Determination of internal parameters in blue InGaN laser diodes by the measurement of cavity-length dependent characteristics

2008 ◽  
Vol 93 (1) ◽  
pp. 011105 ◽  
Author(s):  
H. Y. Ryu ◽  
K. H. Ha ◽  
J. K. Son ◽  
S. N. Lee ◽  
H. S. Paek ◽  
...  
Keyword(s):  
Cavity Length ◽  
Laser Diodes ◽  
Internal Parameters

Determination of internal parameters for AlGaN-cladding-free m-plane InGaN/GaN laser diodes

2011 ◽  
Vol 99 (17) ◽  
pp. 171115 ◽  
Author(s):  
R. M. Farrell ◽  
D. A. Haeger ◽  
P. S. Hsu ◽  
K. Fujito ◽  
D. F. Feezell ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Internal Parameters

scholarly journals AOC-OPTICS: Automatic Online Classification for Condition Monitoring of Rolling Bearing

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 606
Author(s):  
Hassane Hotait ◽  
Xavier Chiementin ◽  
Lanto Rasolofondraibe
Keyword(s):  
Power Transmission ◽  
Rolling Bearing ◽  
Extraction Methods ◽  
Exponential Model ◽  
Essential Elements ◽  
Online Classification ◽  
Internal Parameters ◽  
Essential Components ◽  
Online Implementation

Bearings are essential components in rotating machines. They ensure the rotation and power transmission. So, these components are essential elements for industrial machines. Thus, real-time monitoring is required to detect a possible anomaly, diagnose the failure of rolling bearing and follow its evolution. This paper presents a methodology for automatic online implementation of fault diagnosis of rolling bearings, by AOC-OPTICS (automatic online classification monitoring based on ordering points to identify clustering structure, OPTICS). The algorithm consists of three phases namely: initialization, detection and follow-up. These phases use the combination of features extraction methods, smart ranking, features weighting and classification by the OPTICS method. Two methods have been integrated in the dimension reduction step to improve the efficiency of detection and the followed of the defect (relief method and t-distributed stochastic neighbor embedding method). Thus, the determination of the internal parameters of the OPTICS method is improved. A regression model and exponential model are used to track the fault. The analytical simulations discuss the influence of parameters automation. Experimental validation shows detection with 100% accuracy and regression models of monitoring reaching R 2 = 0.992 .

Longitudinal Modes in InAlGaAs/AlGaAs High-Power Laser Diodes

2004 ◽  
Vol 829 ◽  
Author(s):  
B. S. Passmore ◽  
Y. C. Chua ◽  
M. O. Manasreh ◽  
J. W. Tomm
Keyword(s):  
Cavity Length ◽  
Laser Diodes ◽  
Threshold Current ◽  
Stimulated Emission ◽  
High Power Laser ◽  
Power Laser ◽  
Longitudinal Modes ◽  
Direct Measurements ◽  
Infrared Spectrometer ◽  
Good Agreement

ABSTRACTThe emission from bias voltage driven In0.06Al0.08Ga0.86As/Al0.3Ga0.7As edge-emitting diode lasers with cavity lengths of 0.6 and 0.9 mm was measured at 290 K using a high resolution Fourier-transform infrared spectrometer. The light-current (L-I) characteristic curves showed that a threshold current of ∼ 0.5 and 0.8 A was needed to reach the stimulated emission in laser diodes with cavity lengths of 0.6 and 0.9 mm, respectively. The laser diode longitudinal modes were observed in the stimulated emission spectrum for each of the devices. These spectra enabled us to calculate the refractive index, total loss, and gain of the active region. On the other hand, the cavity length was determined by utilizing the interferogram spectrum, longitudinal modes spacing, and direct measurements of the laser dimensions. A good agreement between the cavity length values obtained from the three methods was achieved.

Catastrophic Optical-damage in High-power, Broad-area Laser-diodes

2009 ◽  
Vol 1195 ◽  
Author(s):  
Aland K. Chin ◽  
Rick K. Bertaska ◽  
Martin A. Jaspan ◽  
Allen M. Flusberg ◽  
Steve D. Swartz ◽  
...  
Keyword(s):  
Cavity Length ◽  
Ring Cavity ◽  
Laser Diodes ◽  
Optical Power ◽  
Transverse Mode ◽  
Broad Area ◽  
Optical Damage ◽  
Double Heterostructure ◽  
Transverse Modes ◽  
Optical Power Density

AbstractA detailed description of the phenomenon of catastrophic optical-damage (COD) in short (380μm cavity-length), 12μm aperture, proton-bombarded, double-heterostructure laser-diodes with uncoated facets was first presented in 1974. In these devices, COD generally initiates at the facets due to high optical-power density and propagate along transverse-mode filaments. To achieve reliable operation at high optical-power, broad-area laser-diodes have evolved to long (several-millimeter cavity-length), wide-aperture (50-200μm), dielectric-defined, broadened-waveguide, separate-confinement, double-heterostructure, quantum-well laser-diodes with coated, passivated facets. COD in these devices involve both transverse modes and ring-cavity modes.

scholarly journals Determination of cavity length of cavity-resonator-integrated guided-mode resonance filter

2015 ◽  
Vol 23 (3) ◽  
pp. 3020 ◽  
Author(s):  
Junichi Inoue ◽  
Tomohiro Kondo ◽  
Kenji Kintaka ◽  
Kenzo Nishio ◽  
Shogo Ura
Keyword(s):  
Cavity Length ◽  
Cavity Resonator ◽  
Guided Mode ◽  
Guided Mode Resonance

scholarly journals Short cavity InGaN-based laser diodes with cavity length below 300 μm

2019 ◽  
Vol 34 (8) ◽  
pp. 085005 ◽  
Author(s):  
Hezhi Zhang ◽  
Ching-Wen Shih ◽  
Denis Martin ◽  
Alexander Caut ◽  
Jean-François Carlin ◽  
...  
Keyword(s):  
Cavity Length ◽  
Laser Diodes
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