scholarly journals Saturable Absorption and Modulation Characteristics of Laser with Graphene Oxide Spin Coated on ITO Substrate

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Xin Li ◽  
Haikun Zhang ◽  
Peiji Wang ◽  
Guiqiu Li ◽  
Shengzhi Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Saturable Absorber ◽  
Indium Tin Oxide ◽  
Peak Power ◽  
Continuous Wave ◽  
Laser Cavity ◽  
Saturable Absorption ◽  
Continuous Wave Laser ◽  
Output Laser

The graphene oxide (GO) thin film has been obtained by mixture of GO spin coated on substrate of indium tin oxide (ITO). The experiment has shown that continuous-wave laser is modulated when the graphene oxide saturable absorber (GO-SA) is employed in the 1064 nm laser cavity. The shortest pulse width is 108 ns at the pump power of 5.04 W. Other output laser characteristics, such as the threshold pump power, the repetition rate, and the peak power, have also been measured. The results have demonstrated that graphene oxide is an available saturable absorber for 1064 nm passive Q-switching laser.

scholarly journals Experimental Investigation of Double-End Pumped Tm, Ho: GdVO4 Laser at Cryogenic Temperature

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 798
Author(s):  
Yanqiu Du ◽  
Tongyu Dai ◽  
Hui Sun ◽  
Hui Kang ◽  
Hongyang Xia ◽  
...  
Keyword(s):  
Pump Power ◽  
Peak Power ◽  
Continuous Wave ◽  
Maximum Output Power ◽  
Operating Mode ◽  
Maximum Output ◽  
Continuous Wave Laser ◽  
Pump Mode ◽  
Maximum Value ◽  
Output Characteristics

We describe comparatively cryogenically cooled Tm, Ho: GdVO4 lasers with an emission wavelength of 2.05 μm under continuous wave and pulse operating mode. By varying the transmittance of output couplers to be 0.40 for a continuous wave laser, the maximum output power of 7.4 W was generated with a slope efficiency of 43.3% when the absorbed pump power was increased to 18.7 W. For passively Q-switched lasers, the output characteristics were researched through altering pump mode radius. When the pump mode radius focused into the Tm, Ho: GdVO4 center equaled near 600 μm, the peak power was increased to be the maximum value of 9.9 kW at the absorbed pump power of 11.8 W. The pulse energy of 0.39 mJ was achieved at the same absorbed pump power with repetition of 5.7 kHz.

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.

scholarly journals Graphene slurry based passive Q-switcher in erbium doped fiber laser

2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Siti Nur Fatin Zuikafly ◽  
Nor Farhah Razak ◽  
Rizuan Mohd Rosnan ◽  
Sulaiman Wadi Harun ◽  
Fauzan Ahmad
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Pulse Width ◽  
Peak Power ◽  
Signal To Noise Ratio ◽  
Pulsed Laser ◽  
Laser Cavity ◽  
Signal To Noise ◽  
Maximum Pulse Energy ◽  
Erbium Doped

In this work, a Graphene slurry based passive Q-switcher fabricated from Graphene-Polylactic acid (PLA) filament which is used for 3D printing. To produce the Graphene slurry, the diameter of the filament was reduced and Tetrahydrofuran (THF) was used to dissolve the PLA. The Graphene-THF suspension was drop cast to the end of a fiber ferrule and the THF then evaporated to develop Graphene slurry based SA which is integrated in fiber laser cavity. At threshold input pump power of 30.45 mW, a Q-switched Erbium-doped fiber laser (EDFL) can be observed with the wavelength centered at 1531.01 nm and this remained stable up to a pump power of 179.5 mW. As the pump power was increased gradually, an increase in the repetition rates was recorded from 42 kHz to 125 kHz, while the pulse width was reduced to 2.58 μs from 6.74 μs. The Q-switched laser yielded a maximum pulse energy and peak power of 11.68 nJ and 4.16 mW, respectively. The proposed Graphene slurry based saturable absorber also produced a signal-to-noise ratio of 44 dB indicating a stable Q-switched pulsed laser.

Passively harmonic mode-locked fiber laser based on ReS2 saturable absorber

2017 ◽  
Vol 31 (18) ◽  
pp. 1750206 ◽  
Author(s):  
Feifei Lu
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
Repetition Rate ◽  
Mode Locking ◽  
High Repetition Rate ◽  
Pulse Interval ◽  
Saturable Absorption ◽  
Harmonic Mode

We demonstrate the generation of harmonic mode-locking (HML) in an erbium-doped fiber laser with a microfiber-based rhenium disulfide (ReS2) saturable absorber (SA). Taking advantages of both saturable absorption and large third-order nonlinear effect of ReS2, HML pulse with 318.5 MHz repetition rate can be obtained, corresponding to 168th harmonic of fundamental repetition frequency of 1.896 MHz. When the pump power is increased gradually, the pulse interval remains constant, while the output power increases linearly. At the pump power of 450 mW, the output power is [Formula: see text]12 mW. The proposed high-repetition-rate pulse lasers would attract considerable attention due to its potential applications in soliton communications and frequency combs.

Tailoring the free carrier and optoelectric properties of indium tin oxide film via quasi-continuous-wave laser annealing

2021 ◽  
Vol 538 ◽  
pp. 148104
Author(s):  
Liping Peng ◽  
Yuan'an Zhao ◽  
Xiaofeng Liu ◽  
Zhaoliang Cao ◽  
Dawei Li ◽  
...  
Keyword(s):  
Oxide Film ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Laser Annealing ◽  
Continuous Wave ◽  
Free Carrier ◽  
Continuous Wave Laser ◽  
Wave Laser

scholarly journals Temperature dependence of initial deformation and cracks of indium tin oxide film by quasi-continuous-wave laser irradiations

2020 ◽  
Vol 10 (10) ◽  
pp. 2394
Author(s):  
Liping Peng ◽  
Yuan’an Zhao ◽  
Xiaofeng Liu ◽  
Zhaoliang Cao ◽  
Dawei Li ◽  
...  
Keyword(s):  
Oxide Film ◽  
Temperature Dependence ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Continuous Wave ◽  
Initial Deformation ◽  
Continuous Wave Laser ◽  
Wave Laser

scholarly journals Q-switched EDF LASER Cavity using ITO as Saturable Absorber

2021 ◽  
Vol 11 ◽  
Author(s):  
Bilal Nizmani ◽  
Faisal Ahmed Memon ◽  
Bhawani Shankar Chowdhary ◽  
Ghulam Fizza ◽  
Suleiman Wadi Harun
Keyword(s):  
Saturable Absorber ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Laser Cavity ◽  
Pulse Generation ◽  
Glass Slide ◽  
Center Wavelength ◽  
Erbium Doped ◽  
Electron Beam Deposition ◽  
Beam Deposition

In this work, we have experimentally reported Q-switched pulse generation by indium tin oxide as a saturable absorber. First the glass slide was placed in electron beam deposition chamber and indium tin oxide layer was coated over the glass slide. Then the indium tin oxide was exfoliated from the glass slide, over the fiber ferrules in erbium doped fiber laser cavity. The Q-switched laser operated at center wavelength of 1562.6 nm. The repetition rate and pulse width were obtained to be 48.31-64.52 kHz and 5.65-4.23 µs, respectively.

scholarly journals Passively Q-switched Erbium-Doped Fiber Laser based on Graphene Oxide as Saturable Absorber

2018 ◽  
Vol 39 (3) ◽  
pp. 307-310 ◽  
Author(s):  
A. K. W. Mansoor ◽  
Belal Ahmed Hamida ◽  
Tawfig Eltaif ◽  
E. I. Ismail ◽  
N. A. A. Kadir ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Laser Cavity ◽  
Experimental Results ◽  
Laser Output ◽  
Output Energy ◽  
Erbium Doped

Abstract In this paper, passively Q-switched fiber laser is demonstrated and the laser output energy is stabilized by using 2.4 m Erbium-doped fiber laser (EDFL) with a graphene oxide used as saturable absorber (GO-SA). According to the experimental results in the Q-switched configuration, the laser cavity emits a wavelength centered at 1,558.75 nm, and by inserting the GO-SA into EDFL cavity, hence, the laser output energy around 1.68 nJ with an FWHM pulse width of 2.3 µs at 123.5 kHz was achieved.

Power-Dependent Optical Property of Yb/Er: NaGdF4@Yb: NaGdF4@Yb:NaNdF4 Nanocrystals

NANO ◽  
2017 ◽  
Vol 12 (07) ◽  
pp. 1750086 ◽  
Author(s):  
Lei Lei ◽  
Shiqing Xu ◽  
Jingyi Yang ◽  
Ho Wai Howard Lee
Keyword(s):  
Femtosecond Laser ◽  
Peak Power ◽  
Continuous Wave ◽  
Optical Measurement ◽  
High Peak Power ◽  
Continuous Wave Laser ◽  
Transfer Processes ◽  
Wave Laser ◽  
Power And Energy ◽  
Down Conversion

In most of the reports on nanocrystal (NC) luminescent, the power depedence of luminescent intensity is studied using a continuous-wave laser with low power density, and the slopes of those different emission bands keep unchanged. In this paper, the up/down conversion of monodisperse Yb/Er: NaGdF4@Yb: NaGdF4@Yb: NaNdF4 NCs under the excitation of 800[Formula: see text]nm femtosecond laser was detected simultaneously by a home-built optical measurement setup. The power-dependent optical properties under the excitation of femtosecond laser are quite different from the normal situation, which is due to their high peak power and energy transfer processes: Nd[Formula: see text].

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