Laser Optics & Photonics

Shien-Kuei (Peter) Liaw received double doctorate degrees from National Chiao-Tung University in photonics engineering and from National Taiwan University in mechanical engineering. Prof. Liaw joined the National Taiwan University of Science and Technology (NTUST) in 2000. He has then been the Director of both the Optoelectronics Research Center and the Technology Transfer Center there. He was a visiting researcher at Bellcore (now Telcordia), USA in 1996 for six months and a visiting Professor at University of Oxford, UK for three months in 2011. rnHe has forty U.S./Taiwan/China patents and more than 250 journal articles and international conference presentations. He actively contributes to many conferences as technical program chair, international advisory committee and/or keynote speaker. Right now, Dr. Liaw is a distinguished Professor at National Taiwan University of Science and Technology, President of the Optical Society (OSA) in Taiwan Chapter and the Secretary-General of the Taiwan Photonic Society. rnrnrn

The aim of this paper is to enable solar energy (green energy) for designing the fiber-optic laser and amplifier. Collection of sunlight as the pump lasers are lunched into fiber laser and fiber amplifier, respectively. Fiber lasers and fiber amplifiers are designed based on solar pumping and various gained fibers. The operation wavelength of fiber devices is decided by the pumped wavelengths which we selected. For examples, the 980 nm solar pumped is for 1550 nm Erbium doped fiber devices as well as for 1064 nm Ytterbium doped fiber devices. To facilitate free space communication using solar pumped fiber amplifier and fiber lasers in the absence of electric power, especially during natural disasters, solar energy can be stored using a battery and which can be used to maintain an uninterruptible communication setup. To improve the pump slope efficiency, we designed a multi-input pumped power from different ports/positions to collect much more solar power. Parameters such as the pump slope efficiency, gain and noise figure for fiber amplifier or fiber laser are analyzed. The performance is tested in cloudy days, rainy days and sunny days for comparison. The fiber devices may be used for applications in uninterruptible fiber optic communication systems during disasters..

Khamchukov Yu.D. graduated from the Belarusian state university, an optics and spectroscopy in physical faculty. It has degree of the candidate of physical and mathematical sciences (PhD) in a chemical physics (N.N.Semenov Institute of Chemical Physics, Moscow, 1990) He was Head Laboratory Physical methods of research, Senior Researcher laboratory informational technologies and non-linear materials. He has published more than 56 papers in reputed journals, coauthor of three books monographs.

The polydomain structure of ferroelectric materials, the mobility of their orientation, the possibility of fixing it, ensures the existence of ways to control their macropolarization. Polydomain materials of this type predetermine the defectiveness of their crystal structure. These are, perhaps, orientation defects, whose existence for molecular crystals is very likely at room temperature\r\nThe stability of the properties of the ferroelectric phase of these materials also depends on the properties of elementary excitations: phonons and internal vibrations of molecular ions. Since the interpretation of the Raman spectra of triglycine sulfate (TGS) in the literature does not reflect the defectiveness of the crystal structure, and it has a significant effect on its properties, to determine the relationship between the macro and microproperties of such materials, it is necessary to determine the effect of defectiveness on their vibrational spectra. Therefore, the Raman spectra are recorded from the splitting of plates of triglycine sulfate monocrystals obtained by splitting. The registration of the Raman spectra was carried out with the Confotec NR500 microscope. For the excitation of Raman scattering, laser radiation with generation wavelengths of 532 and 632.8 nm was used. The power of the radiation focused on the sample was 3 mW. The optical signal was recorded from a site approximately 0.5 μm in diameter from the depth of the sample at a distance of 4 μm from the surface of the single crystal. All recorded spectra for the separation of overlapping bands were processed using the software package Origin 8.1. From the clarification of the existing interpretation of the Raman spectra, the presence of position-group splitting of the bands of degenerate sulphate-ion oscillations is determined, the absence of dynamic resonant interaction of the vibrations of ions of a primitive crystalline cell.