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Currrent Issue: Volume 4, Number 1, 2016

Article

A Systematic Study of the Optical Properties of Co-, and Ni- Doped Colloidal Cadmium Sulphide Nanoparticles

1Department of Physics, Banasthali University, Banasthali-304022, India


Journal of Optoelectronics Engineering. 2016, 4(1), 11-16
doi: 10.12691/joe-4-1-3
Copyright © 2016 Science and Education Publishing

Cite this paper:
P. Bhambhani, P. A. Alvi. A Systematic Study of the Optical Properties of Co-, and Ni- Doped Colloidal Cadmium Sulphide Nanoparticles. Journal of Optoelectronics Engineering. 2016; 4(1):11-16. doi: 10.12691/joe-4-1-3.

Correspondence to: P.  Bhambhani, Department of Physics, Banasthali University, Banasthali-304022, India. Email: bpoojaphysics@gmail.com

Abstract

Present research paper deals with the synthesis and characterization of CdS:Co and CdS:Ni nanoparticles. CdS:Co and CdS:Ni nanoparticles are synthesized with the different concentration of Co and Ni with the use of polyethylene glycol (PEG) as capping agent. Samples are characterized by Scanning Electron Microscopy (SEM), Ultraviolet-Visible (UV-VIS) and Photoluminescence (PL) spectroscopy. The size of synthesized nanoparticles is obtained ~50 nm approximately by SEM images. The effect of doping concentration on optical properties of CdS nanoparticles is studied by UV-VIS and PL spectroscopy. Band gap of Cd1-xCoxS and Cd1-xNixS nanomaterials decreases with doping concentration. The results demonstrate that the doping concentration play an important role in optical features of nanomaterials. On behalf of the outcomes, it can be reported that the nanoparticles can be utilized as a photodetectors operating in visible region of increasing wavelengths.

Keywords

References

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Article

Advanced Test System for Comprehensive Characterization of Laser Seekers in the Presence of Countermeasures

1Scientist, DRDO, Room No. 204, Laser Science & Technology Centre, Metcalfe House, Civil Lines, Delhi-54, India

2Technical Officer, DRDO, Room No. 204, Laser Science & Technology Centre, Metcalfe House, Civil Lines, Delhi-54, India

3Engineering Graduate (Instrumentation & Control), PDM Engineering College, Bahadurgarh, India


Journal of Optoelectronics Engineering. 2016, 4(1), 5-10
doi: 10.12691/joe-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Varsha Agrawal, Vivek Goyal, Amit Dhyani. Advanced Test System for Comprehensive Characterization of Laser Seekers in the Presence of Countermeasures. Journal of Optoelectronics Engineering. 2016; 4(1):5-10. doi: 10.12691/joe-4-1-2.

Correspondence to: Varsha  Agrawal, Scientist, DRDO, Room No. 204, Laser Science & Technology Centre, Metcalfe House, Civil Lines, Delhi-54, India. Email: varshaaggarwal@lastec.drdo.in

Abstract

Precision guided munitions play a pivotal role in battlefield success by providing commanders with highly improved weapon accuracy. Laser guided bombs are widely exploited precision guided munitions in the contemporary battlefield scenario. These sophisticated weapons are of great tactical importance and also have huge price tags attached to them. Various countermeasures have evolved to deceive them from their intended target. This makes it important that their effectiveness is guaranteed 100 percent by validating operational parameters in realistic operational conditions including the effects of countermeasures designed to defeat their intended objective. This paper presents the design of an advance test system that can be used for comprehensive testing of laser seekers including its response to various types of decoying techniques. The approach is to use lasers having the same wavelength, pulse width and PRF as that of laser designators and countermeasure lasers simulating the same power densities as seen by the laser seekers. The hardware is configured around two semiconductor diode lasers having output wavelengths of 1064nm and PIC microcontroller based embedded system to drive these lasers. The laser seeker head was extensively tested using this advanced test system. The test results are presented in the paper.

Keywords

References

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[8]  Maini, A. K., Varma, A.L. and Agrawal, V., “New Electro-optic Simulator Design Concepts for Serviceability Checks of Laser Seekers and Laser Warning Sensors”, Journal of Battlefield Technology, Vol. 13, No. 2, July 2010.
 
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Article

Hybrid Raman/Erbium-Doped Fiber Amplifiers for WDM Transmission Systems

1Department of Physics, Kamla Nehru Institute of Physical and Social Sciences, Sultanpur (UP)-228118, India


Journal of Optoelectronics Engineering. 2016, 4(1), 1-4
doi: 10.12691/joe-4-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Sunil P. Singh. Hybrid Raman/Erbium-Doped Fiber Amplifiers for WDM Transmission Systems. Journal of Optoelectronics Engineering. 2016; 4(1):1-4. doi: 10.12691/joe-4-1-1.

Correspondence to: Sunil  P. Singh, Department of Physics, Kamla Nehru Institute of Physical and Social Sciences, Sultanpur (UP)-228118, India. Email: s_psingh74@rediffmail.com

Abstract

As light pulses propagate along the optical fiber, their energy dissipates. Beyond a certain distance the number of photons in pulses becomes too small to be detected. The optical pulses in fibers are energized by utilizing optical fiber amplifiers. The rapid growth of the internet and data traffic in optical fiber communication networks has stimulated the study of wideband optical amplifiers. Widening the bandwidth of fiber amplifiers is the primary issue in enlarging the capacity of wavelength-division multiplexed (WDM) transmission systems. This may be achieved by hybrid Raman/Erbium-doped fiber amplifiers. In this paper hybrid Raman/Erbium-doped fiber amplifier is simulated and almost flat gain of 21 dB is obtained for 1530-1565 nm wavelength range.

Keywords

References

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