-il Yeom ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fiber Laser ◽  
Oxide Layers ◽  
Q Switching ◽  
Er Doped

RAMAN SCATTERING AND GAIN IN SILICON-ON-INSULATOR NANOWIRE WAVEGUIDES

2012 ◽  
Vol 21 (02) ◽  
pp. 1250021
Author(s):  
SHAIMAA MAHDI ◽  
STEFAN MEISTER ◽  
AWS AL-SAADI ◽  
BÜLENT A. FRANKE ◽  
SHA WANG ◽  
...  
Keyword(s):  
Pump Power ◽  
Raman Scattering ◽  
Fiber Laser ◽  
Continuous Wave ◽  
Coupling Efficiency ◽  
Silicon On Insulator ◽  
Raman Shift ◽  
Raman Gain ◽  
Raman Fiber Laser ◽  
Anti Stokes

Raman scattering in air-covered and SiO2 -covered Silicon-on-insulator waveguides of 1.25 cm length, 220 nm height and two widths of 2 μm or 0.45 μm was investigated. A continuous wave (CW) Raman fiber laser at 1454.8 nm with linewidth of <0.1 nm was used as a pump source. The coupling efficiency was estimated to be around 10% for one end facet. Spontaneous Raman shift of 521 cm-1 (1574.2 THz) scattering was observed at 1573.8 nm for SOI waveguides in air and 1574.2 nm for waveguides covered with SiO2 at pump power of <1.5 mW inside both waveguides of 2 and 0.45 μm. Anti-Stokes scattering was observed at 1352.8 nm with pump power of 16 mW. The stimulated Raman gain was calculated from spontaneous Raman efficiency. Total Raman on-off gain was determined to be 0.6 dB for waveguide with width of 2 μm and 1 dB for waveguide with width of 0.45 μm.

Theoretical Analysis of a Acoupled Fiber Ring Resonator

2013 ◽  
Vol 397-400 ◽  
pp. 765-771
Author(s):  
Xiao Min Zhang ◽  
Yan Ke Ci ◽  
Jin Li Yao ◽  
Jing Li Wang
Keyword(s):  
Theoretical Analysis ◽  
Power Distribution ◽  
Directional Coupler ◽  
Ring Resonator ◽  
Transmission Function ◽  
Optical Power ◽  
Fiber Ring ◽  
Fiber Ring Resonator ◽  
Simulation Results ◽  
Stimulated Brillouin

A fiber ring is very commonly used to generate stimulated Brillouin scatterings(SBS), especially by using fiber ring resonator. In this paper we theoretically analyzed some parameters of our interest in a coupled fiber ring resonator. We firstly analyzed a directional coupler, determined the optical power distribution among the four ports of the coupler. Then theoretically analyzed the transmission function of a coupled fiber ring resonator, followed by the simulation of the analysis. The simulation results show that the smaller the coupling coefficient is, the better the cavity finesse and extinction ration are, the lower the SBS threshold is, which is of great importance when it comes to the generation of SBS.

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