Schlieren, Switzerland.
indie (former EXALOS), the world’s leading supplier of Superluminescent Light-Emitting Diodes (SLEDs) for Optical Coherence Tomography (OCT) and other biomedical imaging applications, is releasing a 740-940nm combined-SLED module with ultra-broad bandwidth, high power and significantly improved spectral flatness. This has been achieved due to the recent development of new broadband SLEDs at 760 nm and 800 nm.
These so-called combi-SLEDs are standard 14pin Butterfly (BTF) modules that integrate four SLED devices at center wavelengths of 760 nm, 800 nm, 840 nm and 880 nm into a compact optical module, which are spectrally combined using high-performance dichroic filters. They deliver a 3dB and 10dB optical bandwidth of 165 nm and 190 nm, respectively, with a typical ex-fiber output power of 15 mW. This ultra-broad optical spectrum corresponds to a coherence length of 2.4 microns in air, which translates to an axial resolution of 1.8 microns in tissue for ultra-high-resolution OCT imaging. The combined optical spectrum has a uniform polarization orientation with an extinction ratio of more than 20 dB, which results in improved imaging performance with high imaging contrast and reliable resolution compared to conventional combined-SLED sources.
The patented combi-SLED architecture is realized using EXLOS’ automated, high-precision, micro-optical assembly platform (HOPP) that has been qualified based on Telcordia and MIL industry standards, meeting highest requirements for shock and vibration, high-temperature operation and long-term reliability.
