Hongbo Lu, Jian Xing, Cheng Wei, Jiangying Xia, Junqing Sha, Yunsheng Ding, Guobing Zhang, Kang Xie, Longzhen Qiu, Zhijia Hu. Band-gap-tailored random laser[J]. Photonics Research, 2018, 6(5): 390
- Photonics Research
- Vol. 6, Issue 5, 390 (2018)
Fig. 1. Schematic of the band-gap-tailored random laser.
Fig. 2. Chemical structures of chiral agent S811, infrared absorbing material PBIBDF-BT, and laser dye PM597.
Fig. 3. Experimental setup for the NIR controlling random laser.
Fig. 4. (a) DSC curves of CLC-based S811 (30 wt.%) in E7 (70 wt.%) at heating/cooling rate of 1°C per minute; (b) LC textures recorded under crossed polarizers for the sample at 26°C and 30°C.
Fig. 5. Transmission spectra of CLC as functions of (a) temperature and (b) irradiation time at 850 nm.
Fig. 6. Random lasing emission (a) for smectic A state at ∼ 0.35 mJ ∼ 3 μJ
Fig. 7. Random lasing spectra of LCs at the cholesteric state at different NIR (850-nm) irradiation times.
Fig. 8. Random laser wavelength changes with time (× *
Fig. 9. (a) Transmission spectra of CLC as a function of irradiation time of 940-nm NIR. (b) Bragg wavelength as a function of NIR irradiation time. (▪ 850-nm NIR irradiation on the sample; 
940-nm NIR irradiation on the sample.)
940-nm NIR irradiation on the sample.) Fig. 10. Stable random lasing wavelength for (a) different NIR irradiation wavelengths and (b) different concentrations of infrared absorbing material at 850 nm for 30 min.
Fig. 11. Stabilized wavelength of RLs changes with varying NIR irradiation power.
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