On the Twyman effect and some of its applications

1985 ◽  
Vol 20 (1) ◽  
pp. 1-8 ◽  
Author(s):  
E. G. Nikolova
Keyword(s):  
Twyman Effect

scholarly journals Twyman effect in thin curved optics: effects of variable thickness and curvature

2021 ◽  
Vol 60 (6) ◽  
pp. 1780
Author(s):  
Sanjay N. Lakshmanan ◽  
John C. Lambropoulos
Keyword(s):  
Variable Thickness ◽  
Twyman Effect

The Twyman effect in plexiglass

1985 ◽  
Vol 4 (7) ◽  
pp. 888-889 ◽  
Author(s):  
E. G. Nikolova
Keyword(s):  
Twyman Effect

The Twyman effect in crystals of Bi4Ge3O12 and Bi12SiO20

1989 ◽  
Vol 8 (3) ◽  
pp. 309-310 ◽  
Author(s):  
E. G. Nikolova ◽  
M. M. Gospodinov
Keyword(s):  
Twyman Effect

Twyman effect mechanics in grinding and microgrinding

1996 ◽  
Vol 35 (28) ◽  
pp. 5704 ◽  
Author(s):  
John C. Lambropoulos ◽  
Su Xu ◽  
Tong Fang ◽  
Donald Golini
Keyword(s):  
Twyman Effect

Effects of N-Face Finishing on Geometry of Double-Side Polished GaN Substrate

2014 ◽  
Vol 8 (1) ◽  
pp. 121-127 ◽  
Author(s):  
Koji Koyama ◽  
◽  
Hideo Aida ◽  
Michio Uneda ◽  
Hidetoshi Takeda ◽  
...  
Keyword(s):  
Subsurface Damage ◽  
Mechanical Polishing ◽  
Cathode Luminescence ◽  
Twyman Effect

Difficulties involved in producing Double-Side Polished (DSP) GaN substrate are extracted and approaches to overcoming them are reported in this paper. Mechanical polishing with a neutral diamond slurry of pH 7.0 for the N-face and CMP for the Ga-face are widely applied to obtain DSP GaN substrates. Accordingly, the substrate exhibits transparency. However, this is accompanied by approximately 100 µm of bowing due to the Twyman effect. In this paper, the reduction of the substrate bowing to 10 µm is successfully achieved through the use of an acidic diamond slurry with a pH of 1.8 instead of a neutral slurry. Cathode luminescence reveals that an acidic diamond slurry also induces less subsurface damage in the N-face than does the neutral one. We conclude that the stress on the N-face induced by the subsurface damage in the case of polishing with an acidic diamond slurry comes closer to that of the Gaface finished via CMP.

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