scholarly journals Operating Characteristics of High-Order Distributed Feedback Polymer Lasers

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 258 ◽  
Author(s):  
Puxi Zhou ◽  
Lianze Niu ◽  
Anwer Hayat ◽  
Fengzhao Cao ◽  
Tianrui Zhai ◽  
...  
Keyword(s):  
Slope Efficiency ◽  
Structural Parameters ◽  
Groove Depth ◽  
High Order ◽  
Distributed Feedback ◽  
Interference Lithography ◽  
Operating Characteristics ◽  
Multiple Wavelength ◽  
Low Threshold ◽  
Manufacturing Tolerances

In this study, high-order distributed-feedback (DFB) polymer lasers were comparatively investigated. Their performance relies on multiple lasing directions and their advantages include their high manufacturing tolerances due to the large grating periods. Nine laser cavities were fabricated by spin-coating the gain polymer films onto a grating structure, which was manufactured via interference lithography that operated at the 2nd, 3rd, and 4th DFB orders. Low threshold lasing and high slope efficiency were achieved in high-order DFB polymer lasers due to the large grating groove depth and the large gain layer thickness. A high-order DFB configuration shows possible advantages, including the ability to control the lasing direction and to achieve multiple-wavelength lasers. Furthermore, our investigation demonstrates that the increase in threshold and decrease in slope efficiency with an increase in the feedback order can be limited by controlling the structural parameters.

Low-threshold multiple-wavelength vertical-cavity laser arrays obtained by postgrowth wet oxidation

1998 ◽  
Vol 34 (19) ◽  
pp. 1857 ◽  
Author(s):  
A. Fiore ◽  
Y.A. Akulova ◽  
J. Ko ◽  
E.R. Hegblom ◽  
L.A. Coldren
Keyword(s):  
Wet Oxidation ◽  
Laser Arrays ◽  
Multiple Wavelength ◽  
Low Threshold ◽  
Cavity Laser ◽  
Vertical Cavity

980 nm high power, high slope efficiency distributed feedback lasers with nonabsorbing mirrors

1998 ◽  
Vol 34 (17) ◽  
pp. 1663 ◽  
Author(s):  
R.M. Lammert ◽  
J.E. Ungar ◽  
S.W. Oh ◽  
H. Qi ◽  
J.S. Chen ◽  
...  
Keyword(s):  
High Power ◽  
Slope Efficiency ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
High Slope

Theoretical study of micro-structure fabrication by multi-beam laser interference lithography with different polarization combinations

2021 ◽  
pp. 2150459
Author(s):  
Xiangxian Wang ◽  
Tianxu Jia ◽  
Jiankai Zhu ◽  
Yingwen Su ◽  
Liping Zhang ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Structural Parameters ◽  
Interference Lithography ◽  
Polarization Angle ◽  
Laser Interference Lithography ◽  
Laser Interference ◽  
Micro Structure ◽  
Periodic Patterns ◽  
Beam Laser ◽  
Micro Structures

In this study, we systematically and comprehensively investigated the influence of polarization angle on the fabrication of micro-structures by multi-beam laser interference lithography. Using theoretical analysis and simulation, we studied the effect of different polarization combinations, i.e. transverse electric (TE) and transverse magnetic (TM) polarization combinations, on the characteristics of the micro-structures fabricated by three-, four-, and six-beam laser interference lithography. We successfully obtained micro-structures with different periodic patterns such as honeycomb dots, quasi-elliptic dots, different square dots, and quasi-triangular dots. The simulation results illustrate that polarization affects the formation of interference patterns, pattern contrasts, and periods. The methods discussed herein are simple, low cost, and allow excellent control over structural parameters, and hence are useful for the micro-structure manufacturing industry.

Influence of micro-grooves on the lubrication performance of a misaligned bearing

2019 ◽  
Vol 234 (6) ◽  
pp. 887-899
Author(s):  
Yanxiang Han ◽  
Yonghong Fu
Keyword(s):  
Angular Position ◽  
Surface Texturing ◽  
Mass Conservation ◽  
Groove Depth ◽  
Film Rupture ◽  
Practical Applications ◽  
Numerical Predictions ◽  
Lubrication Performance ◽  
Load Carrying ◽  
Manufacturing Tolerances

Surface texturing for improving the lubrication performance of journal bearings has been widely investigated in the last two decades. In practical applications, the misalignment of a journal bearing occurs due to the asymmetric bearing load, elastic deflection, manufacturing tolerances, and installation errors. However, there has been little discussion on the influence of grooves on the lubrication performance of misaligned bearings. In the present work, numerical predictions of lubrication performances are presented to test the influence of the grooves. Based on the JFO boundary condition, a mass conservation algorithm is implemented to automatically determine the position of oil film rupture and reformation. The load-carrying capacity, friction force, friction coefficient, and bearing moment are computed numerically. The influence of angular position of the groove is first conducted in a misaligned bearing. Subsequently, the groove depth and width are investigated with different values of [Formula: see text] and [Formula: see text] ratios, respectively.

Low threshold current AlGaAs/GaAs distributed feedback laser grown by two‐step molecular beam epitaxy

1985 ◽  
Vol 47 (6) ◽  
pp. 570-572 ◽  
Author(s):  
Keisuke Kojima ◽  
Susumu Noda ◽  
Kazumasa Mitsunaga ◽  
Kazuo Kyuma ◽  
Takashi Nakayama
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Threshold Current ◽  
Distributed Feedback ◽  
Distributed Feedback Laser ◽  
Low Threshold

scholarly journals Low threshold edge emitting polymer distributed feedback laser based on a square lattice

2005 ◽  
Vol 86 (16) ◽  
pp. 161102 ◽  
Author(s):  
A. E. Vasdekis ◽  
G. A. Turnbull ◽  
I. D. W. Samuel ◽  
P. Andrew ◽  
W. L. Barnes
Keyword(s):  
Distributed Feedback ◽  
Square Lattice ◽  
Distributed Feedback Laser ◽  
Low Threshold
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