This paper combines the characteristics of optoelectronic technology with that of bilingual teaching. The course pays attention to integrating theory with practice, and cultivating learners' ability. Reform and exploration have been done in the fields of teaching materials, teaching content, teaching methods, etc. The concrete content mainly includes five parts: selecting teaching materials, establishing teaching syllabus, choosing suitable teaching method, making multimedia courseware and improving the test system, which can arouse students’ interest in their study and their autonomous learning ability to provide beneficial references for improving the quality of talents of optoelectronic bilingual courses.
The traditional experimental teaching methods have some shortcomings in the training the student innovation ability. In order to improve the student practical ability in the photoelectric technology, in this paper new experimental teaching modes are tried and reformed for cultivating the innovative ability of students in the linear CCD experiment. The photoelectric experiment systems are independently designed and completed by students. Compared with the traditional experimental teaching methods, this new methods have a great role in the development of the ability of creative thinking.
For short wavelength imaging systems，surface scattering effects is one of important factors degrading imaging performance. Study of non-intuitive surface scatter effects resulting from practical optical fabrication tolerances is a necessary work for optical performance evaluation of high resolution short wavelength imaging systems. In this paper, Soft X-ray optical scattering distribution is measured by a soft X-ray reflectometer installed by my lab, for different sample mirrors、wavelength and grazing angle. Then aim at space solar telescope, combining these scattered light distributions, and surface scattering numerical model of grazing incidence imaging system, PSF and encircled energy of optical system of space solar telescope are computed. We can conclude that surface scattering severely degrade imaging performance of grazing incidence systems through analysis and computation.
It is an important way to effectively improve applied optics experimental teaching effect and motivate the undergraduates’ practice ability and creativity by means of scientific and systematic setting teaching contents and link. Based on the research and analysis of applied optics experiment teaching present condition at home and abroad, this paper aims to solve the existed problems and deficiencies during the experiment teaching in our university, and also puts forward some reform ideas and practice method from several aspects such as teaching thought, teaching content and mode, examination and evaluation and so on. Simultaneously, this paper also gives some suggestions on the future course development.
Optical fiber sensor technology is one of the main contents of modern information technology, which has a very important position in modern science and technology. Fiber optic sensor experiment can improve students' enthusiasm and broaden their horizons in college physics experiment. In this paper the main structure and working principle of fiberoptical sensor with intensity compensation model are introduced. And thus fiber-optical sensor with intensity compensation model is applied to measure micro displacement of Young's modulus measurement experiment and metal linear expansion coefficient measurement experiment in the college physics experiment. Results indicate that the measurement accuracy of micro displacement is higher than that of the traditional methods using fiber-optical sensor with intensity compensation model. Meanwhile this measurement method makes the students understand on the optical fiber, sensor and nature of micro displacement measurement method and makes each experiment strengthen relationship and compatibility, which provides a new idea for the reform of experimental teaching.
This paper introduced the idea of teaching reformation of photoelectric information science and engineering specialty experiments. The teaching reformation of specialty experiments was analyzed from many aspects, such as construction of specialized laboratory, experimental methods, experiment content, experiment assessing mechanism, and so on. The teaching of specialty experiments was composed of four levels experiments: basic experiments, comprehensive and designing experiments, innovative research experiments and engineering experiments which are aiming at enterprise production. Scientific research achievements and advanced technology on photoelectric technology were brought into the teaching of specialty experiments, which will develop the students’ scientific research ability and make them to be the talent suitable for photoelectric industry.
At present, laser optical pumping magnetometer of sensitivity is continuous improved and can measure the
range from Earth magnetic field to the bio-magnetic field. In the bio-magnetic field, magnetocardiography (MCG) is
paid also more and more attention. In this paper, we will discuss cesium optically pumped magnetometer theoretical
analysis, system design, the magnetic field gradient measuring principle. On this basis, we build optically pumped
magnetometer in a gradient structure for the cardiac magnetic measurements and filter through the wavelet transform.
Based on optical pumping magnetometer measuring MCG will be applied in life science, clinical medicine and other fields.
Proc. SPIE. 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology
In the Λ three-level system, we will make use of semi-classical density matrix method to analyze cesium (Cs) hyperfine
structure of coherent population trapping (CPT) phenomenon. Coherent population trapping has been widely used in
electromagnetically induced transparency, non-inversion laser, optical storage and ultra-slow speed of light fields, then
strong-coupling light and weak detecting light form coherent laser light to change the hyperfine structure energy levels of
particles number distribution, which impacts on laser pumping magnetic resonance. In this paper, we will discuss the
theoretical analysis and system design of laser pumping cesium magnetometer, cesium atomic energy level formed
hyperfine structure with the <i>I-J</i> coupling, the hyperfine structure has been further split into Zeeman sublevels for the
effects of magnetic field. To use laser pump and RF magnetic field make electrons transition in the Zeeman sublevels to
produce the results of magneto-optical double resonance and on this basis we analyze the influence of laser pumping
magnetic resonance based on coherent population trapping.
Fluorescence fiber sensors are broadly used to measure temperature, concentration, and pH value etc.
The fluorescence sensing systems are based on different principles, namely fluorescence intensity,
fluorescence intensity ratio, and fluorescence lifetime. The fluorescence lifetime is an effective
parameter for sensing purpose, because it is independent on the intensity of the pumping source and
does not need expensive narrow-band filter. An experiment system has been established. Some samples
are produced to measured the fluorescence lifetime of temperature characteristic and get the
relationship of strain and temperature versus the fluorescence lifetime at the same time. The experiment
result was fitted and analyzed. The test results show that the fluorescence lifetime decreased with the
increasing of temperature. The change of fluorescence lifetime with the strain is inconspicuous
comparing to that with the temperature.
A novel method based on interferometry for measurement of fine surface roughness is proposed, designed and
completed. The polarization state of the optical beam in one path is changed utilizing a half wave-plate in this design,
avoiding the reversibility of the beam in similar systems previously reported, so that the stability of the system is
ensured. A quarter-wave plate is used to make the consistency of the polarization states of the coherent light to obtain the
better visibility. The absolute measurement values of the surface roughness are achieved using two concentrical beams
scanning the surface. The set-up is simple and easy to be realized. Experiment results show that roughness of
R<sub>a</sub>=0.012&mgr;m is achieved.
Rare-earth-element-doped fibers are wildly used in fiber amplifiers, fiber lasers and fiber sensors. Fiber Bragg Gratings (FBGs) are very important optical components in optical communication and sensing. The fluorescence fiber grating consists of fiber amplifiers and fiber gratings. Some fabrication methods of the fluorescence fiber grating are proposed in this paper. After pretreated, for example, Hydrogen loading, the rare-earth-elements-doped fibers become photosensitive fiber. The FBGs can be fabricated along the rare-earth-elements-doped fiber to form the fluorescence fiber gratings. When the pump light goes through the fluorescence fiber grating, the fluorescence light emits as incoherent signal. The power spectrum can be simulated based on an effective analysis method. In experiment, the fluorescence fiber gratings is fabricated to the Erbium doped fiber after Hydrogen loading. The power spectrum of these samples are obtained.
Rare-earth-element-doped fibers are wildly used in fiber amplifiers, fiber lasers and fiber sensors. Fiber Bragg Gratings (FBGs) are very important optical components in optical communication and sensing. Combining these two types of fiber products can give us a new type of fiber components, which is called fluorescence fiber grating here. The fluorescence fiber grating consists of fiber amplifiers and fiber gratings. It has serials of special characters. The method to fabricate the fluorescence fiber grating is writing the grating configuration to a rare-earth-elements-doped fiber. Normally, these fibers need pretreatment, for example, loading hydrogen. Differing to a fiber laser, the fluorescence fiber grating has a whole-length grating configuration along the rare-earth-elements-doped fiber. The emission of the fluorescence signal will occur along the whole components. There are no a clear fluorescence light source and clear reflection areas. When the pump light goes through the fluorescence fiber grating, the fluorescence light emits as incoherent signal. The intensity of the output light from the ends of the grating is the sum of the light intensity from the all parts of the fluorescence fiber grating. The coupling mode theory is used to explain the character of the fluorescence fiber gratings. The fluorescence light emitting from a part of the fluorescence fiber grating will be reflected by double sides of the grating. Then the sum of light intensity from the every part will give the spectrum of the output light. The shape of the spectrum of the output light depends on both the length and the modulation depth of the grating.