The design of Optical Limiters Based on the Formation of Bipolaron-Like Dications

1997 ◽  
Vol 479 ◽  
Author(s):  
Charles W. Spangler ◽  
Mingqian He
Keyword(s):  
Conjugated Polymers ◽  
Optical Power ◽  
Design Strategy ◽  
New Materials ◽  
Considerable Effort ◽  
Third Order ◽  
The Past ◽  
Optical Limiters ◽  
Optical Power Limiting ◽  
Absorption Characteristics

AbstractDuring the past decade, there has been considerable effort in the design of new materials with greatly enhanced nonlinear absorption characteristics. In recent years, it has been shown that incorporation of bipolaronic charges in the pi-electron sequence in conjugated polymers or copolymers leads to enhanced third-order nonlinear optical properties. In this current study a design strategy for the synthesis of optical power limiting copolymers is presented whose properties are based on the photogeneration of stable bipolaron-like dications.

Investigation of third-order nonlinear and optical power limiting properties of terphenyl derivatives

2014 ◽  
Vol 56 ◽  
pp. 425-429 ◽  
Author(s):  
Laxminarayana Kamath ◽  
K.B. Manjunatha ◽  
Seetharam Shettigar ◽  
G. Umesh ◽  
B. Narayana ◽  
...  
Keyword(s):  
Optical Power ◽  
Third Order ◽  
Optical Power Limiting

PICOSECOND OPTICAL LIMITING PERFORMANCE OF A NOVEL PPV-ZnPc CONJUGATED POLYMER

2000 ◽  
Vol 09 (03) ◽  
pp. 289-296 ◽  
Author(s):  
JINGJIN YU ◽  
LIMING WANG ◽  
QING WANG ◽  
MANKIT NG ◽  
LUPING YU
Keyword(s):  
Conjugated Polymers ◽  
Time Scale ◽  
Conjugated Polymer ◽  
Optical Power ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Picosecond Time Scale ◽  
Backbone Modification ◽  
Optical Power Limiting ◽  
532 Nm

A novel ZnPc monomer as well as PPV-ZnPc conjugated polymers have been synthesized and their optical power limiting (OPL) performances toward picosecond laser pulses at 532 nm have been measured. The comparison with the performance of C 60 under the same condition indicates that two of the compounds synthesized outperformed C 60 at picosecond time scale. It was found that conjugated PPV polymers containing a small amount of ZnPc cannot only preserve, but have also showed improvement over the monomer's OPL properties. It is believed that the backbone modification was responsible for the enhanced OPL performance.

New organic nonlinear optical materials: dithienylethylenes

2001 ◽  
Vol 708 ◽  
Author(s):  
B. Sahraoui ◽  
K.J. Pluciński ◽  
I. V. Kityk ◽  
B. Paci ◽  
P. Baldeck ◽  
...  
Keyword(s):  
Optical Materials ◽  
Optical Power ◽  
Laser Pulses ◽  
Visible Range ◽  
Nanosecond Laser ◽  
Wave Mixing ◽  
Third Order ◽  
Nanosecond Laser Pulses ◽  
Optical Power Limiting ◽  
532 Nm

ABSTRACTMeasurements of the third-order susceptibilities of new dithienylethylenes in solutions using a degenerate four wave mixing technique at λ=532 nm in picosecond regime were made. From these measurements we deduced the second order hyperpolarizabilities. Optical power limiting properties of the mentioned compounds using nanosecond laser pulses in the visible range are evaluated. The dispersion of nonlinear absorption coefficients is obtained. The appropriate quantum chemical calculations are carried out.

scholarly journals The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Thomas Vonk ◽  
Feng-Kun Guo ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Heavy Baryon ◽  
Power Counting ◽  
Flavor Symmetry ◽  
Chiral Perturbation ◽  
Third Order ◽  
Stellar Objects ◽  
The Past ◽  
Dense Nuclear Matter

Abstract In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral perturbation theory with SU(3) flavor symmetry and derive the axion coupling to the full SU(3) baryon octet, showing that the axion also significantly couples to hyperons. As studies on dense nuclear matter suggest the possible existence of hyperons in stellar objects such as neutron stars, our results should have phenomenological implications related to the so-called axion window.

Sign in / Sign up

Export Citation Format

Share Document