Laser crystallization critical temperature

That the critical switch power is inversely proportional to the magnitude of thermo-optic coefficient dn/dT) was confirmed by experiment, and led to the choice of nematic phase liquid crystals as suitable, low absorption, spacer materials. Their high thermo-optic coefficient dn /dT — —2xl0 K at room temperature) produced all optical bistability at critical power levels of 140//W, allowing the demonstration of submilliwatt laser diode operation of these devices. 

In the vicinity of the phase transition temperature Tc, molecular correlations in liquid crystals give rise to interesting so-called pretransitional phenomena. This is manifested in the critical dependences of the laser-induced index change and the response time on the temperatiue. These critical dependences are described by... 

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