Реверсивне фотоперестроювання частоти лазерної генерації в домішковому холестеричному рідкому кристалі
We have implemented a new method of phototuning of the lasing frequency of dye-doped cholesteric liquid crystals (CLCs) fabricated on the basis of mixtures of the azoxy nematic ZhK-440 and cholesterol derivatives. The essence of the method consists inchanging the helix pitch at the irradiation of a...
Збережено в:
| Дата: | 2022 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | Ukrainian English |
| Опубліковано: |
Publishing house "Academperiodika"
2022
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| Теми: | |
| Онлайн доступ: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2022100 |
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| Назва журналу: | Ukrainian Journal of Physics |
Репозитарії
Ukrainian Journal of Physics| Резюме: | We have implemented a new method of phototuning of the lasing frequency of dye-doped cholesteric liquid crystals (CLCs) fabricated on the basis of mixtures of the azoxy nematic ZhK-440 and cholesterol derivatives. The essence of the method consists inchanging the helix pitch at the irradiation of a CLC with light of different wavelengths. For the majority of lasing dyes, the quantumyield of the fluorescence in such materials is found to sharply decrease at weight concentrations of 0.3–0.5%, which interferes with lasing in them. A dye of the pyrromethene class which provides a quantum yield of the fluorescence of more than 50% at the indicated concentrations is discovered. The lasing in an CLC on the basis of azoxy nematic ZhK-440 has been obtained, and the reversible phototuning by 30 nm toward shorter and by 20 nm toward longer wavelengths has been carried out. |
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