Bright and Vivid: Providing the “real red” that video professionals have been hoping for
Super High Power Red Laser Diode Achieves
the Short Wavelength of 635 nm
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Sony presented its Laser Dream Theater
at the 2005 World Exposition, Aichi, Japan.
This Laser Dream Theater used lasers as its light source
and presented beautiful images to its many visitors
during the exposition.
(See the Side View article in CX-News Volume 40.)
The red light source used for this system
included a Sony-developed high power red laser diode array that
achieved a 4.4 W optical power output at a wavelength of 645 nm.
Recently, however, the high power laser applications
that have received the most attention have been display systems.
In this issue, we introduce a Sony-developed super high power
red laser diode array that achieves a 7 W optical power output
at the even shorter wavelength of 635 nm.
In particular, we discuss device operation
at 35°C and present a discussion with the developers. |
 Red Laser Diode Main Features
1. 7.2 W optical power output
This laser uses a 2.5 × 1.4 cm rectangular, 4.4 mm thick, compact
heat sink, and can implement high power light sources that are easy
to use in projectors and other applications.
2. Bright light source with a wavelength of 635 nm
This results in a light source that is 1.6 times brighter visually than
the 645 nm wavelength red laser diode Sony developed in 2005.
3. A 23% energy conversion efficiency at an operating temperature of 25°C
Since the energy conversion efficiency is comparatively high, the
heat generated by the device itself is small, and since the device
can be operated at 25°C, the cooling structure can be smaller.
Red Laser Diode Main Specifications
| Wavelength |
635 nm |
| Operating current |
14 A |
| Operating voltage |
2.2 V |
| Optical power output |
7.2 W |
| Conversion efficiency |
23 % |
| Divergence angle (vertical) |
42° |
| Divergence angle (horizontal) |
10° |
| Operating temperature |
25°C |
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Vol.55
