Theoretical modeling on the laser-induced phase deformation of liquid crystal optical phased shifter
- 84 Downloads
To improve the working condition of liquid crystal phase shifter on incident laser power, a theoretical model on laser induced phase distortion is built on the physics of heat deposition and heat transfer. Four typical factors (absorption, heat sink structure, cooling fluid rate, and substrate) are analyzed to evaluate the influence of phase distortion when a relative high-power laser is pumped into the liquid crystal phase shifter. Flow rate of cooling fluid and heat sink structure are the most important two factors on improving the limit of incident laser power. Meanwhile, silicon wafer is suggested to replace the back glass contacting the heat sink, because of its higher heat transfer coefficient. If the device is fabricated on the conditions that: the total absorption is 5% and it has a strong heat sink structure with a flow rate of 0.01 m/s, when the incident laser power is 110W, the laser-induced phase deformation on the center is diminished to be less than 0.06, and the maximum temperature increase on the center is less than 1K degree.
This work was supported by the National Science Foundation of China (NSFC) (nos. 61405029, 91438108, 61775026).
- 3.J.W. Dai, H.L. Peng, Y.P. Zhang et al., A beam-steering array using liquid crystal phase shifter[C]// IEEE Mtt-S International Microwave Workshop Series on Advanced Materials and Processes for Rf and Thz Applications. IEEE., 1–3 (2016)Google Scholar
- 5.P.F. Mcmanamon, P.J. Bos, M.J. Escuti et al., A review of phased array steering for narrow-band electrooptical systems [J]. Proc. IEEE 97(6), 1078–1096 (2009)Google Scholar
- 13.V.I. Brinzari, A.I. Cocemasov, D.L. Nika et al., Ultra-low thermal conductivity of nanogranular indium tin oxide films deposited by spray pyrolysis [J]. Appl. Phys. Lett., 110(7), (2017)Google Scholar
- 15.M. Piasecka, K. Strąk, B. Maciejewska, Calculations of flow boiling heat transfer in a minichannel based on liquid crystal and infrared thermography data [J]. Heat Transfer Eng., 38(3), (2017)Google Scholar
- 23.N. Wang, X.X. Li, The electrically controlled birefringence measurement influence of liquid crystal caused by absorption effect in infrared region[C]//Advanced Materials Research. Trans Tech Publ. 875, 467–471 (2014)Google Scholar
- 27.D.K. Yang, S.T. Wu, Fundamentals of liquid crystal devices[M]. Wiley (2014)Google Scholar