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Chen Y.,Changchun University of Science and Technology | Huo F.,Changchun University of Science and Technology | Zheng L.,Changchun New Industries Optoelectronics Technology Co.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Ultraviolet (UV) spectrum of 200nm-300nm from the sun is absorbed by the ozone layer around the earth, which forms the solar-blind spectral region near the ground. Within this spectral region, UV signal interference will be very small. By the characteristics of solar-blind spectral region, it can be used in the fields such as prevention of forest fires, missile approach warning etc. An optical system with FOV 46° is designed for missile approach warning in this paper. To enhance the FOV enlarge the aperture and improve the image quality, two aspheric surfaces and one binary element are adopted in the optical system. PIXIS2048BUV-type camera is selected as the detector of the system, which has pixel size 13.5μm x 13.5μm and imaging area 27.6mm x 27.6mm. After optimization, the RMS radius for maximum FOV is 18μm, which is slightly larger than one pixel size. For other FOV, the RMS radius are all much less than the pixel size. From the encircled energy curve, over 80% of the energy from the object is converged within the circle of radius 6.51/4m. Point spread function of each FOV is high enough, which shows the designed optical system has good convergent degree of energy as an energy system.. © 2014 SPIE. Source


Shao Y.,Changchun University of Science and Technology | Zhang Y.-B.,Changchun New Industries Optoelectronics Technology Co. | Gao X.,Changchun University of Science and Technology | Du C.,Changchun University of Science and Technology | Lin J.-Q.,Changchun University of Science and Technology
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

Laser-induced breakdown spectroscopy (LIBS) is a kind of spectroscopic technique for the qualitative and quantitative analysis of elements, which has been rising with the development of laser technique and optical detection technique in recent years. The present paper gives a review of the situation of the recent research progress in LIBS technique. The detailed latest application progress in LIBS in the metallurgy, environmental pollution detection, biomedicine, botany and space exploration field is shown. Source


Chen Y.,Changchun University of Science and Technology | Huo F.,Changchun University of Science and Technology | Zheng L.,Changchun New Industries Optoelectronics Technology Co.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Ultraviolet (UV) radiation of 200nm-300nm waveband from the sun is absorbed by atmosphere, which is often referred to the solar-blind region of the solar spectrum. Solar-blind characteristics of this waveband have important application value in forest-fire prevention, UV security communication, UV corona detection and other aspects. Especially in military fields such as missile warning, the application of solar-blind waveband has developed very rapidly, which is receiving more and more attention recently. In this paper, ZEMAX software is used to design an optical system of solar-blind UV target receiver with waveband 240nm-280nm, with which UV target signal can be detected. The optional materials are very few for UV optical systems to choose from, in which only CaF2 and JGS1 are commonly used. Various aberrations are not easy to be corrected. So it is very difficult to design a good UV system. Besides, doublet or triplet cannot be used in UV optical system considering possible cracking for different thermal expansion coefficients of different materials. So the doublet in initial structure is separated for this reason. During the optimization process, an aspheric surface is used to correct the aberrations. But this surface is removed before the design is finished to save production cost and enhance the precision of fabrication and test, which still keeps the image quality meeting the usage requirements. What we care for is the converging condition for different field of view from the far object on image plane. So this is an energy system. Spot diagram is taken as the evaluation criterion of image quality. The system is composed of 6 lenses with field of view (FOV) 31 degrees. In the final design results, the root mean square (RMS) radius for marginal FOV is less than 6.3 microns, while the value is only 4 microns for zero FOV. Point Spread Function and diffraction encircled energy diagram within the maximum FOV confirms the good performance of system further. © 2014 SPIE. Source


Dong L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.,Changchun New Industries Optoelectronics Technology Co.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2016

In order to manufacture MOPA structure pulse single-frequency laser used for laser coherence imaging, the changes of temporal coherence of pulse single-frequency laser with the increment of laser power is required to be studied. This paper adopted acousto-optic Q-switch pulse single-frequency Nd:YVO4 laser as seed, and adopted Nd:YAG power amplifier modules to double the power of seed laser. The Michelson interferometry was used to complete the measurement of the contrast of fringes of seed laser and amplifier under the optical path difference from 0 m to 6 m. Then, the change of temporal coherence of pulse single-frequency laser with the increment of laser power was primarily obtained. The measurements of basic parameters of seed laser and amplifier such as the property of single-frequency, pulse energy, pulse width and peak power etc was completed. © 2016, Editorial Office of Opto-Electronic Engineering. All right reserved. Source


Chen Y.,Changchun University of Science and Technology | Huo F.,Changchun University of Science and Technology | Zheng L.,Changchun New Industries Optoelectronics Technology Co.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Ultraviolet (UV) radiation of 200nm-300nm waveband from the sun is absorbed by atmosphere, which is often referred to the solar-blind region of the solar spectrum. Solar-blind characteristics of this waveband have important application value, especially in military fields. The application of solar-blind waveband has developed very rapidly, which is receiving more and more attention. Sometimes, to test the performance of a UV optical system, a standard solar-blind UV target simulator is needed as the UV light source. In this paper, an optical system of a solar-blind UV target simulator is designed with waveband 240nm-280nm. To simulate a far UV target, the focal length of this UV optical system needs to be long. Besides, different field of view (FOV) of the system should meet aplanatic condition. The optional materials are very few for UV optical systems, in which only CaF2 and JGS1 are commonly used. Various aberrations are difficult to be corrected. To save production cost and enhance the precision of fabrication and test, aspheric surfaces and binary elements are not adopted in the system. Moreover, doublet or triplet cannot be used in UV optical system considering possible cracking for different thermal expansion coefficients of different materials. After optimization, the system is composed of 4 lenses with focal length 500mm. MTF curves of different FOV coincide together. The maximum RMS radius of the optimized system has almost the same size as Airy disk, which proves the good image quality after system optimization. The aplanatic condition is met very well in this system. In the spot diagram, root mean square (RMS) radius changes from 3 microns to 3.6 microns, which has similar size with Airy disk and meets aplanatic condition very well. This optical system of solar-blind UV target simulator also has relatively loose tolerance data, which can prove the system is designed in an optimal state. © 2014 SPIE. Source

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