Stabilizing The Laser Wavelength Based On The Symmetrical Metal-cladding Waveguide

Recently, it was demonstrated that the double metal-cladding optical waveguide isextremely sensitive to optical parameters (e.g. refractive index) of the guiding layer and canachieve a1.5mm giant Goos-H nchen (GH) shift. These properties have already been used todevelop the biochemical sensors with high sensitivity. Moreover, our recent experimentsrevealed that the incident light intensity can be enlarged as much as two orders in the doublemetal-cladding optical waveguide. Based on the high sensitivity, light enhancement effect andthe giant GH shift, a method for stabilizing the laser wavelength with high sensitivity isproposed. Based on the enhanced GH shift and its sensitivity characteristic, the applicationresearch on four differential fields are systematically described in this dissertation.1. A wavelength locking method,which can avoid the errors resulted from the fluctuationof laser intensity and greatly enhanced the stability of wavelength locking,is theoreticallyanalyzed based on the differential signal of the light intensity and the high sensitivity of theultrahigh-order mode responding to a slight variation of wavelength in the symmetricalmetal-cladding waveguide. A pm wavelength locking is archived and the fabrication processof device is very simple.2. Based on the differential signal in the Goos-H nchen shift, a method for stabilizing thelaser wavelength with high sensitivity is proposed. In the symmetrical metal-claddingwaveguide, the Goos-H nchen is largely enhanced and highly responds to the variation in thewavelength of incident light. Since the measurement of the Goos-H nchen shift is immune tothe intensity fluctuation in laser source, the wavelength shift down to0.1pm can be detectedin our method. The proposed device could have potential applications in the opticalcommutation system.