Investigation on the output energy characteristic of optical limiting based on stimulated Brillouin scattering

2008 ◽  
Vol 92 (4) ◽  
pp. 599-602 ◽  
Author(s):  
W. L. J. Hasi ◽  
Z. W. Lu ◽  
S. Gong ◽  
D. Y. Lin ◽  
W. M. He ◽  
...  
2010 ◽  
Vol 28 (1) ◽  
pp. 179-184 ◽  
Author(s):  
W. Gao ◽  
Z.W. Lu ◽  
S.Y. Wang ◽  
W.M. He ◽  
W.L.J. Hasi

AbstractA new approach to measure stimulated Brillouin scattering threshold based on the output energy characteristic of stimulated Brillouin scattering optical limiting is proposed. The stimulated Brillouin scattering threshold or its exponential gain, Gth, can be accurately and conveniently determined by the intersection point of linear-fitting lines of the output energy below and above the threshold. The values of Gth in CS2 and FC-72 for different wavelengths and interaction lengths are measured in Continuum's Nd:YAG Q-switched laser and its frequency-doubled system. We show that Gth for transient regime is larger than that for steady state, and increases with the pump wavelength and the interaction length.


2009 ◽  
Vol 95 (4) ◽  
pp. 711-714 ◽  
Author(s):  
W. L. J. Hasi ◽  
Z. W. Lu ◽  
M. L. Fu ◽  
H. H. Lu ◽  
S. Gong ◽  
...  

2009 ◽  
Vol 27 (3) ◽  
pp. 533-536 ◽  
Author(s):  
W.L.J. Hasi ◽  
Z.W. Lu ◽  
M.L. Fu ◽  
H.H. Lu ◽  
S. Gong ◽  
...  

AbstractIn order to improve the optical limiting performance based on stimulated Brillouin scattering (SBS), a combination of SBS and carbon nanotube/HT-270 suspension for optical limiting is proposed in this paper. The dependence of output energy of optical limiting based on this hybrid approach on the pump energy is numerically simulated, and validated in Continuum's Nd: YAG seed-injected laser. The results indicate that the output energy based on this hybrid approach shows much better performance compared with that based on single SBS. In this approach, the SBS threshold can be controlled by adjusting the gain coefficient of medium and focal length of the lens, and the threshold of suspension can be controlled by altering the concentration and focal length of the lens, therefore, this hybrid approach to realize optical limiting has great potential in practical application.


2011 ◽  
Vol 30 (1) ◽  
pp. 17-21 ◽  
Author(s):  
X.Z. Geng ◽  
W.L.J. Hasi ◽  
C.Y. Jin ◽  
D.Y. Lin ◽  
W.M. He ◽  
...  

AbstractIn this paper, a scheme of compound optical limiting based on nonlinear material dissolved into Brillouin medium is proposed. Both nonlinear material and Brillouin medium used as the solvent play roles of optical limiting, so the proposed optical limiting scheme presents a lower output clamp value and flatter output energy compared with the single stimulated Brillouin scattering (SBS). Compound optical limiting of F16PCCu/acetone is prepared and output energy characteristic based on it is studied in this paper. Both the theoretical and experimental results indicate that the output clamp value and output energy based on the compound method is lower and flatter than that based on single SBS optical limiting. Some properties of the compound optical limiting, such as limiting energy range, limiting waveband, response speed, limiting threshold and damage threshold, also are analyzed and discussed in the later part of this paper.


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