External feedback assisted reduction of the lasing threshold of a continuous wave random laser in a dye doped polymer film and demonstration of speckle free imaging

2021 ◽  
Vol 230 ◽  
pp. 117720
Author(s):  
Ashim Pramanik ◽  
Subrata Biswas ◽  
Partha Kumbhakar ◽  
Pathik Kumbhakar
Keyword(s):  
Polymer Film ◽  
Continuous Wave ◽  
Lasing Threshold ◽  
Random Laser ◽  
External Feedback ◽  
Doped Polymer

Study of Degenerate Four-Wave Mixing in Disperse Orange Dye-Doped Polymer Film

2012 ◽  
Vol 584 ◽  
pp. 526-530
Author(s):  
Shubhrajyotsna Aithal ◽  
P. Sreeramana Aithal ◽  
Gopalkrishna Bhat
Keyword(s):  
Polymer Film ◽  
Pump Beam ◽  
Continuous Wave ◽  
Phase Conjugation ◽  
Four Wave Mixing ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Wave Mixing ◽  
Degenerate Four Wave Mixing ◽  
Doped Polymer

Nonlinear optical phase conjugation by degenerate four-wave mixing (DFWM) is an important technique with applications in many fields of science and technology. Phase conjugation by Degenerate four-wave mixing is observed in Disperse Orange-25 dye doped in Polymethyl methacrylate – metacrylic acid (PMMA-MA) polymer film under low-power, continuous-wave laser irradiation. A maximum phase conjugate efficiency of 0.22% has been obtained for probe beam intensity at 0.11 W/cm2. Phase conjugation is observed for both parallel- and orthogonally-polarized probe and pump beams. The maximum PC reflectivity is achieved when the angle between probe and forward pump beam is 7 degrees. The effects of dye concentration, intensity of backward, forward pump and inter beam angle between probe and forward pump beam on phase conjugation reflectivity are also studied. PC signal strength first increases and then decreases. PC reflectivity is increased by increasing the intensity of the backward and forward pump beam. The polarization and intensity profile are verified to be preserved in the conjugate signal. The predominant phase conjugation signal is attributed to the facts that reverse saturable absorption and large third order susceptibility of the dye molecules.

Loss characterization in rhodamine 6G doped polymer film waveguide by side illumination fluorescence

2004 ◽  
Vol 6 (4) ◽  
pp. 379-383 ◽  
Author(s):  
K Geetha ◽  
M Rajesh ◽  
V P N Nampoori ◽  
C P G Vallabhan ◽  
P Radhakrishnan
Keyword(s):  
Polymer Film ◽  
Rhodamine 6G ◽  
Doped Polymer ◽  
Side Illumination

All-optical switching characteristics of ethyl red doped polymer film

2008 ◽  
Vol 30 (9) ◽  
pp. 1349-1354 ◽  
Author(s):  
Tang Xu ◽  
Guiying Chen ◽  
Chunping Zhang ◽  
Zhaofeng Hao ◽  
Xuxu Xu ◽  
...  
Keyword(s):  
Polymer Film ◽  
Optical Switching ◽  
All Optical ◽  
Switching Characteristics ◽  
Doped Polymer ◽  
All Optical Switching

Dynamic studies on laser-induced gratings in azobenzene-doped polymer film

1995 ◽  
Vol 61 (4) ◽  
pp. 377-384 ◽  
Author(s):  
J. Zhao ◽  
F. Dong ◽  
H. Qu ◽  
P. Ye ◽  
X. Fu ◽  
...  
Keyword(s):  
Polymer Film ◽  
Dynamic Studies ◽  
Doped Polymer

Polarization-Dependent Light-Gated Phase Conjugation in Methyl-Orange Doped Polymer Film

2002 ◽  
Vol 9 (4) ◽  
pp. 154-158
Author(s):  
Tsutomu Sato ◽  
Kazuo Nakagawa ◽  
Hirofumi Fujiwara
Keyword(s):  
Methyl Orange ◽  
Polymer Film ◽  
Phase Conjugation ◽  
Doped Polymer

Optical channel waveguides formed by upconverted photobleaching of dye-doped polymer film in regime of dark spatial soliton

1999 ◽  
Vol 161 (1-3) ◽  
pp. 132-140 ◽  
Author(s):  
Sergey Sarkisov ◽  
Michael Curley ◽  
Aaron Wilkosz ◽  
Vladimir Grymalsky
Keyword(s):  
Polymer Film ◽  
Spatial Soliton ◽  
Optical Channel ◽  
Channel Waveguides ◽  
Doped Polymer

Picosecond optical bistability in metallophthalocyanine-doped polymer film waveguides

1996 ◽  
Vol 21 (5) ◽  
pp. 357 ◽  
Author(s):  
Jinhai Si ◽  
Ling Qiu ◽  
Zhigang Cai ◽  
Jianying Zhou ◽  
Yuquan Shen ◽  
...  
Keyword(s):  
Polymer Film ◽  
Optical Bistability ◽  
Doped Polymer
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