Development of Industry’s Highest Output Power 638 nm Laser Diode by MITSUBISHI Electric
Pico Projector is an emerging technology gaining in popularity that applies the use of a projector in hand held devices such as mobile phones. The development of Pico Projector was a direct response to emergence of compact mobile devices such as mobile phone and PDA as well as digital cameras which offer adequate amount of storage capacity required to handle such application as presentation but lack the space in accommodating an attached display screen. The current pico size projectors employing LED as the light source are capable of projecting a wider range of colors in comparison to lamp-based projectors; however, they lack sufficient brightness for everyday use in a normally lit room. On the other hand the laser diode based pico projectors offer higher output power with less power consumption results in longer battery operation.
Furthermore, they provide a focus-free operation due to the fact that optical systems with great depth of field can be used with laser beams. Based on this Mitsubishi Electric made an announcement on development of new Red Laser Diode targeted to be used as a light source in Pico Projectors, offering industry’s highest output power of 500mW in 638 nm band laser diodes contributing to achieve a high-luminous projectors of up to 60 lumens in comparison to the LED-based projectors where typically offering a brightness of only about 10 lm. Additionally, the new laser diode, ML520G72 is capable of industry leading electrical conversion ratio of 32% at 500mW, and at a case temperature of 25 degrees Celsius helping to reduce power consumption in pico projectors. The ML520G72 can operate at a temperature range of -5 to 40 degrees Celsius when emitting 500mW continuous waves and up to 50 degrees Celsius under pulse operation at a duty ratio of 25% or less and frequency of 50Hz or higher. The shipment date is set for February 1, 2010, with a sample price of 50,000 JPY, which is kind of pricey for a tiny Laser Diode.