Here is the video of our demonstrations on the Open Public Day of IOP, CAS.
This lecture was divided into three parts: Firstly, I introduced the speaker to all, as you can see the details in Fig.1 in the poster; Secondly, the speaker gave the lecture; The third part is the audience to ask question about the experiment and exchange the ideas with the lecturer. PH.D candidate Bao-Qing Sun, who come from University of Glasgow, gave us a talk about the 3D computational ghost imaging, which already published in Science. He also reported some new experimental results in his recent works. During the lecture, people asked many questions, and the speaker answered all the questions very patient and clearly. After the lecture, the audience even asked more questions, and the meeting room full filled with voices of discussions. The lecture last two hours and the speaker and the listeners built the budding relationships with each other. A group photon was taken after the meeting to mark the occasion.
by Ming-Fei Li from IOP-OSA student chapter
24 Nov. 2013
On 14th Nov. 2013, the Institute of Physics (IOP)-Optical Society of America (OSA) Student Chapter was invited by Ms. Ji-Yun Ma, a teacher in the affiliated high school of Peking University, to give a lesson about optics. Under the sponsorship of OSA, we accepted the invitation and organized this education outreach activity.
Introduction of the Affiliated High School of Peking University (HSPKU)
The Affiliated High School of Peking University (HSPKU) was founded in 1960. It is located in the Zhongguancun High-Tech Zone. The School is a municipal key high school and a municipal model high school of Beijing and it is also an educational and teaching experimental base of basic education research and a training base of talent reserve for the Peking University. The School has also been honored as the Model School for the Scientific and Technological Extra-Curriculum Activities in the Elementary and High Schools in Beijing, the Base School for the Activities of the Adolescent Science and Technology Club, the National Advanced Basic Educational School with Physical Education Tradition and Beijing Municipal Green School. HSPKU is one of the best high schools in china.
As one of first schools opened to the world, the school started to enroll exchange students from foreign countries since 1960s. The school has attracted students from countries like the USA, UK, Japan, Korea and Cambodia, some of whom are children of head of states, social activists, scientists and person ages friendly to China. Until now the school has established friendly relationships with schools from over a dozen of countries and become an open school with extensive international connections.
The Scientific Popularized Class
We greatly cherished this opportunity not only because we were honored to be invited to give a class in such an excellent school, but also it was the first time to give a scientific popularized class to the high-school students. In the former education outreach activities, we only showed our experiments in some primary schools. Thus, the education outreach activity in the high school was a challenge for us. We spent two days to prepare some PPT slices and some new experimental equipments, such as the injector and plastic thin layer, to make sure everything would be fine.
There were fifteen students attending the class, who would continue their study abroad after graduating from high school. The class started with the experiment of dispersion of the light. The students were attracted by the beautiful colors of the artificial “rainbow” immediately. (In Fig. 1, the principle of dispersion phenomenon was shown by the PPT slice on the screen. The experiment – the colorful “rainbow” on the floor – was shown in Fig. 2.) When a white light LED flashlight was incident to the surface of the water in the cup with a special angle (about 3 degrees) from top to bottom, we could see several different colors of light from the other side. The students were surprised by the simple demonstration, and they never thought that the beautiful rainbow could be created so easily and they didn’t even notice about it in our daily life.
Fig.1 The dispersion of light
Fig.2 Dispersing light using water
The second experiment we did was to fill a transparent plastic cup with 80% of tap water, and mixed some drops of milk in it and stirred it with the milk straw. With a white LED flashlight incident to the solution, waves corresponding to blue color were scattered. A piece of paper was used to see the transmitted light which appeared yellow and red. With this demonstration, we could explain why the sky is blue and why the sunset and sunrise are red.
The scattering and the diffraction phenomena of light were also showed, in which the light source was exchange into red or green laser pointer. When the milk solution was illuminated by a red laser pointer and a green laser pointer simultaneously, the red light had a better capacity of penetration than that of the green light. We used this demonstration to explain why the red light is chosen to be a warning sigh in traffic lights.
The polarization phenomena of light were the most attractive demonstration. The students were excited to play with the plastic polarization plates. I told them to observe the screens of their portable electronics, such as laptop, ipad or cellphone, through the plates. When the plates were rotated to a special angle, the light intensity of the laptop screen almost attenuated to zero; however, the light of ipad or cellphone would not vanish. Then, I explained the physical origins of the polarization phenomenon to them, and that difference was due to the different alinements of the liquid crystals of the screens. Next, we talked about the 3D movie and 3D imaging techs, even discussed the question about what the difference between 3D and holography imaging was. Some of the students even asked me about the quantum nature of the photons. I was deeply touched by their curiosities arousing their passions to acquire the truth of the world.
Fig.5 The plastic polarization plates were used to check the laptop screen
Fig.6 Discussing the polarization phenomenon of light
The mystery of color was also showed. The red light shined into a cassette made by a shoe box, in which a green bag was laid, nobody could tell the true color of the bag because there was no green light reflected under the illumination of red light.
Fig. 7 What was its color?
Finally, we made a water lens with the thin plastics, a plastic cylinder and the injector, which was the new demonstration we learned from the 2013 OSA Leadership conference. Two thin plastics were jammed and fixed on the two sides of the cylinder. We injected water into the cylinder by the injector, which could change the curvature of the lens and change its focal length. At last the lens were made and used to watch the imaging phenomenon. They came around me, and we did this experiment together, as shown in Fig. 8.
Fig.8 Making the water lens
We showed the experiments about the phenomena of light, such as reflection, dispersion, scattering, diffraction, and illustrated some optical phenomena in our daily life. We also spent a very happy class that morning and we took a photograph together. Ms. Ma and the students showed great interests about our demonstrations and we were hopeful to establish long-term cooperation relations. I hope when they grow up, they can also become a member of OSA and pass on the knowledge and attract more people to the optical world, from one generation to another.
Fig.9 Group photo
We acknowledge OSA for the sponsorship and HSPKU for the support.
by Xiaogang Lu from IOP-OSA student chapter
5 December 2013
On 11th November 2013, the Institute of Physics, Chinese Academy of Sciences Student Chapter (IOP-OSA) held the third Lecturer Program successfully. Profession Donna T. Strickland, the current President of OSA from University of Waterloo, Canada, was invited to give a lecture in Institute of Physics, Chinese Academy of Sciences (IOP, CAS) and to participate in the academic exchange activities with the professors and the students of IOP-OSA. We were also pleased to meet Ms. Elizabeth Nolan, OSA Deputy Director and Chief Publishing Officer, and Ms. Kristin K. Mirabal, the Director of Research & Program Development from OSA.
Biography of the lecturer
Donna Strickland received her B. Eng. Degree in Physics, from McMaster University in 1981. She graduated from the University of Rochester in 1989 with a Ph.D. in Optics. Along with her Ph.D. supervisor, Dr. Gerard Mourou, Donna Strickland co-invented Chirped Pulse Amplification (CPA), which made it possible to amplify ultra-short pulses to unprecedented levels. From 1988 to 1991, Dr. Strickland was a research associate at the National Research Council of Canada. The following year, she was a physicist with the laser division of Lawrence Livermore National Laboratory. In 1992, she became a member of the technical staff of Princeton’s Advanced Technology Center for Photonics and Opto-electronic Materials. Dr. Strickland joined the physics department of the University of Waterloo as an assistant professor in 1997. At Waterloo, Dr. Strickland’s ultrafast laser group develops high-intensity laser systems for nonlinear optics investigations. She was promoted to Associate Professor in 2002 and since 2007 has been the Associate Chair of the Department. Dr. Strickland was selected as an Alfred P. Sloan Research Fellow in 1998. She received a Premier’s Research Excellence Award in1999 and a Cottrell Scholars Award from Research Corporation in 2000 and was named a Fellow of the Optical Society of America in 2008.
Dr. Strickland has worked on several committees within the OSA. She has been on the editorial board of OPN and she served as a topical editor for Optics Letters from 2004-2010. She has chaired the Archie McMahon and R.W. Wood Prize committees, served as FiO General Chair in 2012, as FiO Program co-chair in 2010, and she was on the program committee for the International Conference on Ultrafast Phenomena in 2002. Dr. Strickland was a member of the Member and Education Services Council (MES) from 2004 to 2006. She previously served on the OSA Board of Directors as a Director at Large from 2005-2007, and she sat on the Board’s Executive Committee during 2006-2007. From 2008-2011, she was the OSA-appointed representative to the International Commission for Optics (ICO) Board. Dr. Strickland is the 2013 OSA President.
Lecture title: Investigation of multi-frequency Raman generated spectra & Having fun helping in the OSA
Since the advent of lasers, many different nonlinear optical techniques have led to shorter, higher-intensity pulses. At Waterloo, we are studying multi-frequency Raman generation (MRG), which efficiently generates a large number of Raman orders spanning the spectral region from the infrared to the ultraviolet. If these Raman orders can be added in phase, the bandwidth is sufficient to generate ~2 fs pulses, with energy near 1mJ. While investigating the role of dispersion on increasing the overall spectra, we observed that the individual orders developed red shifted shoulders. In this talk, I will give an overview of the MRG process and discuss our experiments to determine the origin of the extra spectral peaks.
Fig.1 Prof. Strickland gave the lecture
Fig.3 Discussion after the lecture. The lecture was hosted by Prof. Kuijuan Jin
In order to appeal to more students to take part in the activity, we sent propaganda posters to all the branches of the OSA in every university in Beijing and Tianjin in advance. More than 50 people, including the teachers and students from Nankai University, Tsinghua University and Beijing University of Posts and Telecommunications took part in the activity. The Lecture was wonderful and many teachers and students expressed their keen interests. After the lecture, the audience asked and discussed questions actively.
After the lecture, we held a mini-seminar in the Meeting Room 255, Building M. Prof. Strickland, Ms. Elizabeth Nolan and Ms. Kristin K. Mirabal were invited to participate in and exchanged academic ideas with Professor Ling-An Wu and Dr. Yan Yin, the advisors of IOP-OSA, and 20 students from IOP,CAS, Nankai University, Tsinghua University and Beijing University of Posts and Telecommunications. Mingfei Li, the vice president of IOP-OSA, hosted the seminar and introduced the main activities of our chapter this year. Many valuable ideas and thoughts were raised by Prof. Strickland, the teachers and the students. During the seminar, all the students talked with Prof. Strickland, Ms. Elizabeth Nolan and Ms. Kristin K. Mirabal happily. The seminar brought us not only pleasure but also valuable experience.
Fig.6 Took the Group Photo
After the seminar, Prof. Strickland was accompanied to visit the Key Laboratory of Optical physics. We first visited the Ultrashort Pulse Laser and Quantum Frequency Standard Physics Laboratory of Group L07 and the Quantum Optics, which was introduced by Prof. Zhiyi Wei. Then, we visited Bose-Fermi Laboratory of Group Q01 of the Solid-State Quantum Information and Computation Laboratory and the Dr. Zhanchun Zuo described the lab in detail. Finally, Prof. Strickland and Prof. Zhiyi Wei carried on a thorough discussion at the dinner.
Fig. 7 Prof. Zhiyi Wei made explanations for Prof. Strickland
This lecturer program was not only a good opportunity for academic exchanges, but also a learning process for us. It has laid a good foundation for our further cooperation and we are looking forward to the next activity. What’s more, we hope that more students can join us and have more opportunities in learning and communication.
Many thanks for the sponsorship provided by the OSA and the great support from IOP, CAS.