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Complete Edited on 21 Photonics News VOLUME 10 ISSUE 01 FEBRUARY 2008 ANNUAL PHOTONICS WORKSHOP 2007 Inside this issue: In brief... The Annual Photonics His lecture was followed Workshop (APW- 2007) was by a lecture on From the editors desk 2 held during 27-28 February “Fluorescence Tech- 2007. The focal theme of the niques to probe New VC for CUSAT 2 Workshop was “Recent Trends Photonic Materials” by From ISP labs 3 in Nonlinear Optics”. The Prof. V Ramakrishnan Work shop was inaugurated by from Madurai Kamaraj Alumni column 6 the Vice Chancellor Dr. P K University. Prof. K Abdul Azis. About 40 partici- Porsezian from the Invited article 7 pants from various parts of the Pondicherry University We hear that…. 8 country participated in the spoke on “Nonlinear programme. Prof. V P N Nam- Properties of Optical Sound success 11 poori spoke on “Nonlinear Fibre”. “Fundamentals Lighting the innovation… optics and optical computing”. of Nonlinear Optics” Inaugural session of APW 2007 ISP-SPIE student 12 was introduced by Dr. N chapter column V Unnikrishnan, “Cavity QED”, and Dr. K G K War- rier from R.R.L, Thiruvananthapu- In the lime light 13 M.G.University. On the second day ram on “Mesoporous silica aerogels”. Recent publications 14 there were four lectures. In the evening the Science Day Lecture Commodore Nambiar of was delivered by Prof. V Unnikrish- Picture parlare 15 Indian Navy (retd.) gave nan Nair, Dean Faculty of Science, a lecture on “Lasers and CUSAT. There was one session for Applications”, Dr. T poster presentation. The event came Ramesh Babu, Physics to a close with Karnatic musical pro- Release of photonics news 07. Dept., CUSAT on gram and other cultural activities. Distinguished visitor Dr. Sajeev John , Department of properties and applications”. He is Physics , University of Toronto, the current holder of the C. V. Raman Canada. Raman Chair Professor. Chair Professorship of the Indian Academy of Sciences. as "photonic crystals". The Prof. Sajeev John delivered a ⇒ Released in basic concept was developed special lecture on “Photonic Band association with: in a series of papers by Pro- Gap Materials – Semiconductors of fessor John during 1980's. Dr. th Centre of Excellence Light” on 29 October 2007. The lec- Professor Sajeev Sajeev is the winner of the Insti- in About Lasers this and bulle- ture was sponsored by SPIE, The In- John is one of the world's Optoelectronic “engineering of ternational Society for Optical Engi- leading Condensed Matter the fundamen- Sciences, Photonics neering. Physicists whose work on tal properties of Society of India, electro mag- Photonic Band Gap (PBG) Localization of Light in ISP-SPIE student netic waves” materials are artificial, periodic, di- Random media similar to chapter & ISP-OSA electrics that enable engineering of the Anderson Localization of student chapter. tute of Electrical and Elec- most fundamental properties of elec- electrons has led to what is tronics Engineers (IEEE) tromagnetic waves. PBG materials known as Semi Conductors ⇒ For private LEOS International Quantum are of great practical importance for of Light or Photonic Band circulation only. Electronics Award in 2007 for all-optical communications, informa- Gap Materials. His name is “the invention and develop- tion processing, and the use of lasers synonymous with the field ment of light- trapping crys- in clinical medicine. that has come to be known tals and elucidation of their Cochin University of Science And Technology, Kochi, Kerala FROM THE EDITOR’S DESK . The year that was 2007.. The year two thou- five year integrated M.Sc. sor Lakshmanan, Professor sand seven was a period of (Photonics) students came Thanu Padmanabhan , Dr. hectic activities as far as out in July 2007. More than Rajaram Nithyananda and International School of ninety percent of the stu- Dr. Reji Philip covering Photonics and Centre of dents who have success- wide spectrum of topics Excellence in Lasers and fully completed the course like Astrophysics , Photonic Optoelectronics Sciences have joined prestigious in- crystals and Adaptive Op- were considered. At the stitutions for research in tics. outset let us welcome Dr. India and abroad. Some of The present issue of Gangan Prathap, who took them preferred research Photonics News is a chroni- charge as the Vice Chancel- programme over place- cle of various activities lor of Cochin University of ments in industries. Let us which took place in ISP and Science and Technology on congratulate the future CELOS. We take this op- 4th February 2008. Dr. photonians and wish them portunity to congratulate Prathap, a specialist in bright future. Mr. Jinesh Mathew whose Aerospace Engineering, is ISP and CELOS paper on humidity sensor a Bhatnagar Award Winner jointly with ISP-SPIE and figured in one of the most and has excellent academic ISP-OSA Student Chapters downloaded. achievements. Under the organized several pro- Let us thank all leadership of the new Vice gramme during 2007 and those who worked silently Chancellor, CUSAT will get they should be proud of behind the curtain to bring evolved into one among the arranging special lectures ISP and CELOS to the fore- top institutions of the by distinguished visitors front of the academic ac- angels are debating the best way to use it” ~Alan Valentine world. like Professor Ghatak , Pro- tivities in CUSAT. “Whenever science makes a discovery, the devil grabs it while The first batch of fessor Sajeev John , Profes- New Vice Chancellor for CUSAT 04/2008. Dr. Prathap was which was published from formerly scientist-in-charge, Holland. He is also mem- CSIR Centre for Mathemati- ber of the editorial boards cal Modelling and Com- of many scientific journals. puter Simulation, Banga- Dr. Prathap completed his lore. A winner of Bhatnagar schooling in Singapore and Award in 1990, Dr. Prathap took his B.Tech, in Aero- Editor-in-Chief belongs to Mayyanad in space Engineering with first Dr.Gangan Prathap Kollam. Sociologist Latha rank from IIT Madras in V. P. N. NAMPOORI Dr Gangan Prathap is the Sukumaran is his wife and 1974. He took his doctorate new Vice Chancellor of CU- their son Rahul is an engi- from IIT Madras in 1978. Editors SAT. Dr Gangan Prathap, a neer with L&T, Baroda. He was accorded fellow- renowned scientist, took Dr. Pratap has pub- ships by various research over as the new Vice- lished more than 300 re- institutions like Jawaharlal MATHEW . S Chancellor of the Cochin search papers, including the Nehru Centre for Advanced SREELEKHA . G University of Science and book “Finite Element in Scientific Research and In- Technology on February Structural Mechanics,” dian Academy of Science. SUDEESH . K page 2 photonics news 2008 Volume 10, Issue 01 from ISP labs Dyes modify thermal properties of clay The thermal dif- samples are also experi- evaluated by knowing the fusivity (TD) measure- mentally obtained. The transition frequency be- ments of montmorillonite sintered samples show a tween the thermally thin clays intercalated with the higher TD though they to thermally thick region cationic dyes like methyl- show similar trend as un- from the log–log plot of ene blue, malachite green sintered pellets. A varia- photo acoustic amplitude and auramine O, which tion in dye concentration versus chopping fre- are commonly used in the and sintering temperature quency. Analysis of the Photothermal process. textile industry, are car- can be used for tuning the data was carried out on ried out using photoacous- TD value of the clay to the the basis of the one- tic technique. The TD of desired level. (NHTEP dimensional model of dye adsorbed clays is ob- 2007 India, NLS-2007). The Rosencwaig and Gersho. served to change with laser induced non- The present investigation “The TD of variation in dye concentra- destructive photo acoustic reveals that amount of tion. The repeatedly ad- technique has been em- monomer has great influ- dye adsorbed sorbed samples show a ployed to measure the ence on the propagation of clays is lesser TD than the single thermal diffusivity of den- heat carriers and hence on adsorbed samples. The tal resin. The thermal the thermal diffusivity observed to TD values of the sintered diffusivity value was value. (ICIAS 2007, Malay- sia). change with variation in dye Raman study of polymer optic fibers concentration” Polymethyl methacry- length of the optical fibre its characterisation are being late (PMMA) optical fibres are is studied. Investigations studied . fabricated by preform drawing are carried out on the process. The Raman spectra of variation of FWHM of PMMA fibers are recorded us- Raman peak at 2957 cm-1 Polymer ing a diode pumped solid state with the length of the optical laser 532 nm and a CCD- optical fibre and at differ- fibre Spectrograph in the 400-3800 ent pump powers. The cm-1 range. The variation of the Fabrication of nanosilver Raman intensity with the doped polymer fibres and Laser Produced Plasma The laser induced ize the electrical signals formation by Laser Blow Off of breakdown study (LIBS) of generated by planar tar- thin flms under magnetic fields materials in transverse mag- gets forming plasma is using multiple diagnostics, in- netic fields and their emission also found to be suitable cluding ICCD imaging. Efforts behavior was the focal study of for studying plasma dy- have been made to reconstruct Image captured using ICCD our laser plasma group. Neu- namics in magnetic field. the emmissivity profiles of plas- tral species in plasma show a Presently, the mas interior through topog- strange response with splitting studies are being extended raphic techniques (pixel in the field and such multiple to a collaborative level and method). Digital interferomet- structures throw light into are being pursued at the ric method used in our lab for some of the complex process LD group of IPR, the in situ monitoring of the taking place in plasma.
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