https://scholars.lib.ntu.edu.tw/handle/123456789/31985
標題: | 自發型參數性下轉換的產生和量測 Create and Measure the Spontaneous Parametric Down Conversion |
作者: | 涂銘峰 Tu, Ming-Feng |
關鍵字: | 軌道角動量;光;相位匹配;參數振動;orbital angular momentum;light;phase matching;down conversion | 公開日期: | 2005 | 摘要: | We hope to verify the conservation of orbital angular momentum (OAM) of light under the spontaneous parametric down-conversion (SPDC) process. We use laser(with 355nm-wavelength) to pump a β − BaB2O4 (BBO) crystal. Because of the nonlinear property of the BBO crystal, the degenerate SPDC could happen in the crystal. Therefore, one 355nm photon would converted to two 710nm photons. We make use of the birefringence property of the BBO crystal to achieve beamlike Type II phase-matching. Under this phase-matching, it is efficient to collect the down-converted 710nm light. We plan to make the pump light carry the OAM with l = 0 or l = 1 by means of the hologram. On the other way, we use a new-reported method to measure the OAM of the down-converted 710nm light. And, making use of the coincidence-counting tool, we could verify the conservation of OAM of light. Under the SPDC process, the down-converted 710nm photon pairs are in the entangled state. Therefore, this experiment is related to the OAM of light and the entangled state which the quantum theory predicts. These two subjects are worthy of studying. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/54507 | 其他識別: | en-US |
顯示於: | 物理學系 |
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ntu-94-R92222034-1.pdf | 23.53 kB | Adobe PDF | 檢視/開啟 |
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