NOPR Collection: <b>Special Issue on Material Science and Application</b><b>Special Issue on Material Science and Application</b>http://nopr.niscpr.res.in/handle/123456789/559792026-10-09T06:55:33Z2026-10-09T06:55:33ZDiode-pumped Nd:YAG eye-safe laserSemwal, KireetBhatt, S Chttp://nopr.niscpr.res.in/handle/123456789/559902021-01-18T05:57:14Z2020-09-01T00:00:00ZTitle: Diode-pumped Nd:YAG eye-safe laser
Authors: Semwal, Kireet; Bhatt, S C
Abstract: Nd:YAG laser is pumped with two-dimensional side pumping diode-laser array. The wavelength from the Nd:YAG is 1064 nm, which is not safe for the eye. Here this eye hazardous laser is converted into the eye safe region using a singly resonant extra cavity KTP OPO. The output energy is an eye safe radiation at 1525 nm, with 8 mJ, corresponding to an energy conversion efficiency of 21 % at phase matching angle 21<sup>0</sup>, in a type-II, NCPM <em>x</em>-cut KTP crystal (15 × 10 × 10 mm) placed in a plane-parallel resonator.
Page(s): 181-1832020-09-01T00:00:00ZStudy of sodium potassium tantalate mixed systemUniyal, ManishBhatt, S CKashyap, SidharthJoshi, Adityahttp://nopr.niscpr.res.in/handle/123456789/559892021-01-18T05:54:39Z2020-09-01T00:00:00ZTitle: Study of sodium potassium tantalate mixed system
Authors: Uniyal, Manish; Bhatt, S C; Kashyap, Sidharth; Joshi, Aditya
Abstract: Ceramic pellets of Na<sub>1-x</sub>K<sub>x</sub>TaO<sub>3</sub> (x= 0 & 0.5) system have been prepared by solid state reaction method and sintering process. The prepared samples are characterized by XRD and SEM techniques. Lattice parameters have been calculated by XRD pattern and grain size has been calculated by SEM. It has been observed that the prepared samples show orthorhombic structure at room temperature.
Page(s): 184-1872020-09-01T00:00:00ZStructural and frequency dependent dielectric properties of 0.90PMN-0.10PT ferroelectrics at room temperatureKashyap, SidharthBhatt, S CUniyal, ManishKathait, Gambheer SinghKashyap, SavitaAditihttp://nopr.niscpr.res.in/handle/123456789/559882021-01-18T05:51:01Z2020-09-01T00:00:00ZTitle: Structural and frequency dependent dielectric properties of 0.90PMN-0.10PT ferroelectrics at room temperature
Authors: Kashyap, Sidharth; Bhatt, S C; Uniyal, Manish; Kathait, Gambheer Singh; Kashyap, Savita; Aditi
Abstract: In the present study, the composition of (1-x)PMN-(x)PT for X=0.10 binary solid solution was synthesized by double step columbite precursor method with multiple heat treatments at different temperatures. XRD analysis shows the single perovskite phase with minimized pyrochlore phase. The intense peaks of XRD pattern indicates the perovskite phase of composition. It was observed that the pyrochlore phase in the material can be reduced by increase in sintering temperature and proper stoichiometry. SEM micrograph shows the polygonal, dense and compact grain boundaries. Room temperature frequency dependent nature of Dielectric constant and tangent loss of prepared composition was also measured.
Page(s): 188-1922020-09-01T00:00:00ZOverview of LasersPurohit, Gunjanhttp://nopr.niscpr.res.in/handle/123456789/559872021-01-18T05:48:53Z2020-09-01T00:00:00ZTitle: Overview of Lasers
Authors: Purohit, Gunjan
Abstract: LASER (Light Amplification through Stimulated Emission of Radiation) is one of the most outstanding inventions of the 20<sup>th</sup> century. In contrast to common light sources, which emit incoherent photons at many frequencies, lasers generate coherent radiation at many wavelengths ranging from meter wavelength region to the soft X-rays region. Laser technology touches almost every aspects of daily life in the 21<sup>st</sup> century. Due to remarkable features of lasers such as directionality, coherences, monochromaticity and high intensity; they are used in a wide variety of applications in all walks of life starting with communications to medicine. This <em>article</em> covers a general overview of ‘LASERS’ and its current applications.
Page(s): 193-2032020-09-01T00:00:00Z