Abstract：The need of understanding and teaching about wave-particle duality if light with gets more and more apparent in the background of the attention of modern physics. As early as the beginning of twentieth Century, Einstein dared to "deny" the development of a very perfect light electromagnetic theory, so that the quantum of light can be developed. In 1924, De Broglie put forward wave-particle duality if light to other micro particles and the concept of matter wave, pointed out that all micro particle has wave-particle duality. This is a very abstract concept for students, most college physics teaching all lack of demonstration about particle duality of light. The present article aims to contribute to demonstrate the wave-particle duality of light at the same time using a simple way based on fiber optical tweezers. It is hoped that useful lesson can be absorbed so that students can deepen the understanding of the particle and wave properties of light. To complement the demonstration experiment for this attribute light has momentum.

University physics is an important public basic course for science and engineering universities. It has the irreplaceable role compare with other courses in improving students' scientific literacy and ability to analyze and solve problems, coordination theory knowledge and improving students' practical ability. Previous teaching had "attention to theory, despise application", "attention to model, despise deduction" misunderstanding. At the same time college entrance examination curriculum makes diversified physical knowledge system for education groups. This paper explores a new effective teaching mode. First analysis of the University Physics Teaching, then discussed the diversified teaching mode based on the university physics teaching objectives.

Erbium doped fiber is a main component of Erbium Doped Fiber Amplifiers (EDFAs), which is wildly used in optical communication. Erbium doped fiber is a good sensing material of fluorescence temperature sensors as well. The Erbium-doped-fiber temperature sensors can operate under high temperature up to 1 100 °C.Fluorescence sensors show considerable promise, with the advantage of being intensity independent. Following the termination of a square excitation light pulse, the fluorescence signal is an exponential decay, which decay lifetime depends on the temperature and can be measured by several methods. The decay acquisition and estimation methods are one kind of them. Different arithmetic is developed such as the Marquardt method, the Prony method and the log-fit method.A new estimation method is given in this paper, basing on the FFT (Fast Fourier Transform) and the Taylor series. The fluorescence lifetime can be calculated from the items of the FF1' with different accuracy. This method is especially designed for the long-fluorescence-lifetime system, for example, Erbium-doped-fiber sensing system with lifetime up to lOms. However this method can be used for other fluorescence material also with a little shift. The advantages of this method include high accuracy, quick processing, independence on base offset etc.The effect of this method is discussed and compared with other estimation methods by numerical simulation and experiment results.

Abstract：The Michelson interferometer is a very important instrument in optical part for college physics teaching. But most students only know the instrument itself and don't know how to use it in practical engineering problems. A case about optical fiber white light interference based on engineering practice was introduced in the optical teaching of college physics and then designed a development course of university physical optics part. This system based on low-coherence white light interferometric technology can be used to measure distribution strain or temperature. It also could be used in the case of temperature compensation mode.This teaching design can use the knowledge transfer rule to enable students to apply the basic knowledge in the university physics to the new knowledge domain, which can promote the students' ability of using scientific methods to solve complex engineering problems.

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