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

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.

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

2020 ◽  
Vol 23 (2) ◽  
pp. 70-86
Author(s):  
Awaz Adil Kareem ◽  
Diyar A. S. Sadiq Mayi
Keyword(s):  
Pump Power ◽  
Laser System ◽  
Laser Cavity ◽  
Optical Parameters ◽  
Stability Zone ◽  
Optical Components ◽  
Threshold Pump Power ◽  
Dielectric Mirror ◽  
The Stability ◽  
Stable Laser

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.

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.

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.

scholarly journals Nonlinearity Effect on Multiwavelength fiber laser based on Sagnac loop mirror interferometer

2021 ◽  
Author(s):  
Abdul Hadi Sulaiman ◽  
Nur Maizatul Nadia Najamhuri ◽  
Muhd Amirul Hafizi Sukor ◽  
Aiman Ismail ◽  
Fairuz Abdullah ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Extinction Ratio ◽  
Laser Cavity ◽  
Fiber Amplifier ◽  
Observation Time ◽  
Lasing Spectrum ◽  
Loss Mechanism ◽  
Highly Nonlinear ◽  
Multiwavelength Fiber Laser ◽  
Loop Mirror

This paper demonstrates a multiwavelength fiber laser (MWFL) with erbiumdoped fiber amplifier (EDFA) as gain  medium and Sagnac loop mirror interferometer as filter. Stable and flat lasing spectrum was achieved when highly  nonlinear fiber (HNLF) was inserted into the laser cavity. The number of lasing lines and extinction ratio (ER) was directly influenced by EDFA gain where at maximum setting, 14 lasing lines with ER of 19 dB were generated. The  stable and flat spectrum achieved spanned about 1.6 nm. This is due to the induced intensity dependent loss  mechanism in the cavity by adjusting the half-wave plate of the polarization controller in combination with the  HNLF. The MWFL output showed peak power variation of about 2.1 dB within 100 minutes of observation time.

scholarly journals Bi2Te3 Topological Insulator for Domain-Wall Dark Pulse Generation from Thulium-Doped Fiber Laser

Crystals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 337 ◽  
Author(s):  
Joonhoi Koo ◽  
Nandam Ashok ◽  
Dong Hwan Kim ◽  
Woojin Shin
Keyword(s):  
Pump Power ◽  
Domain Wall ◽  
Fiber Laser ◽  
Topological Insulator ◽  
Repetition Rate ◽  
Pulse Width ◽  
Laser Cavity ◽  
Pulse Generation ◽  
Distilled Water ◽  
Dark Pulse

We have experimentally demonstrated domain-wall (DW) dark pulses from a thulium-doped fiber laser incorporating a topological insulator saturable absorber (SA). The bulk-structured Bi2Te3 was used as the SA, which was constructed on a fiber ferrule platform through the deposition of the Bi2Te3 mixed with distilled water. The DW dark pulses were generated from the thulium-doped fiber laser cavity with a dual wavelength at 1956 nm and 1958 nm. The dark pulse width and the repetition rate were measured as ~10.3 ns and ~20.7 MHz over the pump power of ~80 mW, respectively. To the best of our knowledge, this work is the first demonstrated generation of the DW dark pulse from a thulium-doped fiber laser using nanomaterial-based SA.

Graphene based Q-switched tunable S-band fiber laser incorporating arrayed waveguide gratings (AWG)

2014 ◽  
Vol 23 (01) ◽  
pp. 1450004 ◽  
Author(s):  
F. D. Muhammad ◽  
M. Z. Zulkifli ◽  
H. Ahmad
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Pulse Duration ◽  
Repetition Rate ◽  
Tunable Laser ◽  
Laser Cavity ◽  
Laser Source ◽  
Arrayed Waveguide Gratings ◽  
Waveguide Gratings ◽  
Arrayed Waveguide

We present in this paper, the result of successful fabrication of a novel graphene-based Q-switched fiber laser in the S-band region using an arrayed waveguide gratings (AWGs). The S-band lasing is realized by employing a depressed-cladding erbium doped fiber (DC-EDF), as the gain medium. A new ferrule-to-ferrule and stepwise optical extraction method is introduced and employed for depositing the thin graphene layer within the fiber laser cavity as the saturable absorber, while a tunable laser source (TLS) is used for depositing graphene onto the fiber ferrule. A demonstration of performance characteristics of this device is presented showing a Q-switched threshold of 65.29 mW and a range of repetition rate from 73.6 kHz to 331.1 kHz, with a linear increment. Minimum pulse duration of 1.218 μs is obtained at a pump power of 100.44 mW. Additional measurements are performed on the characteristics of the output power, pulse duration, pulse repetition rate, pulse energy, and peak power with respect to the pump power.

A pump power controlled multiwavelength fiber laser with adjustable output channels at fixed wavelength

2011 ◽  
Vol 102 (3) ◽  
pp. 545-549 ◽  
Author(s):  
J. Tian ◽  
Y. Yao ◽  
J. J. Xiao ◽  
X. Xu ◽  
D. Chen
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Multiwavelength Fiber Laser

scholarly journals TiOxNy Thin Film Sputtered on a Fiber Ball Lens as Saturable Absorber for Passive Q-Switched Generation of a Single-Tunable/Dual-Wavelength Er-Yb Double Clad Fiber Laser

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 923
Author(s):  
Ricardo I. Álvarez-Tamayo ◽  
Omar Gaspar-Ramírez ◽  
Patricia Prieto-Cortés ◽  
Manuel García-Méndez ◽  
Antonio Barcelata-Pinzón
Keyword(s):  
Thin Film ◽  
Saturable Absorber ◽  
Laser Cavity ◽  
Laser Pulses ◽  
Interference Filter ◽  
Dual Wavelength ◽  
Laser Generation ◽  
Linear Cavity ◽  
Reflection Configuration ◽  
Fiber Ball

The use of titanium oxynitride (TiOxNy) thin films as a saturable absorber (SA) element for generation of passive Q-switched (PQS) laser pulses, from a linear cavity Er-Yb double-clad fiber (EYDCF) laser, is demonstrated. Additionally, the deposition of the material as a thin film covering a fiber micro-ball lens (MBL) structure is reported for the first time. The TiOxNy coating is deposited by a direct current (DC) magnetron-sputtering technique. The MBL is inserted within the laser cavity in a reflection configuration, alongside a reflecting mirror. As a result, the coated fiber MBL simultaneously acts as a SA element for PQS laser pulses generation and as an interference filter for wavelength selection and tuning of the generated laser line. Tunable single-laser emission in a wavelength range limited by dual-wavelength laser generation at 1541.96 and 1547.04 nm is obtained. PQS laser pulses with a repetition rate from 18.67 to 124.04 kHz, minimum pulse duration of 3.57 µs, maximum peak power of 0.359 W, and pulse energy of 1.28 µJ were obtained in a pump power range from 1 to 1.712 W.

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