Speckle Free, Low Coherency, High Brightness, and High Pulse Speed Infrared Collimated Light Sources for Mid-IR Target Designator and Hyperspectral Imaging
Abstract
The indium phosphide-based SLED is an ideal light source for eye-safe target designation and imaging at 1550 nm spectral region. Its wide spectral width ensures low coherency, which is critical for speckle free imaging. A high brightness and well-collimated output beam allow for projection of the illumination across long distances. In this project, a high brightness SLED chip that exceeds 200 mW in peak optical power output and >20 nm of spectral bandwidth at 1550 nm wavelength has been designed, developed and demonstrated. This optical power level is the highest value ever achieved, exhibiting more than 2 times improvement over baseline SLED chips operating in the same wavelength range. The SLED chip is packaged into a compact 7-pin TO-8 platform with built-in collimating aspherical lens, and the resultant transmitter optical sub-assembly (TOSA) achieved a very low beam divergence of 1 mrad. Additionally, an optical pulse stream of IOns pulse width, 0.1% duty ratio and rise and fall times of 1 ns has been demonstrated, allowing for high speed pulsed illumination applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 2007
- Accession Number
- ADA483027
Entities
People
- Yee-loy Lam