Coherent unveils ultracompact VCSEL architecture
Patented module approach allows dynamic illumination and sensing with backside-emitting VCSEL arrays
Coherent, a US-based optical sensing company, has unveiled a patented module architecture for compact dynamic illumination and sensing with backside-emitting VCSEL arrays.
The rapidly growing number of applications for optical sensing in consumer electronics is driving the demand for optoelectronic subassemblies that fit in smaller spaces and achieve higher performance.
Coherent says its patented module technology enables ultracompact pattern projectors, flood illuminators, and tightly integrated sensing subsystems. The module technology relies on flip-chip assembly of backside-emitting VCSEL arrays on application-specific integrated circuits (ASICs) and supports the integration of photodetector arrays.
“The flip-chip approach eliminates the parasitic inductance from bond wires, improving the depth resolution and accuracy of time-of-flight sensors in consumer electronics,” said Julie Sheridan CTO. “Backside illumination optoelectronics enables not only the superior electrical performance of flip-chip assemblies, but also a higher level of optical integration with polarisation-locking and beam-shaping features embedded in the optoelectronic device.”
VCSEL arrays from Coherent can be designed to independently address individual or groups of emitters that are steered through diffractive optics, enabling the selective illumination of a region of interest within a dynamic scene.