![]() ![]() Since transitioning from a polarization-sensitive beam steering system to a polarization-insensitive beam steering system would require an increase in the number of optical substrates, the most weight benefit of such a transition would be gained if the substrate weight is minimized. ![]() This would allow reduced weight and/or size of such steering systems because it would allow the LiDAR receiver to use all of the optical power returned from a target, rather than only returned radiation of one polarization. Under the current project, these techniques will be extended to LiDAR beam steering that is polarization-insensitive. Most previous work with this technology has concentrated on steering techniques that are polarization sensitive. Previous work has shown that LiDAR beam steering with diffractive components based on spatial modulation of geometrical phase is feasible and useful. The purpose of this project is to develop techniques that make it possible to reduce the size and weight of non-mechanical LiDAR beam steering systems. In Phase II, we plan to boost the power levels of the Lidar Transmitter, and possibly integrate etalons and interference filters in the Lidar Receiver to suppress the solar background to eventually obtain reasonable SNRs in the daytime for ozone observations. It is well known that solar background radiation can cause Lidars to have low signal to noise ratio (SNR) at daytime. In Phase I of this SBIR project, we will focus on obtaining ozone observations at nighttime. Subsequently, we aim to implement an ozone lidar with such fiber-based light sources and obtain preliminary observation data. The amplification of the above-mentioned 1030 nm, 1535 nm, and 1064 nm lasers will utilize AdValue Photonics’ proprietary silicate glass high peak power large mode field diameter (MFD) ytterbium (Yb) and erbium (Er) doped fiber amplifiers. The 355 nm laser will be generated from the third harmonic from AdValue Photonics’ 1064 nm IR laser. The 308 nm laser will be generated from the frequency mixing of 515 nm and 768 nm laser, which are the second harmonic generation of 1030 nm and 1535 nm laser, respectively. The proposed Lidar will have the advantage of being suitable to various observational platforms with harsh environment and limited resources. In this proposal, we aim to design and build a compact, robust, reliable, efficient, anti-vibrational, and easy-to-maintain stratospheric ozone Lidar with AdValue Photonics’ unique single frequency tunable UV lasers at 308 nm and 355 nm based on all-fiberized master oscillator power amplifier (MOPA). Differential absorption Lidar (DIAL) technology has played a critical role in obtaining range-resolved ozone profiles in the atmosphere. The science community has spent tremendous efforts for the observation of ozone concentration in the atmosphere. They influence the environment, the atmosphere, and the global climate. These system on chip (SoC) ASICs implement built-in digital signal processing (DSP) and control interfaces that can enable precise time of flight (ToF) measurements of back-scattered laser light pulses with low light for use in orbiting or aerial LiDAR applications.īoth stratospheric ozone and tropospheric ozone significantly affect lifeforms on Earth. We are currently developing a range of application specific integrated circuits (ASICs) for DOE Office of High Energy Physics (HEP) projects that have channel counts ranging from 4 to 64 per ASIC, which could be modified for this task specifically. NSL has extensive experience with single-photon detection with extremely high timing resolution through our work with HEP collider and astrophysics experiments. For a full-scale detector, multiple channels (up to 64) would be serviced by a single chip. The primary method by which the CoDLiR will accomplish this goal is the integration of feature extraction, digital processing, and bias control onto one single low-power chip. Technical Abstract (Limit 2000 characters):Ī reduction in space and power requirements for each channel of a LiDAR system would allow for a system with significantly more channels and/or a system small enough to fly on CubeSat scale vehicles.
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