Coherent supplies the full range of lasers and photonic solutions for defense and military applications, such as target designation, dazzling, countermeasure applications and other custom solutions.
As a vertically integrated semiconductor solutions provider, our diode laser fabrication includes MBE and MOCVD based solutions. For visible applications, Coherent’s proprietary Optically-Pumped Semiconductor Laser (OPSL) technology provides innovative solutions featuring power and wavelength scalability, as well as compact design. As an all semiconductor based product, Coherent products provide customers with superior reliability and performance in mission-critical environments.
The use of laser pulses to find range or other information of a distant target.
ght etection nd anging uses the same principle as RADAR. The LIDAR instrument transmits light out to a target. The transmitted light interacts with and is changed by the target. Some of this light is reflected or scattered back to the instrument where it is analyzed. The change in the properties of the light enables some property of the target to be determined. The time for the light to travel out to the target and back to the LIDAR is used to determine the range to the target.
There are three basic generic types of lidar:
Range finder LIDAR is used to measure the distance from the LIDAR instrument to a solid or hard target.
fferential bsorption LIDAR (DIAL) is used to measure chemical concentrations (such as ozone, water vapor, pollutants) in the atmosphere. A DIAL LIDAR uses two different laser wavelengths which are selected so that one of the wavelengths is absorbed by the molecule of interest whilst the other wavelength is not. The difference in intensity of the two return signals can be used to deduce the concentration of the molecule being investigated.
Doppler LIDAR is used to measure the velocity of a target. When the light transmitted from the LIDAR hits a target moving towards or away from the LIDAR, the wavelength of the light reflected/scattered off the target will be changed slightly. This is known as a Doppler shift - hence Doppler LIDAR. If the target is moving away from the LIDAR, the return light will have a longer wavelength (sometimes referred to as a red shift), if moving towards the LIDAR the return light will be at a shorter wavelength (blue shifted). The target can be either a hard target or an atmospheric target - the atmosphere contains many microscopic dust and aerosol particles that are carried by the wind. These are the targets of interest to us as they are small and light enough to move at the true wind velocity and thus enable a remote measurement of the wind velocity to be made.
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