Laser detection utilizing coherence

Benton, David M.; Zandi, Marie; Sugden, Kate

doi:10.1117/12.2532058

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…The use of imaging elements in LWSs is also prevalent. Imaging LWSs will include fisheye lenses to provide a high FOV, narrowband spectral filters, and imaging components 101 . Because the imaging element is so small, it can accurately orient the laser threat.…”

Section: Image Sensors Based Laser Warning Systemmentioning

confidence: 99%

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Analysis of structures and technologies of various types of photodetectors used in laser warning systems: a review

Mohammadnejad,

Aasi

2023

Opt. Eng.

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With the advancement of laser technology in recent decades, this device has been used in a wide range of applications, such as medical sciences, military, industry, holography, spectroscopy, and astronomy. In past years, military operations for better communication depended on radiofrequency. Vulnerability to security threats and exposure to electromagnetic interference were the main problems of this electromagnetic spectrum region. Therefore, attention was drawn to the visible and infrared (IR) regions. This spectrum provided a secure transfer of the data. The probability of intercepting a laser signal is very low due to the divergence of the narrow beam and the coherence of its optical beam. Hence, it has made this device a good candidate for secure military operations. As a result, the laser based-devices and laser-guided weapons (LGW), such as laser target designator and beam riders, have become an undeniable tool on battlefields. Reduction of the vulnerability to the LGW threats by providing laser detection, angle of arrival, wavelength discrimination, and temporal characterization is the main intention of the laser warning system (LWS). This system consists of three major subsystems. The optical subsystem will consist of spectral filters, focusing lenses, and the detection one, which is made of a few detectors in a unique array's configuration [especially IR photodetector (IRPD)], and the processing subsystem. In the last decades, with the progress made in nanofabrication and nanotechnology, consequential research has been done to enhance the performance of IRPDs, such as increasing the production yield, making it simple in the fabrication processes, lowering the fabrication cost, and increasing the operating temperature. This review paper gives a particular concentration to the photodetectors used in the detection subsystem of LWSs. In addition, some nanostructures have been surveyed to enhance the optical coupling and light-matter interaction of IRPD. Also, all studied structures are compared in a table. Finally, the detection subsystem we simulated and built at the Nanoptronics Research Center will be analyzed.

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Section: Image Sensors Based Laser Warning Systemmentioning

confidence: 99%

“…Imaging LWSs will include fisheye lenses to provide a high FOV, narrowband spectral filters, and imaging components. 101 Because the imaging element is so small, it can accurately orient the laser threat. In the past decade, due to the limitations of CMOS technology, CCD cameras have been used more for LWSs.…”

Section: Image Sensors Based Laser Warning Systemmentioning

confidence: 99%

Analysis of structures and technologies of various types of photodetectors used in laser warning systems: a review

Mohammadnejad,

Aasi

2023

Opt. Eng.

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“…These are categories based on what is observed rather than discriminating characteristic. Benton et al 6 took a classification approach based on the discrimination technique, classifying them into imaging, spectral, or coherence. The first two categories are both essentially discriminating based on brightness.…”

Section: Introductionmentioning

confidence: 99%

Laser detection using liquid crystal polarization modulators

Benton

2020

Opt. Eng.

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Lasers can be identified by their relatively long coherence lengths using interferometry. A Mach-Zehnder interferometer incorporating liquid crystal polarization modulators is demonstrated as a means of low-cost, robust laser detection. Temporal modulations, as a signature of coherence, can be induced by modulating polarization changes in liquid crystal modulators using low voltages. Sensitivities of <10 nW can be achieved. The suitability as a means of laser detection is discussed.

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“…These are categories based on what is observed rather than the discriminating characteristic. Benton [4] took a classification approach based on discrimination technique -imaging, spectral and coherence. The first two categories are both essentially discriminating based on brightness.…”

Section: Introductionmentioning

confidence: 99%

Coherence imaging for laser detection

Benton

Sugden

Zandi³

2020

Electro-Optical and Infrared Systems: Technology and Applications XVII

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The detection of lasers by means of coherence detection often uses interferometry in a one-dimensional manner such as with a Mach Zehnder interferometer. We are taking a two dimensional approach making use of a spatial light modulator and a camera to examine the results of binary holography in differentiating coherent and incoherent incoming light. A DMD micromirror array focusing light onto a CCD camera is presented as a method for determining the presence of coherent light, its wavelength and angle of arrival. We discuss the use of Zernike modes to overcome the aberrations inherent in the DMD device, thereby improving the focussing quality and improving the precision of wavelength determination.

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Laser detection utilizing coherence

Cited by 5 publications

References 21 publications

Analysis of structures and technologies of various types of photodetectors used in laser warning systems: a review

Analysis of structures and technologies of various types of photodetectors used in laser warning systems: a review

Laser detection using liquid crystal polarization modulators

Coherence imaging for laser detection

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