Abstract
We report the design and fabrication of a wedge structured CLC film incorporating a spatial gradient of a chiral dopant concentration. A continuous spatial laser tuning in the broad visible spectral range with tuning resolution less than 1 nm is demonstrated, which renders a CLC-based micron-sized laser an important continuously tunable laser device.
Highlights
The chiral photonic bandgap properties of a cholesteric liquid crystal (CLC) originate from the self-organized helical arrangement of birefringent nematic mesogenes, which permits a formation of a polarization standing wave inside the CLC [1,2,3]
We report the design and fabrication of a wedge structured CLC film incorporating a spatial gradient of a chiral dopant concentration
A continuous spatial laser tuning in the broad visible spectral range with tuning resolution less than 1 nm is demonstrated, which renders a CLCbased micron-sized laser an important continuously tunable laser device
Summary
The chiral photonic bandgap properties of a cholesteric liquid crystal (CLC) originate from the self-organized helical arrangement of birefringent nematic mesogenes, which permits a formation of a polarization standing wave inside the CLC [1,2,3]. There is the possibility of tuning the laser emission wavelength through the influence of dye dopant concentration on the lasing wavelength [8,9] Another important scheme to attain spectral tunability has been to employ spatial tuning by scanning a tightly focused pumping beam across the CLC cell, possessing a built-in spatial gradient of a helical pitch. In our previous work [18], it has been shown that a continuous, non discrete, spatial tuning of laser emissions in the spectral range of 9nm can be attained in a wedge CLC cell prepared with a fixed concentration of the chiral dopant.
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