| Autor: |
M. P. De Santo, Guram Chilaya, Riccardo Barberi, Andro Chanishvili, Gia Petriashvili, H. Sellame, Mario Ariosto Matranga, Gabriella Cipparrone, Alfredo Mazzulla |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.742910 |
| Popis: |
We have investigated defect mode lasing when a cell containing a dye solution is sandwiched between two cholestericliquid crystal cells. When the cholesteric pitch of both cells is equal, the dye emission generates the typical multi-modelasing peaks inside the photonic stop band. We prepared two cholesteric mixtures whose pitches were shifted one respectto the other in such a way that only the edges of band gaps of the cholesteric liquid crystals layers overlapped. Usingthese mixtures we have observed single mode lasing. Moreover the divergence of the laser beam spot is considerablylower than the one observed in dye doped cholesteric liquid crystal lasers.Keywords: cholesteric liquid crystal, photonic band gap, lasing. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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