TOKYO (Reuters) - Japanese consumer electronics maker Sharp Corp. (6753.T: Quote, NEWS , Research) said on Tuesday it has started the commercial production of blue laser diodes, taking aim at a market with strong growth potential.Sharp in November began volume output of blue laser diodes, used to read and write data on high-definition optical discs, at 150,000 units a month at its existing plant in western Japan, Sharp spokesman Hiroshi Takenami said.The diodes can be used in DVD players based on the Blu-ray format, championed by Sony Corp. (6758.T: Quote, NEWS , Research), as well as competing HD DVD technology, promoted by...