پاورپوینت خنک کننده لیزری در نیمه هادی ها

دانلود پاورپوینت با موضوع پاورپوینت خنک کننده لیزری در نیمه هادی ها دارای 19 اسلاید و با فرمت .ppt و قابل ویرایش و آماده برای ارائه ، چاپ ، تحقیق و کنفرانس می باشد.

 

تعداد اسلاید : 19 اسلاید
فرمت فایل: پاورپوینت .ppt و قابل ویرایش
آماده برای : ارائه ، چاپ ، تحقیق و کنفرانس

قسمتی از متن نمونه:

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.
Two key issues, luminescence trapping and red-shifting, have not been addressed in the current theory and these issues will frustrate our attempts to achieve semiconductor net cooling
Luminescence Trapping
Total internal reflection
Luminescence red-shift
....