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Nobel laureate Dr. Venkatraman Ramankrishnan received the “General President Gold Medal” from Dr. Manmohan Singh, at the Indian Science Congress in Chenai, India. He told there that scientists are not like movies stars or politicians who will fell insulted if they are not showered by accolades. Scientists are not interested in accolade.
The word LASER is an acronym for “Light Amplification by Stimulated Emission of Radiation”. As the name suggests, in lasers, the light is amplified with the help of a process called “Stimulated emission” Thus, the laser is based on the principle of stimulated emission.
In other words, it is a device to produce a monochromatic beam, a highly intense and coherent beam of light. The theoretical basis for the development of laser was provided by great scientist Albert Einstein in 1917 when he predicted the possibility of stimulated emission of radiations.
Therefore laser has the following properties:
1. Highly monochromatic: Monochromatic means that laser has a single wavelength as “mono means single” and “chromatic means color or wavelength”.
2. Highly directional
Coherence is again of two types;
1. Temporal coherence (also known as longitudinal coherence)
2. Spatial coherence (also known as transverse coherence)
The lasers can be a solid laser or gas laser or dye laser or even semiconductor laser. Ruby laser was the first laser to be operated successfully. If you want to understand how a laser works, then you can go through the articles related to the construction of a ruby laser and the working of the ruby laser.
If You have any doubt regarding the laser, please post in the comment section.
Joint Admission Test for M.Sc. – JAM 2011 for Admission to M.Sc.-PhD, M.Sc.-PhD. Dual Degree and other Post-B.Sc. programmes at IITs.
JNU New Delhi, on behalf of Department of Biotechnology, Government of India, will conduct the BINC examination on February 26-27, 2011. The objective of this examination is to certify bioinformatics professionals, trained formally as well as self-trained. Registration is open from 13-12-2010 to 03-02-2011. This year DBT has agreed to fund Research fellowships for all the BINC qualified Indian nationals to pursue Ph.D. in Indian Institutes/Universities. Note that the candidate must possess a postgraduate degree(or equivalent) & meet the criteria of the institutes/universities in order to avail research fellowship. In addition, cash prize of Rs. 10,000/- will be awarded to the top 10 BINC qualifiers. For more information, visit:
Vellore Institute of Technology Engineering Entrance Examination (VITEEE) for various technical courses will be held on April 16, 2011.
For more information, visit:
Common law admission test (CLAT)-2011 by West Bengal National University of Juridical Sciences, for admissions in LLB and LLM.
Last date of submission of forms: April 2, 2011.
Test on May 15, 2011
Indian Institute of Information Technology (IIIT-A) is offering PhD degree in IT/Management/Information security.
Last Date: Februray 6, 2011.
Admissions in bachelor and masters programme in Design management and technology.
For more information, visit: www.nift.ac.in
19the mathematics training and talent search programme to expose bright young students to the excitement of doing maths.