FIGURE 2 Beam director aperture


laser modules Fiber


beam combiner Spectral COMBINE, CONTRAST


A spectral beam combiner does the opposite of a prism. It combines the different frequencies of each fiber laser module into a single beam. By contrast, when a beam of white light shines into a prism, the prism bends each frequency of light contained within the beam, scattering the white light into multiple beams of various colors. (SOURCE: SMDC/ARSTRAT and Oceloti/iStock)


Multiple subsystems are under development for integration into the weapon system. Tey include laser, beam control, electri- cal power, thermal management and fire control. Te goal of the FY22 demonstration is to confirm that a pre-prototype laser system can defeat RAM threats in an environment similar to the battlefield.


To reduce risk and provide information for HEL TVD develop- ment, the Army is using its High Energy Laser Mobile Test Truck (HELMTT). Te HELMTT has demonstrated laser lethality against small-caliber mortars and Group 1-2 (hobby-size) UAS using a slightly modified 10-kW commercial off-the-shelf fiber laser.


In FY14, this system underwent several proof-of-concept dem- onstrations, defeating small-caliber mortars and UAS. In FY16, the HELMTT was part of the Maneuver Fires Integrated Experiment (MFIX) 2016 at Fort Sill, Oklahoma, exposing the warfighter to the military utility of laser weapons. HELMTT also was used in the Joint Improvised-Treat Defeat Organization’s


UAS Hard-Kill Challenge in FY17. In addition to these dem- onstrations, the HELMTT has collected laser propagation data in a variety of environments, from coasts to high deserts. Tese data helped anchor models used to predict laser effectiveness on the battlefield.


Te 10-kW laser subsystem has been removed from the HELMTT to modify the platform for integration of the Lock- heed Martin RELI 50-kW-class laser. Te Army will test the 50-kW HELMTT against a variety of RAM and UAS targets in late FY18. Tis demonstration is designed to verify laser lethal- ity against RAM threats for the HEL TVD effort.


To ensure that laser weapons will be lethal against assigned threats, the Army is developing vulnerability modules for RAM and UAS. Te Solid State Laser Testbed on the High Energy Laser Systems Test Facility at White Sands Missile Range, New Mexico, collects lethality data for these targets. Engineers there analyze each threat to determine the best aimpoints, as well as the total laser energy required to defeat the threats. Te results


ASC.ARMY.MIL 71


SCIENCE & TECHNOLOGY / DASA(R&T) +


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