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Mid-infrared laser source for testing jamming code effectiveness in the field

机译：中红外激光源，用于在现场测试干扰代码的有效性

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摘要

We report a mid-infrared (mid-IR or 3.5 to 5.0 μm) laser source for testing jamming code effectiveness against heat-seeking missiles in open-field conditions. We developed an optical parametric oscillator (OPO) based on a ZnGeP_2 (ZGP) crystal for converting a 2.1-μm pump laser into mid-IR. The pump laser is an acousto-optically Q-switched Ho:YAG laser pumped by a continuous-wave (cw) Tm:fiber laser. The maximum possible average mid-IR power obtained is 6.5 W at a pump power of 20 W with a 33% power conversion efficiency. The pump pulses resulting from the Q-switched operation of the Ho:YAG laser have a pulse width of 30 ns (FWHM) at a pulse repetition frequency (PRF) of 50 kHz. We characterized the output beam in terms of its output power and wavelength spectrum. The output power of the pump laser can be modulated in a pattern of on/ off pulses with a smaller frequency than the PRF. The frequency and the duty cycle of these on/off pulses can be adjusted. Identical on/off pulse modulation appears on the mid-IR output beam after the OPO. It is possible to create jamming patterns and codes in mid-IR band using this feature. We have presented examples of on/off modulation of the OPO output at arbitrary pattern frequencies and duty cycles.
机译：我们报告了一种中红外（中红外或3.5至5.0μm）激光源，用于测试在开阔野外条件下对热导导弹的干扰代码有效性。我们开发了基于ZnGeP_2（ZGP）晶体的光参量振荡器（OPO），用于将2.1μm抽运激光器转换为中红外。泵浦激光器是由连续波（cw）Tm：光纤激光器泵浦的声光Q开关Ho：YAG激光器。在20 W的泵浦功率下获得的最大可能的平均中红外功率为6.5 W，功率转换效率为33％。由Ho：YAG激光器的Q开关操作产生的泵浦脉冲在50 kHz的脉冲重复频率（PRF）下具有30 ns（FWHM）的脉冲宽度。我们根据输出光束的输出功率和波长光谱对其进行了表征。可以以比PRF频率小的频率的开/关脉冲模式调制泵浦激光器的输出功率。这些开/关脉冲的频率和占空比可以调节。相同的开/关脉冲调制出现在OPO之后的中红外输出光束上。使用此功能可以在中红外波段创建干扰码型和代码。我们提供了在任意模式频率和占空比下对OPO输出进行开/关调制的示例。

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