scholarly journals AlGaInAs/InP Based Five & Three Quantum Wells Mode Locked Laser Diodes: A Comparative Study

2020 ◽  
Vol 26 (5) ◽  
pp. 22-27
Author(s):  
Jehan Akbar ◽  
Muhammad Hanif ◽  
Muhammad Azhar Naeem ◽  
Kamran Abid
Keyword(s):  
Active Region ◽  
Quantum Wells ◽  
Laser Diodes ◽  
Mode Locking ◽  
Field Pattern ◽  
Far Field ◽  
Optical Pulses ◽  
Wide Range ◽  
Mode Locked Laser ◽  
Far Field Pattern

Comparison of performance of semiconductor mode-locked laser diodes fabricated using AlGaInAs/InP material containing 5 and 3 quantum wells (QWs) inside the active region is reported. The simulations and experimental results show that lasers containing five QWs materials produce larger beam divergence and temporally broader optical pulses. For improvement in the mode-locking of lasers and reducing the far-field pattern, the number of QWs inside the active region was decreased from five to three and a far-field decreasing layer along with a thick spacer layer were introduced in the n-cladding region of epitaxial material. Before growing the material, simulations were carried out to optimise the design. The lower optical confinement factor and higher gain saturation energy of three QWs based mode-locked lasers provide higher average and peak output power, reduced and symmetric far-field pattern, better radio frequency (RF) spectra, shorter optical pulses, and stable optimal mode-locking for a wide range of gain current and saturable absorber reverse voltage.

Waveguide structural effect on ripples of far-field pattern in 405-nm GaN-based laser diodes

2006 ◽  
Author(s):  
Sungmin Hwang ◽  
Jongin Shim ◽  
Hanyoul Ryu ◽  
Kyung-ho Ha ◽  
Junghye Chae ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Structural Effect ◽  
Field Pattern ◽  
Far Field ◽  
Far Field Pattern

Improvement of far-field pattern in nitride laser diodes

1999 ◽  
Vol 75 (19) ◽  
pp. 2960-2962 ◽  
Author(s):  
T. Takeuchi ◽  
T. Detchprohm ◽  
M. Iwaya ◽  
N. Hayashi ◽  
K. Isomura ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Field Pattern ◽  
Far Field ◽  
Far Field Pattern ◽  
Nitride Laser

Far-field pattern of laser diodes as function of the relative atmospheric humidity

1991 ◽  
Author(s):  
Jose C. A. Freitas ◽  
Fernando D. Carvalho ◽  
Fernando C. Rodrigues ◽  
Manuel A. Abreu ◽  
Joao P. S. Marcal
Keyword(s):  
Laser Diodes ◽  
Field Pattern ◽  
Far Field ◽  
Atmospheric Humidity ◽  
Far Field Pattern ◽  
Relative Atmospheric Humidity

Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers

2008 ◽  
Vol 104 (12) ◽  
pp. 124513 ◽  
Author(s):  
P. Gellie ◽  
W. Maineult ◽  
A. Andronico ◽  
G. Leo ◽  
C. Sirtori ◽  
...  
Keyword(s):  
Quantum Cascade Lasers ◽  
Transverse Mode ◽  
Field Pattern ◽  
Far Field ◽  
Mode Structure ◽  
Quantum Cascade ◽  
Metal Metal ◽  
Far Field Pattern ◽  
Cascade Lasers

Far-field patterns of line sources mounted between four-dielectric substrates

1992 ◽  
Vol 70 (2-3) ◽  
pp. 173-178 ◽  
Author(s):  
Ioanna Diamandi ◽  
Costas Mertzianidis ◽  
John N. Sahalos
Keyword(s):  
Remote Sensing ◽  
Line Source ◽  
Dielectric Substrate ◽  
Microstrip Antennas ◽  
Field Pattern ◽  
Substrate Thickness ◽  
Far Field ◽  
Dielectric Substrates ◽  
Field Patterns ◽  
Far Field Pattern

The far-field pattern characteristics of line sources lying between the slabs of a four-dielectric substrate configuration are presented. The patterns are calculated for several cases of the substrate thickness as well as for several line-source locations. The considerations that are made give useful applications in remote sensing and microstrip antennas.

scholarly journals Second harmonic generation from 3D nanoantennas: on the surface and bulk contributions by far-field pattern analysis

2011 ◽  
Vol 19 (27) ◽  
pp. 26752 ◽  
Author(s):  
Alessio Benedetti ◽  
Marco Centini ◽  
Mario Bertolotti ◽  
Concita Sibilia
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Pattern Analysis ◽  
Second Harmonic ◽  
Field Pattern ◽  
Far Field ◽  
Far Field Pattern

scholarly journals Scattering centers modeling of non-anechoic measurement environments

2012 ◽  
Vol 10 ◽  
pp. 69-73 ◽  
Author(s):  
K. A. Yinusa ◽  
C. H. Schmidt ◽  
T. F. Eibert
Keyword(s):  
Near Field ◽  
Field Measurements ◽  
Field Pattern ◽  
Far Field ◽  
Scattering Centers ◽  
Field Transformation ◽  
Field Radiation ◽  
Echo Suppression ◽  
Multipath Signals ◽  
Far Field Pattern

Abstract. Near-field measurements are established techniques to obtain the far-field radiation pattern of an Antenna Under Test via near-field measurements and subsequent near-field far-field transformation. For measurements acquired in echoic environments, additional post-processing is required to eliminate the effects of multipath signals in the resulting far-field pattern. One of such methods models the measurement environment as a multiple source scenario whereby the collected near-field data is attributed to the AUT and some scattering centers in the vicinity of the AUT. In this way, the contributions of the AUT at the probe can be separated from those of the disturbers during the near-field far-field transformation if the disturber locations are known. In this paper, we present ways of modeling the scattering centers on equivalent surfaces such that echo suppression is possible with only partial or no information about the geometry of the scatterers.

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