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Abstract
A semiconductor diode laser current controller is described for room temperature operation. A current limiting circuit has been introduced in the controller to avoid the breakdown of the diode laser at high current. The diode current can be modulated for frequency modulation of the source and can be tuned over small wavelength ranges. Using the controller the absorption of the weak overtone band transitions of C2 H2 around 788 nm have been observed using the lock-in detection technique with a path length of only 1.5m.
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Notes on contributors
A Ray
Ayan Ray, born on 1975 in Calcutta, completed his MSc in Physics in 1999 from the Calcutta University. Presently he is working as a research fellow in Calcutta University under Professor P N Ghosh on Laser Physics.
S De
Sankar De, born in 1975 in Calcutta, completed his MSc in Physics in 1999 from the Calcutta University. Presently he is working as a research fellow in Calcutta University under Professor P N Ghosh on Laser Physics. He is also associated with a research program at Nuclear Science Centre, New Delhi, on Molecular Fragmentation by Ion Imapct.
B Ray
Bishwajit Ray, born in 1970 in Burdwan (WB). completed his MSc in Physics in 1993 from the Calcutta University. He obtained his PhD degree in Physics (Experimental) in the year 1998 from the University of Calcutta. Presently he is working as a Lecturer in Physics in N D College. Howrah. Dr Ray has, to his credit, nine research publications in Journals and more than ten publication in Conference/Seminar proceedings. He is a life member of Indian Physics Association and Laser and Spectroscopic Society of India. He has visited University of Konstanz. Germany, for post doctoral work in laser cooling and trapping experiment.
D Biswas
Debasish Biswas, born in 1969 in Calcutta, completed his MSc in Physics in 1992 from the Calcutta University. He obtained his PhD degree in Physics (Experimental) in the year 1999 from the University of Calcutta.
Presently he is working as a CSIR Senior Research Fellow (Extended) in the Department of Physics, Calcutta University in the field of Laser Spectroscopy. Dr Biswas has. to his credit, more than fourteen research publications including papers in Conference/Seminar proceedings. He is a life member of Indian Physics Association and Indian Association for the Cultivation of Science, Calcutta. He has been invited by the Institüt für Physik, Johannes Gutenberg Universität Mainz. Germany to perform advanced scientific experiments and has joined the group on 07th March 2000.
P Nandi
Prashanta Nandi, born in 1946 in Calcutta, completed his BSc in the year 1967 from the University of Calcutta. From the childhood he takes a keen interest in electronic gadgets. Later on he concentrated his efforts on learning the details of Electronics.
Presently he is working as a Technical Superintendent in the Department of Physics, Calcutta University. He is also an integral pan of the Resource Persons for the Refresher courses on electronics which are held in the department.
P N Ghosh
Pradip N Ghosh, did his PhD from Calcutta University in 1976. Presently he is Professor of Physics in Calcutta University. He is Faculty member since 1971 and Fellow, WB Academy of Science and Technology: Former Research Associate. ETH, Zurich; Humboldt Fellow. Ulm. Mainz, Konstanz. Germany. Senior Invitation Fellow, JSPS. Japan.