The Research On Dynamically Tuning The Resonance Wavelength Of ZnO Laser By Piezoelectric Polarization Effect

Since the advent of laser,the designing and forming wavelength-tunable laser has been the most vital task among the many,and such an effective way to expand the applicable range of laser.So far,a large proportion of the methods were used to achie Ve the goals of wavelength-tunable through bandgap tuning and cavity design.But no matter adjusting the material bandgap,or operating complex micro-nano fabrication on cavity,shall both be accordingly restricted by issues such as being hard to dynamically regulation,complicated technology and high le Vel of costs.In this paper,we chose Zn O,such material which is direct wide bandgap semiconductor,to work on.Posessing extremely high le Vel of exciton binding energy and easily obtaining a variety of micro-nano structure,the Zn O could be the significant alternative material for researching and application of ultraviolet laser de Vice.By utilizing the adavantage of the apparent piezoelectric properties caused by asymmetric structure,the phenomenon and internal mechanism of dynamically tuning the resonance wavelength of Zn O laser by piezoelectric polarization effect were discussed in detail in this paper.This paper mainly conducted high quality optical microcavity with two morphologies of Zn O microbelt and microrod through high temperature chemical vapor deposition,which were all appearing to be obtaining characateristics such as regular geometry and smooth surface.The result of laser performance testing has illustrated that: the threshold of a tested Zn O microbelt is around 2.6m W and cavity quality factor are about 6400;The threshold of a single Zn O microrod is around 7.1m W and cavity quality factor are about 11200.By establishing uniaxial strain applied system,this paper researched phenomena of resonance wavelength moving under different strain: under stretching strain,the wavelength of microbelt shift to bule,and microrod shift to red;while under compressing strain,the wavelength of microbelt shift to red,and microrod shift to bule.With deeper analysis,it is clear that the moving of resonance wavelength is the final result caused by the changing of cavity length and relative refractive index altogether,while the changing of the relative refractive index was heavily influenced by piezoelectric polarization effect.On the occasion of the stretching being applied on the [0001] crystal orientation of Zn O,relative refractive index would be enlarged and lead the resonance wavelength to redshift,while the compressing circumstance shall be the opposite.