فرمت فایل: پاورپوینت - ppt  

کتاب سبز - قابل ویرایش ) 

تعداد اسلاید : 19
Laser Cooling in Semiconductors Chengao Wang Optical Science and Engineering, Department of Physics & Astronomy, University of New Mexico Historical Review 1929: The concept of laser cooling was established. 1960: Laser was invented. 1995: Laser cooling was first observed in ytterbium-doped glass. ????: Laser cooling in semiconductors is achieved. Significance Heating is a major problem in semiconductor devices. Optical refrigerator using laser cooling will be free of vibration, mechanically robust and compact. It has far reaching implications in the area of optical detection systems and optoelectronic devices. Purpose invent a practical all-solid-state optical refrigerator to cool semiconductors using laser cooling. We hypothesize that laser cooling in semiconductors can achieve temperatures ~10K and below Overview of Methodology 1. Develop a comprehensive theoretical model of laser cooling in semiconductors. 2. Grow new semiconductor materials optimized for laser cooling using MOCVD 3. Demonstrate experimentally the theory of laser cooling in semiconductor devices. 4. Build prototype optical refrigerator in semiconductors. The concept of laser cooling The concept of laser cooling in semiconductors Step 1: Develop a comprehensive theoretical model of laser cooling in semiconductors. Luminescence Trapping Luminescence red-shift Step1: Deliverable Step 2: Use MOCVD to grow new semiconductor materials Step2: Deliverable Step 3: Demonstrate experimentally the theory of laser cooling in semiconductor devices Step3: Deliverable Step 4: Build prototype optical refrigerator in semiconductors. Step4: Deliverable The Goal: An All-Solid-State Cryocooler Thank you

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