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Mitsubishi Electric Corporation will launch a new continuous-wave (CW) laser diode (LD), the ML562G85, offering what they claim to be a world-record output power of 2.1 W and a brilliant 639-nanometer(nm) red light for projectors on February 1, 2017. The laser diode's pure red color and low power consumption are expected to be adopted for large-venue laser-based projectors requiring high brightness.
It has been a technical challenge to produce red LDs offering high output at high temperature using a lasing wavelength not exceeding 640 nm, the preferred maximum for achieving necessary luminosity. Mitsubishi Electric succeeded in developing its new CW high-power red laser diode that operates at high temperature by using original high-power technology, including an optimized laser diode structure.
Product Features:
1. 2.1 W output power in CW and brilliant 639-nm red light
- Optimized epitaxial structure and emitter size enables world-record 2.1W output (CW), 4.2 times greater than that of the company's current model
- High-luminosity 639-nm laser light and 2.1W output (CW) produce 250 lumens per LD
- High wall-plug efficiency of 41 percent at 2.1W (CW) and low case temperature of 25 degrees Celsius help to reduce projector power consumption
2. Widest operating temperature range for a red LD thanks to improved heat dissipation
- Large 9.0-mm-diameter transistor-outline can (TO-CAN) package improves heat dissipation
- Unprecedented operating temperature range of 0 to 45 degrees Celsius at 2.1W (CW), compared to the current model's range of 0 to 40 degrees Celsius at 0.5W (CW)
Currently, light sources used for projectors are shifting from mercury lamps to solid-state lights, which offer advantages such as high wall-plug efficiency, wide color gamut and extra-reliable operation. LDs, which are especially efficient compared to other solid-state lights, can help projectors to achieve low power consumption. Also, only LDs can emit pure-color light in a wide power range to enable a projector to realize a wide color gamut (ITU-R BT.2020 compliant) and high dynamic range. LDs are drawing much attention as the likely light source for advanced projectors.
There are two types of LD light sources for projectors - CW and pulsed. In November 2010, Mitsubishi Electric launched its high-power-red LD (ML501P73), which offers output of 1.0W (pulse) or 0.5W (CW) for its 638-nm light. The LD incorporates original epitaxial growth technology and window-mirror structure. Also, the ML562G84 launched in September 2015 achieves 2.5 W of power for its 638-nm light in pulse operation.
