5 October 2017 Compact 2100 nm laser diode module for next-generation DIRCM
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Abstract
Compact high-power 2100 nm laser diode module for next-generation directional infrared countermeasure (DIRCM) systems is presented. Next-generation DIRCM systems require compact, light-weight and robust laser modules which could provide intense IR light emission capable of disrupting the tracking sensor of heat-seeking missile. Currently used solid-state and fiber laser solutions for mid-IR band are bulky and heavy making them difficult to implement in smaller form-factor DIRCM systems. Recent development of GaSb laser diode technology greatly improved optical output powers and efficiencies of laser diodes working in 1900 - 2450 nm band [1] while also maintaining very attractive size, weight, power consumption and cost characteristics.

2100 nm laser diode module presented in this work performance is based on high-efficiency broad emitting area GaSb laser diode technology. Each laser diode emitter is able to provide 1 W of CW output optical power with working point efficiency up to 20% at temperature of 20 °C. For output beam collimation custom designed fast-axis collimator and slow-axis collimator lenses were used. These lenses were actively aligned and attached using UV epoxy curing. Total 2 emitters stacked vertically were used in 2100 nm laser diode module. Final optical output power of the module goes up to 2 W at temperature of 20 °C. Total dimensions of the laser diode module are 35 x 25 x 16 mm (L x W x H) with a weight of ~28 grams. Finally output beam is bore-sighted to mechanical axes of the module housing allowing for easy integration into next-generation DIRCM systems.
Conference Presentation
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Edgaras Dvinelis, Mindaugas Greibus, Augustinas Trinkūnas, Greta Naujokaitė, Augustinas Vizbaras, Dominykas Vizbaras, Kristijonas Vizbaras, "Compact 2100 nm laser diode module for next-generation DIRCM", Proc. SPIE 10435, Technologies for Optical Countermeasures XIV, 104350B (5 October 2017); doi: 10.1117/12.2277590; https://doi.org/10.1117/12.2277590
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