Mid IR Holmium, Praseodymium - doped Fluoride Fiber Laser Pulse Operation

2021 ◽  
Vol 14 (4) ◽  
pp. 275-286
Keyword(s):  
Fiber Laser ◽  
Fiber Lasers ◽  
Peak Power ◽  
Modulation Frequency ◽  
Zero Order ◽  
Pumping Power ◽  
Pulse Operation ◽  
Acousto Optic Modulator ◽  
First Order ◽  
Fluoride Fiber

Abstract: Pulsed operation of a novel single-clad mid IR Ho3+, Pr3+ co-doped ZBLAN fiber laser ‎excited by a Nd:YAG laser at 1064 nm has been demonstrated using pulse-pumping. An acousto-optic modulator (AOM) has been used to modulate the CW input pump ‎laser and used in either zero-order or first-order operation. A regular output train of pulses was generated for modulation frequencies over 1 Hz - 100 kHz ‎with zero-order operation of the AOM. A maximum peak power of ~ 50 W and pulse ‎duration of ~200 ns have been obtained for a modulation frequency of 45 kHz and 9.3 ‎W pump power. Single-end and double-end pumping of the ‎first-order AOM operation for the fiber have also been demonstrated to avoid the overheating of the modulator which ‎reduces the modulation efficiency. The same results as the zero AOM operation were obtained when the fiber laser was pumped with a pumping power of about 5 watts. Keywords: Fiber lasers, Pump pulsed operation, Acousto-optic modulator (AOM), Single-end and double-end pumping. PACs: Fiber lasers, 42.55.Wd, Acousto-optical devices, 42.79.Jq.

scholarly journals Numerical Study on the Soliton Mode-Locking of the Er3+-Doped Fluoride Fiber Laser at ~3 μm with Nonlinear Polarization Rotation

Photonics ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 25 ◽  
Author(s):  
Feijuan Zhang ◽  
Wenyan Yan ◽  
Shengnan Liang ◽  
Chao Tan ◽  
Pinghua Tang
Keyword(s):  
Fiber Laser ◽  
Fiber Lasers ◽  
Numerical Study ◽  
High Energy ◽  
Mode Locking ◽  
Polarization Rotation ◽  
Nonlinear Polarization ◽  
Fiber Ring ◽  
Fluoride Fiber ◽  
Nonlinear Polarization Rotation

Recent interest in the application of mid-infrared (mid-IR) lasers has made the generation of ~3 µm ultrafast pulses a hot topic. Recently, the generation of femtosecond-scale pulses in Er3+-doped fluoride fiber lasers has been realized by nonlinear polarization rotation (NPR). However, a numerical study on these fiber lasers has not been reported yet. In this work, the output properties of the NPR passively mode-locked Er3+-doped fluoride fiber ring laser in ~3 µm have been numerically investigated based on the coupled Ginzburg–Landu equation. The simulation results indicate that stable uniform solitons (0.75 nJ) with the pulse duration of femtosecond-scale can be generated from this fiber laser. This numerical investigation can provide some reference for developing the high energy femtosecond soliton fiber lasers in the mid-IR.

FACTORS THAT INFLUENCE PEAK POWER OF Q-SWITCHED FIBER LASER

2007 ◽  
Vol 21 (14) ◽  
pp. 843-850 ◽  
Author(s):  
LIANJU SHANG ◽  
JIPING NING ◽  
ZHENZHONG CAO ◽  
GUOFANG FAN ◽  
ZHIQIANG CHEN ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Fiber Lasers ◽  
Peak Power ◽  
Frequency Conversion ◽  
Nonlinear Frequency ◽  
Laser Marking ◽  
Nonlinear Frequency Conversion ◽  
Optical Time Domain Reflectometer ◽  
Range Finding ◽  
Optical Time

Q-switched fiber lasers are very attractive sources in many applications such as military affairs, surgical operation, laser machining, laser marking, nonlinear frequency conversion, range finding, remote sensing and optical time domain reflectometer. To improve the peak power of Q-switched fiber laser is what we pursue, and to know the factors that influence the peak power is what we should make clear first. In this paper, certain essential factors that influence the peak power are presented, with their theoretical basis clarified, which may be helpful to the design of the kindred Q-switched fiber lasers.

Kinetics of catalytic reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst

1983 ◽  
Vol 48 (11) ◽  
pp. 3202-3208 ◽  
Author(s):  
Zdeněk Musil ◽  
Vladimír Pour
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxide ◽  
Rate Equation ◽  
Catalytic Reduction ◽  
Zero Order ◽  
Spectroscopic Measurements ◽  
First Order ◽  
Ir Spectroscopic ◽  
Kinetics Of ◽  
Al2o3 Catalyst

The kinetics of the reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst (8.36 mass % CuO) were determined at temperatures between 413 and 473 K. The reaction was found to be first order in NO and zero order in CO. The observed kinetics are consistent with a rate equation derived from a mechanism proposed on the basis of IR spectroscopic measurements.

scholarly journals Layered Ta2NiS5 Q-switcher for mid-infrared fluoride fiber laser

2021 ◽  
pp. 1-1
Author(s):  
Qinwen Duan ◽  
Lingling Yang ◽  
Yuan He ◽  
Longlong Chen ◽  
Jie Li ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Mid Infrared ◽  
Fluoride Fiber

scholarly journals Metallic 2H-Tantalum Selenide Nanomaterials as Saturable Absorber for Dual-Wavelength Q-Switched Fiber Laser

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 239
Author(s):  
Lingling Yang ◽  
Ruwei Zhao ◽  
Duanduan Wu ◽  
Tianxiang Xu ◽  
Xiaobiao Liu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Peak Power ◽  
Dual Wavelength ◽  
Transition Metal Dichalcogenide ◽  
Promising Candidate ◽  
Laser Applications ◽  
Maximum Pulse Energy ◽  
Structure Simulation ◽  
Tantalum Selenide

A novel 2H-phase transition metal dichalcogenide (TMD)–tantalum selenide (TaSe2) with metallic bandgap structure is a potential photoelectric material. A band structure simulation of TaSe2 via ab initio method indicated its metallic property. An effective multilayered TaSe2 saturable absorber (SA) was fabricated using liquid-phase exfoliation and optically driven deposition. The prepared 2H–TaSe2 SA was successfully used for a dual-wavelength Q-switched fiber laser with the minimum pulse width of 2.95 μs and the maximum peak power of 64 W. The repetition rate of the maximum pulse energy of 89.9 kHz was at the level of 188.9 nJ. The metallic 2H–TaSe2 with satisfactory saturable absorbing capability is a promising candidate for pulsed laser applications.

scholarly journals An Eye-Safe, SBS-Free Coherent Fiber Laser LIDAR Transmitter with Millijoule Energy and High Average Power

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 15
Author(s):  
Mehmetcan Akbulut ◽  
Leonid Kotov ◽  
Kort Wiersma ◽  
Jie Zong ◽  
Maohe Li ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Repetition Rate ◽  
Peak Power ◽  
Figure Of Merit ◽  
Current System ◽  
Glass Fibers ◽  
Average Power ◽  
High Gain ◽  
Short Length ◽  
High Average Power

We report on an eye-safe, transform-limited, millijoule energy, and high average power fiber laser. The high gain and short length of the NP phosphate-glass fibers enable the SBS-free operation with kW level peak power. The output energy is up to 1.3 mJ, and the average power is up to 23 W at an 18 kHz repetition rate with 600 ns pulses (peak power > 2.1 kW). The PER is ≈16 dB and the M2 of the beam is 1.33 × 1.18. The coherent LIDAR Figure Of Merit (FOM) is 174 mJ*sqrt(Hz), which to our knowledge is the highest reported for a fiber laser. We also report 0.75 mJ energy and >3.7 kW peak power with down to 200 ns pulses and up to 1.21 mJ energy with a 3–5 kHz repetition rate operation of the current system.

Area-based speciation kinetic analysis of the multipollutant removal in Constructed Wetlands to enhance its treatment efficiency

2021 ◽  
Author(s):  
Manoj Kumar ◽  
Rajesh Singh
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Analysis ◽  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Zero Order ◽  
Pollutant Removal ◽  
Municipal Wastewater Treatment ◽  
Treatment Efficiency ◽  
First Order ◽  
Present Study Area

In the present study area-based, pollutant removal kinetic analysis was considered using the Zero-order, first-order decay and efficiency loss (EL) models in the constructed wetlands (CWs) for municipal wastewater treatment....

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