تأثير تغيير دما در بازده انرژي ليزرهاي بلور مايع كلستريك

The effect of temperature change in energy efficiency of cholesteric liquid crystal lasers

تايپ چكيده

The laser emission at low energy threshold is investigated in a laser dye-doped cholestric liquid crystal (DDCLC) at long edge wavelength of the photonic band gap. After injecting DDCLC at the temperature of isotropic state into a flat and homogeneous cell with 10μm thickness, temperature reduction with the rate 0.3 °𝐶/𝑚𝑖𝑛 results in a defect-free single-domain cholesteric planar structure. The measurement reflects that the threshold energy and slope efficiency of the laser in this case and after the temperature fluctuation by ±20 °𝐶 around room temperature change from 0.20 μJ/pulse and 12% to 2.05 μJ/pulse and 7%, respectively.