Reticle-based seekers have significantly advanced for 60 years and widely used in modern warfare as a major threat to the safety of all types of airborne platforms including fighters, helicopters, transport aircraft and even civil aviation. Reticle-based seeker can convert the light signal radiated by the tracking target into a modulated signal carrying target orientation information, and the tracking effect is affected by noise, complex background and various jamming signals. In this paper, we analyze the target location extraction mechanism of typical reticle-based seekers and the dynamic simulation of the process of jamming with reticle-based seeker by mid-infrared laser with different modulation methods is developed using Matlab. The main factors affecting the effectiveness of IR countermeasures is obtained. The results show that the intensity, frequency and phase of the jammer signal have a certain influence on the tracking accuracy of the reticle-based seeker, with the laser power having the greatest influence on the jamming effect of reticle-based seeker. This study provides a theoretical basis for the optimization of operational indicators for infrared laser countermeasures.
We demonstrate a compact narrow linewidth high beam quality diode pumped solid-state microsecond (μs) pulse yellow laser at 589 nm by intra-cavity sum-frequency generation (SFG). The resonators are based on a symmetrical co-folding-arm plane-plane structure with a two-rod configuration for birefringence compensation, working in a thermally near-unstable range of the cavity. A twisted-mode cavity for spatial hole-burning elimination and an etalon in 1319 and 1064 nm resonators are employed to realize the narrow linewidth laser output. Moreover, in order to improve the SFG efficiency, the laser spiking due to relaxation oscillations is suppressed by inserting frequency doublers in both 1319 and 1064 nm oscillators. By carefully designing the cavity, a 4.8 W quasi-continuous wave yellow laser source at 589 nm is generated with a beam quality factor of M2 = 1.63 and a linewidth of ~ 0.44 pm. The 589 nm laser is operated at a repetition rate of 500 Hz with pulse duration of ~ 115 μs.
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