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October 7, 2021

ROHM 75Wdiode 400x275ROHM Semiconductor has announced the development of a high optical output laser diode, the RLD90QZW3, designed for applications such as automated guided vehicles (AGVs), service robots in the industrial equipment sector, and consumer robot vacuums that incorporate lidar for distance measurement and spatial recognition.

With the growth of lidar being adopted in applications that need to be automated to precisely measure distance and for spatial recognition, the company said there is a need to improve the laser diodes when used as light sources to increase detection distance and accuracy, while reducing power consumption.

ROHM said it meets this market requirement by establishing original patented technology to achieve narrower emission width. This contributes to a longer range and higher accuracy in lidar applications. In 2019, the company released the RLD90QZW5 25W laser diode, which has been adopted primarily in the consumer electronics sector. The new model expands applicability in the industrial sector by providing higher optical output.

THe RLD90QZW3 is a 75W infrared high optical output laser diode designed for lidar (distance measurement) and spatial recognition (in 3D Time of Flight) systems. ROHM said it can achieve an emission width of 225μm at equivalent optical output, which is 22% narrower than conventional products, improving beam characteristics. 

“At the same time, uniform emission intensity together with low temperature dependence of the laser wavelength ensure stable performance – contributing to higher accuracy and expanding longer distances in various LiDAR applications,” the company said. “Moreover, a power conversion efficiency (which is at trade-off with narrow emission width) of 21% – the same as standard products (at a forward current of 24A and 75W output) – enables use without an increased power consumption.”

More details and specifications on the diode are available at the ROHM Semiconductor website, including design support data, optical circuit simulation models and application notes on drive circuit design. 

The company added it is currently developing even higher output 120W laser diodes for the automotive sector (AEC-Q102 qualified).

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