Holographic Photoetching of High-Quality Diffraction Gratings in P-GaAs for Distributed Feedback Lasers

1986 ◽  
Vol 75 ◽  
Author(s):  
Richard Matz
Keyword(s):  
Uv Light ◽  
Incident Light ◽  
Diffraction Gratings ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
High Quality

AbstractQuarter micrometer period diffraction gratings having depth-to-spacing ratios around 0.5 have been photochemically etched in p-GaAs using direct holographic illumination with 257 nm UV light. The results suggest the interaction of the incident light with the etched grating. The etch process is represented with the aid of a potential-pH diagram calculated from literature data.

Holographic photoelectrochemical etching of diffraction gratings inn‐InP andn‐GaInAsP for distributed feedback lasers

1985 ◽  
Vol 57 (1) ◽  
pp. 39-44 ◽  
Author(s):  
R. M. Lum ◽  
A. M. Glass ◽  
F. W. Ostermayer ◽  
P. A. Kohl ◽  
A. A. Ballman ◽  
...  
Keyword(s):  
Diffraction Gratings ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
Photoelectrochemical Etching

scholarly journals Design of Tunable Holographic Liquid Crystalline Diffraction Gratings

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6789
Author(s):  
Katarzyna A. Rutkowska ◽  
Anna Kozanecka-Szmigiel
Keyword(s):  
Liquid Crystal ◽  
Communication Networks ◽  
Optical Communication ◽  
Liquid Crystalline ◽  
Incident Light ◽  
Diffraction Gratings ◽  
Lagrange Equations ◽  
Experimental Conditions ◽  
Molecular Distribution ◽  
Polarization Gratings

Tunable diffraction gratings and phase filters are important functional devices in optical communication and sensing systems. Polarization gratings, in particular, capable of redirecting an incident light beam completely into the first diffraction orders may be successfully fabricated in liquid crystalline cells assembled from substrates coated with uniform transparent electrodes and orienting layers that force a specific molecular distribution. In this work, the diffraction properties of liquid crystal (LC) cells characterized by a continually rotating cycloidal director pattern at the cell substrates and in the bulk, are studied theoretically by solving a relevant set of the Euler-Lagrange equations. The electric tunability of the gratings is analyzed by estimating the changes in liquid crystalline molecular distribution and thus in effective birefringence, as a function of external voltage. To the best of our knowledge, such detailed numerical calculations have not been presented so far for liquid crystal polarization gratings showing a cycloidal director pattern. Our theoretical predictions may be easily achieved in experimental conditions when exploiting, for example, photo-orienting material, to induce a permanent LC alignment with high spatial resolution. The proposed design may be for example, used as a tunable passband filter with adjustable bandwidths, thus allowing for potential applications in optical spectroscopy, optical communication networks, remote sensing and beyond.

High-power ridge-waveguide distributed-feedback lasers emitting at 860 nm

2002 ◽  
Vol 38 (25) ◽  
pp. 1676 ◽  
Author(s):  
H. Wenzel ◽  
M. Braun ◽  
J. Fricke ◽  
A. Klehr ◽  
A. Knauer ◽  
...  
Keyword(s):  
High Power ◽  
Ridge Waveguide ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers

High‐efficiency InGaAsP/InP flat‐surface buried heterostructure distributed feedback lasers at 1.55 μm

1987 ◽  
Vol 62 (5) ◽  
pp. 2153-2154 ◽  
Author(s):  
K. Wakao ◽  
K. Kihara ◽  
Y. Kotaki ◽  
T. Kusunoki ◽  
H. Sudo ◽  
...  
Keyword(s):  
High Efficiency ◽  
Flat Surface ◽  
Distributed Feedback ◽  
Distributed Feedback Lasers ◽  
Buried Heterostructure
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