Infrared VCSEL Laser: LED-Like Performance

Rohm, a leading technology company, has introduced a groundbreaking infrared light source that incorporates a VCSEL (Vertical Cavity Surface Emitting Laser) element within a resin optical diffusion material. This innovative product, known as the Rohm VCSELED, is designed to revolutionize automotive Driver Monitoring Systems (DMS) and In-Cabin Monitoring Systems (IMS) by offering a more precise VCSEL laser with the stability and wide beam characteristics of an LED.

The European Union has announced plans to mandate the installation of driver monitoring systems in all new vehicles sold in Europe starting from July 2024. In response to this regulatory development, car manufacturers and suppliers are actively working on in-vehicle monitoring systems that can detect occupants other than the driver. There is a growing recognition of the importance of high-performance light sources that can enhance the accuracy and functionality of detection systems.

The VCSELED by Rohm delivers exceptional sensing accuracy with minimal wavelength temperature variation and a wide emission beam angle. These features not only make it ideal for in-vehicle monitoring applications but also enable its use in enhancing the precision and performance of inspection systems for robots, industrial equipment, spatial recognition, and ranging systems.

By extending the beam angle similar to LEDs, the VCSELED combines a high-performance VCSEL element with light diffusion material to facilitate sensing over a broader area with greater accuracy compared to traditional VCSELs. The integration of the light emitting element and light diffuser within a compact 3.0 x 3.0 x 0.55mm package allows for smaller and thinner applications, making it versatile for various technological implementations.

One of the key advantages of the VCSEL element is its narrow emission wavelength bandwidth of 4nm, which is approximately one-seventh that of LEDs. This characteristic enhances resolution performance on the receiving end while eliminating the red glow commonly associated with LEDs. Additionally, the wavelength temperature variation of just 0.072nm/°C, significantly lower than that of LEDs (0.3nm/°C), ensures high-accuracy sensing even in fluctuating temperature conditions.

Rohm is actively pursuing the commercialization of VCSELED as a cutting-edge technology brand for infrared light source components. Prototype samples are currently available for purchase, with plans for mass production samples targeted for consumer release in October 2024 and automotive applications in 2025.

For more information, visit www.rohm.com.