April 20., 2022: EXALOS, the world’s leading developer of visible
Superluminescent Light Emitting Diodes (SLEDs) and highly customized semiconductor light sources, announces that it has joined the recently formed LaSAR (Laser Scanning for Augmented Reality) Alliance, an international federation of leading industry groups and consortia dedicated to the advancement of augmented reality (AR) eyewear applications.
Red, green and blue edge-emitting lasers with milliwatt output powers and exceptional efficiency are lining up for augmented-reality applications. Recently, we have developed visible laser diodes that break new ground for low drive currents and minimal power consumption. These strengths, in demand for next-generation AR displays, give our lasers the credentials to compete in this sector with VCSELs, which are undoubtedly promising but less mature.
EXALOS presents a miniaturized, full-color RGB light source module for near-to-eye display systems, incorporating three semiconductor laser diodes (LDs) that are integrated on a free-space, micro-optical bench together with collimation optics and wavelength filters. The ultra-compact package delivers up to 10 mW per color at low power dissipation values of 640 mW and provides low-divergent output beams.
We are demonstrating a high-power light source, where ASE from a SLED is amplified by a semiconductor optical amplifier in order to generate power levels of 100-300 mW in free-space. The optical architecture of this light source resembles a master oscillator power amplifier (MOPA) configuration.
EXALOS VISIIIBLESRGB: EXALOS presents the first light source module that is realized with RGB SLEDs in a compact 14-pin butterfly housing for speckle-free display applications. The module provides a free-space output with collimated RGB beams that are colinearly aligned having 10 mW output power per color.
The test, published in Scientific Reports 7: 5893, compares the Coherence properties of the following 5 light sources and their effect on the image sharpness and speckle of holographic displays.
EXALOS has expanded its product portfolio with the introduction of a compact RGB SLED module that will enable the advancement of micro-display architectures for augmented reality (AR) and head-up displays (HUDs).
Superluminescent light-emitting diodes (SLEDs) are very attractive as compact, highly efficient light sources for various applications in the visible red spectral region. EXALOS investigated the electro-optical performance of SLEDs operating at center wavelengths of 625-650 nm with interesting results.
SLEDs, also known as high-power LEDs and “laser diodes operating below threshold,” are semiconductor light sources that have a broadband output optical spectrum, like LEDs, at high power levels, like laser diodes. This combination is valuable in a variety of applications, and as a consequence, these emitters are finding commercial use.
EXALOS VISIIIBLESRGB are designed as reliable high-performance light sources with a long life span. Stable electrical characteristics during the whole lifetime are one of the most essential features for the acceptance of the emerging new generations of next-to-the-eye display technologies.
Modern Superluminescent LEDs offer distinct optical attributes compared to LEDs and laser diodes and are the preferred choice for imaging applications that call for reduced speckle and minimal interference noise.
The sensitivity of the human eye is rapidly decreasing for the red spectral region with a slightly increasing wavelength. Which wavelength in the red spectral range would be the best for modern lasers and SLEDs.