Dual-color, power-scalable DFB fibre laser system for kHz-linewidth terahertz generation

2007 ◽  
Author(s):  
Finn Eichhorn ◽  
Jens Engholm Pedersen ◽  
Claus Friis Pedersen ◽  
Peter Uhd Jepsen
Keyword(s):  
Laser System ◽  
Fibre Laser ◽  
Terahertz Generation ◽  
Dual Color

Fibre laser system providing generation of frequency-modulated pulses with a spectral width exceeding the gain linewidth

2016 ◽  
Vol 46 (12) ◽  
pp. 1092-1096 ◽  
Author(s):  
I O Zolotovskii ◽  
D A Korobko ◽  
D A Stoliarov
Keyword(s):  
Laser System ◽  
Spectral Width ◽  
Fibre Laser

scholarly journals From chaos to stability in soliton mode-locked fibre laser system

2021 ◽  
Vol 67 (6 Nov-Dec) ◽  
Author(s):  
Morteza A. Sharif ◽  
K. Ashabi
Keyword(s):  
Laser System ◽  
Control Process ◽  
Stable State ◽  
Chaotic Regime ◽  
Fibre Laser ◽  
Control Parameters ◽  
Single Side ◽  
Encryption And Decryption ◽  
Encryption Decryption ◽  
Unstable States

Intracavity energy rate in a soliton mode-locked fibre laser is derived by solving the Haus master equation. The influence of net gain, absorber response, saturation energy, nonlinearity and absorption are investigated on stable/unstable states. Intracavity modes include the zeroth, first and higher order solitons. Accordingly, chaotic regime as well as breather modes is recognized as a conventional intracavity state. However, tuning the control parameters also results in a reverse bifurcation and thus returning to a stable state. Accordingly, a chaos-based encryption/decryption system is proposed taking the advantage of using a single-side control process; both the encryption and decryption procedures can be achieved by one of the actions of increasing/decreasing the control parameters.

Hybrid Er/Yb fibre laser system for generating few-cycle 1.6 to 2.0 mm pulses optically synchronised with high-power pulses near 1 μm

2013 ◽  
Vol 43 (3) ◽  
pp. 256-262 ◽  
Author(s):  
A V Andrianov ◽  
E A Anashkina ◽  
S V Murav'ev ◽  
A V Kim
Keyword(s):  
High Power ◽  
Laser System ◽  
Fibre Laser

Thermal and morphological analysis of the interaction effect of different assist gases with gas-filled closed-cell aluminium foam during laser cutting process

2020 ◽  
pp. 095440542091725
Author(s):  
Mohammad Shahid Raza ◽  
Susmita Datta ◽  
Partha Saha
Keyword(s):  
Interaction Effect ◽  
Laser Cutting ◽  
Laser System ◽  
Aluminium Foam ◽  
Cutting Process ◽  
Fibre Laser ◽  
Closed Cell ◽  
Structural Applications ◽  
In Situ Reactions

Closed-cell aluminium foam, a porous structure, is effectively used for insulation, structural applications, packaging and filtering. Cutting of aluminium foam with the help of fibre laser is an efficient method due to the inherent advantages of fibre laser. Laser cutting of aluminium foam was carried out using a 2-kW fibre laser system for varying process parameters and different assist gas environments. Use of different foaming agents results in the generation of gas-filled pores. During the laser cutting process, the interaction of these gas-filled pores with assist gas results in in-situ reactions, generating different kerf quality. This interaction effect of foam cutting was reported using optical, metallurgical and thermal analysis. Thermal cycles were recorded to understand the occurrence of different in-situ reactions. From the temperature signal for different assist gases, oxygen showed the highest temperature, followed by nitrogen and argon. Argon assist gas gave minimum kerf width, while nitrogen assist gas produced minimum dross. Elemental and phase analysis showed the presence of new compounds and intermetallics in the cut section that stipulated the occurrence of in-situ reactions during the cutting process. The internal pore surface showed the presence of spatter in case of oxygen, while nitrogen and argon gas environment showed relatively less pore-clogging.

Widely tunable, fully automated, all-fiber dual-color laser system for stimulated Raman imaging

2017 ◽  
Author(s):  
Thomas Gottschall ◽  
Tobias Meyer ◽  
Cesar Jauregui ◽  
Florian Just ◽  
Tino Eidam ◽  
...  
Keyword(s):  
Laser System ◽  
Raman Imaging ◽  
Dual Color ◽  
Stimulated Raman

All fibre laser system with 0.1 W output power in blue spectral range

1997 ◽  
Vol 33 (16) ◽  
pp. 1383 ◽  
Author(s):  
H. Zellmer ◽  
S. Buteau ◽  
A. Tünnermann ◽  
H. Welling
Keyword(s):  
Output Power ◽  
Spectral Range ◽  
Laser System ◽  
Fibre Laser

Phase locking of a seven-channel continuous wave fibre laser system by a stochastic parallel gradient algorithm

2014 ◽  
Vol 44 (11) ◽  
pp. 1039-1042 ◽  
Author(s):  
M V Volkov ◽  
S G Garanin ◽  
Yu V Dolgopolov ◽  
A V Kopalkin ◽  
S M Kulikov ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Phase Locking ◽  
Laser System ◽  
Gradient Algorithm ◽  
Fibre Laser

scholarly journals Intensity-dependent self-induced dual-color laser phase modulation and its effect on terahertz generation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chen Gong ◽  
Iwao Kawayama ◽  
Hironaru Murakami ◽  
Takahiro Teramoto ◽  
Masayoshi Tonouchi
Keyword(s):  
Phase Modulation ◽  
Relative Phase ◽  
Refractive Index Change ◽  
Pump Energy ◽  
Terahertz Generation ◽  
Dual Color ◽  
Air Dispersion ◽  
Higher Power ◽  
Thz Sources ◽  
Additional Phase

AbstractPowerful, broadband terahertz (THz) pulses and its application attract an exponential growth of interests. Dual-color laser filamentation in gases is one of the promising THz sources because of the scalability of the THz energy and wavelength with input parameters. But the additional phase induced by the nonlinearities associated with high intensities cannot be neglected because it may result in modulation of the THz waves. We investigate the influences of the infrared pump energy and air dispersion on the terahertz generation in dual-color laser filament. We observe that optimum dual-color laser relative phase of the THz generation undergoes a linear shift with increasing pump energy due to the intensity-induced refractive index change. This phase shift is verified by the spectral broadening of a two-color laser affected by the same mechanism. The result improves our understanding of the theoretical framework for a higher power THz source.

scholarly journals Optimisation of parameters laser cutting of oil palm fronds using fibre pulsed laser of 1064 Nm wavelength system

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Mohd Ikmal Hafizi Azaman ◽  
Mohd Adzir Mahdi ◽  
Mohd Rizal Ahmad ◽  
Abd Rahim Shuib ◽  
Mohd Ramdhan Khalid ◽  
...  
Keyword(s):  
Oil Palm ◽  
Laser Cutting ◽  
Laser System ◽  
Pulsed Laser ◽  
Cutting Parameters ◽  
Fibre Laser ◽  
Oil Palm Fronds ◽  
Fresh Fruit Bunches ◽  
Primary Output ◽  
Palm Fronds

Oil palm plantations produce fresh fruit bunches (FFB) as their primary output. Over the years, several technologies for cutting oil palm fronds and FFB have been developed and only a few of these technologies have been taken up by the industry. A study to explore the potential of fibre lasers as an alternative technology to cut oil palm fronds has been initiated where in this study laser cutting parameters using a 250 mm focus lens by manipulating power, speed and frequency are being optimised. The pulse fibre laser system used in this work operates at the wavelength and power of 1064 nm and 50 kW respectively where it is equivalent to 2 mJ of energy. Characterising and optimising the laser system with the 250 mm lens, an optimisation study is conducted in order to find a suitable working range for the fibre pulsed laser system to perform oil palm frond cutting. This study concludes that all three parameters; frequency, power and speed play huge roles in determining the quality and efficiency of the laser cutting. High frequency and speed with power above 80 % and 1 mm-1 will yield the desired results.

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