By changing pumping light for cholesteric liquid crystal based laser, the laser efficiency measurement of laser is done.
To gain laser of high power and high efficiency, some improvement measures are proposed and tested, such as align
treatment and temperature condition which also affects the wavelength of exit light. For the helical structures of
cholesteric liquid crystal and its temperature-tunable characteristics, the impact of temperature is also discussed.
We design a new kind of high birefringence photonic crystal fibers with square-lattice cladding.
Through changing the size of only four air holes in the x and y direction respectively, the birefringence is highly increased. It reaches to 1.643×10-3 when the wavelength is 1.8μm. Based on the finite element
method, the mode fields, dispersion and confinement loss of this kind of photonic crystal fibers are all analyzed.
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