Laser-Induced Damage To Silicon CCD Imaging Sensors

High-Power Lasers and Applications III

Guo

You-yu

2005

It is important to study the interaction effect between laser and photoelectric detector. In most of the laser detecting systems, laser must irradiate the photoelectric detector. The detector will be saturated or damaged easily if the fluence of the laser is higher than the saturation threshold of the detector. Now, many photoelectric detectors are used in space. To achieve their interaction， "Cat's eye" effect is applied to find and locate the remote aerial detector by laser. The possibility and mechanism of disturbance to remote aerial detector induced by laser are analyzed, and the factors of influence are also analyzed. The fluence of laser on the photoactive area of remote aerial detector is estimated. With two samples of CCD and TV tracking system, the mechanism of soft damage to CCD and TV tracking system induced by laser are introduced. The saturation of CCD and crosstalk of CCD are the main reasons of disturbance. When the tracking system is used in wave-door tracking mode, it will lose its tracking target if the saturation or crosstalk of CCD can enter into wave-door. At last, the influence to disturbance induced by atmosphere effect is also analyzed.

Section: Disturbance Of Ccdmentioning

confidence: 98%

Analysis of the disturbance of remote aerial detector induced by laser

High-Power Lasers and Applications III

Guo

You-yu

2005

“…Over the past decade, laser systems have become more and more powerful, low-priced, and compact [1,2] . Intense laser radiation is increasingly becoming a hazard to electro-optical imaging sensors, since complementary metal-oxide semiconductor (CMOS) or charge-coupled device (CCD) imaging sensors are very sensitive to high-intensity light fluxes from lasers [3,4] . High-power lasers may temporarily disrupt image acquisition, or even damage the optical sensor by excessively illuminating the sensor.…”

Section: Introductionmentioning

confidence: 99%

Experimental damage thresholds of a laser suppression imaging system using a cubic phase plate

et al. 2023

中国光学快报

The development of laser systems leads to an increasing threat to photoelectric imaging sensors. A cubic phase plate wavefront coding imaging system is proposed to reduce the risk of damage owing to intense laser radiation. Based on the wavefront coding imaging model, the diffracted spot profile and the light intensity distribution on the observation plane are simulated. An experimental device is set up to measure the laser-induced damage thresholds and investigate the morphology of laser-induced damage patterns of the conventional and the wavefront encoding imaging system. Simulations and experimental results manifest the superior laser suppression performance of the proposed method, which can help diminish the undesirable effects of laser irradiation on an imaging sensor.

“…The device didn't work properly when the leakage current reached 500 mJ/ cm2. When the energy density rises to 1 J/cm2, the device was seriously ablated [1][2][3] . In 1993, the group of C.Z.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the damage mechanism of gray point induced by 800 nm femtosecond laser pulse on IT-CCD camera

Shi

Sixth International Symposium on Laser Interaction With Matter

Xue

et al. 2022

As located in the focal plane of the imaging system, the image sensor will be easily influenced by the huge optical gain, which is brought in the image sensor by the external optical system and microlens on the surface of the device. Laser has a great influence on the image sensor, which is a sensitive link of the anti-laser reinforcement of the imaging system. Improving the performance in extreme light conditions in order to study the vulnerability of image has an important significance of reinforcement. As a typical visible light image sensor, which has advantages of sensitivity, high dynamic, small, light and so on, IT-CCD has been widely used in the fields of reconnaissance, detection and military. An 800nm femtosecond pulse laser was used to carry out experimental research on the laser irradiation effect of IT-CCD. The results shown that the local pixel of IT-CCD was in a state between undamaged and the white point damaged after irradiating by the laser, which was named by gray point. It was shown that the influenced pixels of IT CCD were changed by the laser, but no obvious deformation occurred. Through microscopic detection and analysis, the damage mechanism was expounded, further analysis was done. With focus ion beam (FIB) technique, it was found that there was photosensitive potential well, micro-structure of SiNx filling layer under microlens of the IT-CCD. When the gray point damage occurred, neither the photosensitive potential well at the bottom of the device was damaged, nor was the microlens structure on the surface. It turned out that the SiNx filling layer was influenced by the laser. Through elucidating the mechanism of this damage of the gray point, it lays a foundation for damage mechanism research.