Threshold Pump Power And Stability Zone Study of A Cw Ti:sa Laser Based on Using Two Different Dielectric Broadband High Reflective Cavity Mirrors

The present work study the optical parameters for CW operation in Ti:Sapphire laser system with the focus on stability zone and threshold pump power. The main aim of this study is to explore the influence of a broadband dielectric resonator mirrors used in the laser cavity on the stability zone and threshold pump power. This effect has been determined by using two types of mirrors with different broadband reflection. The experimental results show the dependence of the stability and laser threshold pump on broadband dielectric mirrors. For a broader dielectric mirror, the stability zone shows larger stable distance with respect to the narrower mirror. Moreover, the threshold pump for the broader band is smaller than the narrower. This study allows researcher choosing the appropriate optical components for generating more stable laser with small threshold pump power.

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Single-pump multiwavelength hybrid raman-EDF laser using a non-adiabatic microfiber interferometer

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v18.i3.pp1446-1453 ◽

2020 ◽

Vol 18 (3) ◽

pp. 1446

Author(s):

Muhammad Faiz Ibrahim ◽

Nani Fadzlina Naim ◽

Mas Izyani Bt Md Ali

Keyword(s):

Pump Power ◽

External Cavity ◽

Laser Cavity ◽

Pump Unit ◽

Linear Cavity ◽

Reflective Mirror ◽

Multiwavelength Fiber Laser ◽

Output Laser ◽

Multiwavelength Laser ◽

Stable Laser

This paper presents a multiwavelength fiber laser utilizing non-adiabatic tapered EDF based Mach Zehnder Interferometer (MZI) in hybrid Raman-EDF gains design with a linear cavity. A stable laser was obtained from the single pump with a 1497 nm wavelength through the employment of a 20:80 optical circulators and 99% reflective mirror. The generated backward propagating oscillates inside the laser cavity generate the stable multiwavelength output with 4 channels, which is coupled out via the 10:90 coupler and the output laser is characterized using an OSA with a resolution of 0.015 nm. The hybrid Raman-EDF gain is pumped from the external cavity by a Raman Pump Unit (RPU) and produced a stable multiwavelength laser output with SMSR of 28.9 dBm for 300 mW pump power, 30.7 dBm for 1000 mW pump power and 33.7 dBm for 1500 mW pump power.

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

Jurnal Teknologi ◽

10.11113/jt.v74.4729 ◽

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.

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

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v8i4.1609 ◽

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.

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Influence of the microresonator nonlinearity on the self-injection locking effect

EPJ Web of Conferences ◽

10.1051/epjconf/201922002006 ◽

2019 ◽

Vol 220 ◽

pp. 02006 ◽

Cited By ~ 1

Author(s):

Nikita Kondratiev ◽

Alexander Gorodnitskiy ◽

Valery Lobanov

Keyword(s):

Pump Power ◽

Injection Locking ◽

The Self ◽

The Stability ◽

Locking Effect

The effect of self-injection locking of a laser to a nonlinear microresonator is considered. It is shown that an additional detuning arises in the system, depending on the pump power. This effect can contribute to the generation of optical combs in the pull mode, which will increase the stability of the generated signal.

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Gas Seeps at the Edge of the Gas Hydrate Stability Zone on Brazil’s Continental Margin

Geosciences ◽

10.3390/geosciences9050193 ◽

2019 ◽

Vol 9 (5) ◽

pp. 193 ◽

Cited By ~ 3

Author(s):

Marcelo Ketzer ◽

Daniel Praeg ◽

Maria A.G. Pivel ◽

Adolpho H. Augustin ◽

Luiz F. Rodrigues ◽

...

Keyword(s):

Gravitational Collapse ◽

Continental Margin ◽

Gas Hydrate ◽

Deep Sea ◽

Rio Grande ◽

Cold Seep ◽

Stability Zone ◽

The Stability ◽

Sea Fan ◽

Hydrate Stability

Gas hydrate provinces occur in two sedimentary basins along Brazil’s continental margin: (1) The Rio Grande Cone in the southeast, and (2) the Amazon deep-sea fan in the equatorial region. The occurrence of gas hydrates in these depocenters was first detected geophysically and has recently been proven by seafloor sampling of gas vents, detected as water column acoustic anomalies rising from seafloor depressions (pockmarks) and/or mounds, many associated with seafloor faults formed by the gravitational collapse of both depocenters. The gas vents include typical features of cold seep systems, including shallow sulphate reduction depths (<4 m), authigenic carbonate pavements, and chemosynthetic ecosystems. In both areas, gas sampled in hydrate and in sediments is dominantly formed by biogenic methane. Calculation of the methane hydrate stability zone for water temperatures in the two areas shows that gas vents occur along its feather edge (water depths between 510 and 760 m in the Rio Grande Cone and between 500 and 670 m in the Amazon deep-sea fan), but also in deeper waters within the stability zone. Gas venting along the feather edge of the stability zone could reflect gas hydrate dissociation and release to the oceans, as inferred on other continental margins, or upward fluid flow through the stability zone facilitated by tectonic structures recording the gravitational collapse of both depocenters. The potential quantity of venting gas on the Brazilian margin under different scenarios of natural or anthropogenic change requires further investigation. The studied areas provide natural laboratories where these critical processes can be analyzed and quantified.

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STATISTICAL PROPERTIES OF INTENSITY FLUCTUATION OF SATURATION LASER MODEL DRIVEN BY CROSS-CORRELATED ADDITIVE AND MULTIPLICATIVE NOISES

International Journal of Modern Physics B ◽

10.1142/s0217979210055755 ◽

2010 ◽

Vol 24 (14) ◽

pp. 2175-2188 ◽

Cited By ~ 3

Author(s):

PING ZHU ◽

YI JIE ZHU

Keyword(s):

Probability Distribution ◽

Cross Correlation ◽

Laser Intensity ◽

Laser System ◽

Stationary Probability ◽

Stationary Probability Distribution ◽

Model Driven ◽

Multiplicative Noises ◽

Laser Model ◽

The Stability

Statistical properties of the intensity fluctuation of a saturation laser model driven by cross-correlation additive and multiplicative noises are investigated. Using the Novikov theorem and the projection operator method, we obtain the analytic expressions of the stationary probability distribution Pst(I), the relaxation time Tc, and the normalized variance λ2(0) of the system. By numerical computation, we discussed the effects of the cross-correlation strength λ, the cross-correlation time τ, the quantum noise intensity D, and the pump noise intensity Q for the fluctuation of the laser intensity. Above the threshold, λ weakens the stationary probability distribution, speeds up the startup velocity of the laser system from start status to steady work, and attenuates the stability of laser intensity output; however, τ strengthens the stationary probability distribution and strengths the stability of laser intensity output; when λ < 0, τ speeds up the startup; on the contrast, when λ > 0, τ slows down the startup. D and Q make the relaxation time exhibit extremum structure, that is, the startup time possesses the least values. At the threshold, τ cannot generate the effects for the saturation laser system, λ expedites the startup velocity and weakens the stability of laser intensity output. Below threshold, the effects of λ and τ not only relate to λ and τ, but also relate to other parameters of the system.

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Experimental and Numerical Comparison Q-Switched Fiber Laser Generation using Graphene as Saturable Absorber

MATEC Web of Conferences ◽

10.1051/matecconf/201815001009 ◽

2018 ◽

Vol 150 ◽

pp. 01009

Author(s):

Noor Azura Awang ◽

Nor Syuhada Aziz ◽

Atiqah Nabieha Azmi ◽

Fatin Shaqira Hadi ◽

Zahariah Zakaria

Keyword(s):

Saturable Absorber ◽

Signal To Noise Ratio ◽

Laser Cavity ◽

Laser Generation ◽

Measured Signal ◽

Numerical Comparison ◽

Central Wavelength ◽

Maximum Pulse Energy ◽

Diode Pumped ◽

The Stability

We demonstrated the comparison experimentally and numerically a compact Q-switched erbium-doped fiber (EDF) laser based on graphene as a saturable absorber (SA). By optically driven deposition of graphene on a fiber core, the SA is constructed and inserted into a diode-pumped EDF laser cavity. Lasing in CW region starts at 10 mW, whereas stable self-starting Q-switching with a central wavelength of 1530 nm begins at 18 mW. In this paper, at 35 mW, the maximum pulse energy reaches at 2 μJ with pulse repetition rate of 1 MHz and the narrowest pulse width is around 10 μs is obtained. The stability of the pulse is verified from the radio-frequency (RF) spectrum with a measured signal-to-noise ratio (SNR) of 48 dB. In this study, the design is compared with the simulation using the Optisystem software. The output power of the experimental study is also compared with the simulation to examine the performance.

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