The colour of data

Published: Tuesday 30 April 1996

Manufacturers today are looking for ways to pack in more data in laser discs. But the most commonly used lasers emit red light which has a longer wavelength compared to blue light. Attempts to make a blue semiconductor laser have so far not been very successful.

Now, a team of scientists from the Nichia Chemical Industries, Japan, have built a violet semiconductor laser using an alloy called gallium nitride. Successful trials will mean that the data packed in a compact disc will almost double (Science, Vo1271,No 5247).

Subscribe to Weekly Newsletter :

Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.