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现有光栅衍射型激光告警中,正弦光栅存在±1级衍射效率较低,闪耀光栅在闪耀波长附近0级和-1级衍射效率很低,这两种光栅的缺点都降低了激光告警的可靠性。为此文中提出了一种改进型闪耀光栅。将两闪耀光栅反相对接,并且中间留一定无光栅空间,此改进可提高波长在闪耀波长附近0级和-1级的衍射效率,将有效克服传统闪耀光栅的漏报警现象。设计加工了闪耀波长为800 nm的改进型闪耀光栅,理论分析了0级和±1级衍射效率;采用波长为808 nm和850 nm的光,对改进型闪耀光栅进行二维激光告警实验测试,实验结果表明,在波长为闪耀波长附近光入射时,改进型较普通闪耀光栅的0级和-1级衍射强度有很大提高,能够被CCD有效探测。该改进型闪耀光栅可有效提高二维激光告警系统的可靠性。
In the existing grating diffraction type laser warning, ± 1 order diffraction efficiency of the sinusoidal grating is low, the blazed grating is at 0 level near the blaze wavelength and the -1 order diffraction efficiency is very low, both of the disadvantages of the grating reduce the reliability of laser warning Sex. In this paper, an improved blazed grating is proposed. The two blazed grating are oppositely connected in opposite phase, and there must be no grating space in the middle. This improvement can improve the diffraction efficiency of the 0 and -1 orders of the wavelength near the blaze wavelength, and can effectively overcome the leakage alarm phenomenon of the traditional blazed grating. An improved blazed grating with a blazed wavelength of 800 nm was designed and fabricated, and the 0th order and ± 1th order diffraction efficiency were theoretically analyzed. The two-dimensional laser warning experiment was carried out on the improved blazed grating with the wavelength of 808nm and 850nm. The experimental results show that the improved 0 and -1 order diffraction intensities of the improved blazed grating are greatly enhanced when the light is incident near the blaze wavelength and can be effectively detected by the CCD. The improved blazed grating can effectively improve the reliability of two-dimensional laser warning system.