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ROHM has launched the RLD90QZW8 high-power laser diode, suitable for industrial equipment and consumer applications requiring distance measurement and spatial recognition. Laser Welding
In recent years, light ranging & detection (LiDAR) has been increasingly adopted in a wide range of applications that require automation – including AGVs (automated guided vehicles), robot vacuums and autonomous vehicles (AVs) – where it is necessary to accurately measure distance and recognize space. In this context, there is a need to improve the performance and output of laser diodes when used as light sources to increase detection distance and accuracy.
Picture: ROHM’s new high-power 120W laser diode for LiDAR.
To meet this demand, ROHM has established original patented technology to achieve a narrower emission width that contributes to longer range and higher accuracy in LiDAR applications. In 2019, the firm launched the 25W laser diode RLD90QZW5 followed by the 75W laser diode RLD90QZW3 in 2021. In response to the growing market demand for even higher output, ROHM developed the new 120W laser diode.
The RLD90QZW8 is a 120W infrared high-output laser diode developed for LiDAR used in distance measurement and spatial recognition in three-dimensional time-of-flight (3D ToF) systems. Original device development technology has allowed ROHM to reduce the temperature dependence of the laser wavelength by 66% over general products, to just Δ11.6nm (average 0.10nm/°C). This makes it possible to narrow the bandpass filter while extending the detection range of LiDAR. At the same time, a uniform light intensity of 97% is achieved over the industry’s smallest class of emission width of 270µm, representing a range of 264µm that contributes to higher resolution. Additional features that include high power-to-light conversion efficiency (PCE) enable efficient optical output that contributes to lower power consumption in LiDAR applications.
A variety of design support materials necessary for integrating and evaluating the new product is available free of charge on ROHM’s website that facilitate market introduction. To drive laser diodes with the high nanosecond-order speed required for LiDAR applications, ROHM has developed a reference design available now that combines the fiirm’s 150V EcoGaN HEMT and gate drivers.
A broad range of design data is available on ROHM’s website free of charge, including simulation (SPICE) models, board development data, and application notes on drive circuit design necessary for integration and evaluation that supports quick market introduction.
Picture: Reference designs for LiDAR incorporating these new products together with ROHM’s 150V EcoGaN and high-speed gate driver (BD2311NVX series) are available now on ROHM’s website.
ROHM has also gained certification under the IATF 16949 automotive quality management standard for both front-end and back-end processes at its manufacturing facilities. As a result, laser diode product development for automotive applications (AEC-Q102 compliant) is underway, with commercialization planned by the end of 2024.
ROHM launches 75W high-optical-output laser diode for LiDAR, AGVs, robots
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