scholarly journals A Polymer Film Dye Laser with Spatially Modulated Emission Controlled by Transversely Distributed Pumping

2016 ◽  
Vol 2016 ◽  
pp. 1-4
Author(s):  
Zurab V. Wardosanidze ◽  
Andro Chanishvili ◽  
Guram Chilaya
Keyword(s):  
Polymer Film ◽  
Interference Pattern ◽  
Light Field ◽  
Laser Emission ◽  
Second Harmonic ◽  
Spatial Modulation ◽  
Excitation Light ◽  
Dynamic Hologram ◽  
Coherent Beams ◽  
Laser Cell

Spatial modulation of laser emission controlled by the structure of excitation light field was demonstrated. A dye doped polymer film as an active medium was sandwiched between two laser mirrors forming a laser cell. The pumping was performed by an interference pattern formed with two mutually coherent beams of the second harmonic of a Q-switched Nd:YAG laser (532 nm) and located in the plane of the laser cell. The laser emission was observed normally on the plane of the cell. The cross section of the obtained laser emission was modulated in intensity with an interval between maximums depending on the period of the pumping interference pattern. Thus, the emitted light field qualitatively looks like diffraction from an elementary dynamic hologram, that is, a holographic diffraction grating.

Laser emission from transversely pumped dye-doped free-standing polymer film

2006 ◽  
Vol 8 (2) ◽  
pp. 189-193 ◽  
Author(s):  
K Geetha ◽  
M Rajesh ◽  
V P N Nampoori ◽  
C P G Vallabhan ◽  
P Radhakrishnan
Keyword(s):  
Polymer Film ◽  
Laser Emission ◽  
Free Standing

All-fiber maskless lithographic technology to form microcircular interference pattern on Azo polymer film

2005 ◽  
Author(s):  
Junki Kim ◽  
Yongmin Jung ◽  
Kyunghwan Oh ◽  
Chaemin Chun ◽  
Jeachul Hong ◽  
...  
Keyword(s):  
Polymer Film ◽  
Interference Pattern ◽  
Azo Polymer

Second-harmonic generation in an optically poled azo-dye/polymer film

2005 ◽  
Vol 123 (16) ◽  
pp. 164704 ◽  
Author(s):  
Yuxiao Wang ◽  
Oliver Y.-H. Tai ◽  
C. H. Wang
Keyword(s):  
Second Harmonic Generation ◽  
Polymer Film ◽  
Harmonic Generation ◽  
Azo Dye ◽  
Second Harmonic

scholarly journals A High Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 921 ◽  
Author(s):  
Min Fu ◽  
Changli Li ◽  
Ge Zhu ◽  
Hailin Shi ◽  
Fan Chen
Keyword(s):  
High Precision ◽  
Light Field ◽  
Light Transmission ◽  
Low Cost ◽  
Optimization Method ◽  
Spatial Modulation ◽  
Displacement Sensor ◽  
High Precision Measurement ◽  
Object Movement ◽  
Field Modulation

A new displacement sensor with light-field modulation, named as time grating, was proposed in this study. The purpose of this study was to reduce the reliance on high-precision measurements on high-precision manufacturing. The proposed sensor uses a light source to produce an alternative light-field simultaneously for four groups of sinusoidal light transmission surfaces. Using the four orthogonally alternative light-fields as the carrier to synthesize a traveling wave signal which makes the object movement in the spatial proportion to the signal phase shift in the time, the moving displacement of the object can be measured by counting time pulses. The influence of the light-field distribution on sensor measurement error was analyzed in detail. Aimed to reduce these influences, an optimization method that used continuous cosinusoidal light transmission surfaces with spatially symmetrical distribution was proposed, and the effectiveness of this method was verified with simulations and experiments. Experimental results demonstrated that the measurement accuracy reached 0.64 μm, within the range of 500 mm, with 0.6 mm pitch. Therefore, the light-field time grating can achieve high precision measurement with a low cost and submillimeter period sensing unit.

2D Spatial Modulation Instability in Second Harmonic Generation Scheme

2010 ◽  
Author(s):  
Michaël Delqué ◽  
Gil Fanjoux ◽  
Fabrice Devaux ◽  
Hervé Maillotte ◽  
Simon-Pierre Gorza ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Modulation Instability ◽  
Second Harmonic ◽  
Spatial Modulation
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