Siam Physics Congress 2015

Session

Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena

14-OPT

21 May 2015, 08:00

33. Cuvette’s effect correction for practical light-scattering experiment

Somporn Buaprathoom (Mahidol Wittayanusorn School, 364 Moo 5 Salaya, Phutthamonthon, Nakorn Pathom, Thailand 73170)

21/05/2015, 08:00

Optics, Non-linear optics, Laser Physics, Ultrafast Phenomena

Oral presentation

Light scattering is a non-invasive technique to characterize small particles, such as microorganism and powder etc. Therefore, it is wildly used in many fields, for instance, pharmaceutical technology and microorganism detection. There are many authors theoretically calculate the scattered light from a particle for fitting to the experimental measurement to determine the particle...

273. Arc Discharge Drawing Silica Nanowires

Rattanachai Kowong (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Group (LANDOS), Science and Technology Institute, King Mongkut's University of Technology North Bangkok)

21/05/2015, 08:15

Optics, Non-linear optics, Laser Physics, Ultrafast Phenomena

Oral presentation

We propose a new approach, the Arc Discharge Drawing (ADD) technique, to fabricate silica fibers with diameters less than the wavelength of commercial available lasers. With this single-step technique, silica wires with diameters as small as 50 nm were demonstrated. This technique would provide an attractive alternative to current approaches to fabricate the silica nanowires. For...

266. An optical surface measurement for laser removal of graffiti

Mr Phumipat Kittiboonanan (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800 Thailand)

21/05/2015, 08:30

Optics, Non-linear optics, Laser Physics, Ultrafast Phenomena

Oral presentation

In this paper, we present the creation of a new class of an optical surface measurement based on laser scattering principle. This technique is aimed to serve as a non-destructive testing tool for laser removal of graffiti. The laser scattering system consists of a weak HeNe laser beam that is split into two arms, the reference arm and the sample arm. The reference arm serves as the unaffected...

275. The Development of Proving an Existence of Single Photon by Three Detectors

Mr Ratchanikorn Koomramyakul (Division of Physics, Mahidol Wittayanusorn School, Phutthamonthon, Nakhon Pathom 73170, Thailand)

21/05/2015, 08:45

Optics, Non-linear optics, Laser Physics, Ultrafast Phenomena

Oral presentation

The study of quantum optics in Mahidol Wittayanusorn School has established for four years. The latest study was conducted by attenuating blue laser and using the down-conversion crystal. The result of that study was a degree of second-order coherence = 0.412 ± 0.014 which violating the classical inequality. However that is not completely confirmed that single photon exists. The solid...

257. Measurement of linear thermal expansion by using fiber optic displacement sensor method

Mr Paradai Phanpanich (Department of Physics, Faculty of science, Mahidol university, 272 Rama 6 Road Ratchathewi Bangkok, 10400)

21/05/2015, 09:00

Optics, Non-linear optics, Laser Physics, Ultrafast Phenomena

Oral presentation

Fiber optic displacement sensor (FODS) is demonstrated to probe the linear thermal expansion of materials. The device employs an intensity modulation technique which is based on comparing the transmitted light intensity against that of the launch light to provide information on the displacement between the probe and the target. Steel and Aluminum were used as the target. From the thermal...