Surface-emitting photonic-crystal distributed-feedback laser for mid-infrared

• Main Authors: Chang, Bing -Hui, 張冰慧
• Other Authors: Lee, Chien-Ping
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/hmzy3u

碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 104 === Mid-infrared Surface-emitting photonic-crystal distributed-feedback lasers emitting at around 2.3m are reported in this thesis. The surface emission was obtained by using second order two-dimensional photonic crystal, formed by etched air holes in the semiconductor. The lasers were operated by optical pumping. Single mode operation at and above room temperature was achieved. Three different kinds of air hole shapes were used for the photonic crystal fabrication. The dependence of device performance on the air holes’ period geometry, etched depth and the filling factor were studied. Besides single wavelength lasers, we have also fabricated two-wavelength lasers using different periods for the etched holes along the X and the Y directions. The lasers were characterized at different temperatures. The characteristic temperature (T0) for the threshold shift and the temperature dependence of the emission wavelength were studied. As all DFB lasers, our lasers had very small temperature dependence on the wavelength. The polarization of the emitted light was also studied. For the single wavelength lasers, the polarization had no preferred orientation. But for the two wavelength lasers, two clear polarization orientations were clearly observed for the two different wavelengths. The mid-infrared surface emitting lasers are expected to be useful in many different applications, especially in environmental control such as gas sensing. In this thesis, the two wavelength surface emission at this wavelength was reported for the first time. I will provide additional flexibility for sensing applications.