Low threshold laser emissions from dye-doped polymer films in photonic crystal cavity

Lan-Ting Shi; Feng Jin; Wei-Qiang Chen; Zhen-Sheng Zhao; Xuan-Ming Duan

doi:10.1117/12.859997

26 August 2010 Low threshold laser emissions from dye-doped polymer films in photonic crystal cavity

Lan-Ting Shi, Feng Jin, Wei-Qiang Chen, Zhen-Sheng Zhao, Xuan-Ming Duan

Proceedings Volume 7774, Linear and Nonlinear Optics of Organic Materials X; 77740V (2010) https://doi.org/10.1117/12.859997
Event: SPIE Photonic Devices + Applications, 2010, San Diego, California, United States

Abstract

In order to obtain high optical gain medium for low-threshold and compact polymeric lasers, a tert-butyl substitutional rhodamine B (t-Bu-RhB) was synthesized and doped in PMMA film. The optical properties were investigated and the results showed that the concentration of t-Bu-RhB in PMMA could be increased to 6.9 wt % without decrease of photoluminescence efficiency. Polystyrene (PS) PCs with bandgap of 595nm were fabricated by vertical-deposition method. Resonator cavity was constructed by sandwiching t-Bu RhB doped films with two PS PCs. When excited by a Nd:YAG laser beam(532nm,10Hz,8ns), single-mode laser emission was observed from the cavities with dye concentration of 3, 5, 6.9, 10 wt %. Lasing emission is located at 592nm, with the full-width at half-maximum (FWHM) of 1nm. Lasing threshold of the cavities dramatically decreased from 49.56 to 0.70 μJ/Pulse when the concentration of t-Bu RhB increased from 3 to 6.9 wt%. Through enhancing the dye concentration to decrease lasing threshold will save pump energy, which is not only important for economy of energy, but also in favor of extending the life of such laser devices.

Citation Download Citation

Lan-Ting Shi, Feng Jin, Wei-Qiang Chen, Zhen-Sheng Zhao, and Xuan-Ming Duan "Low threshold laser emissions from dye-doped polymer films in photonic crystal cavity", Proc. SPIE 7774, Linear and Nonlinear Optics of Organic Materials X, 77740V (26 August 2010); https://doi.org/10.1117/12.859997

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