Pure and Molybdenum (Mo) doped Potassium Titanyl Phosphate (KTP) inorganic crystals were grown by high temperature solution growth (HTSG) from poly phosphate (K6P4O13) flux using different KTP/Flux ratios. The pure an...Pure and Molybdenum (Mo) doped Potassium Titanyl Phosphate (KTP) inorganic crystals were grown by high temperature solution growth (HTSG) from poly phosphate (K6P4O13) flux using different KTP/Flux ratios. The pure and doped KTP crystals of size 20x13x5 mm3 and 7x5x2.5 mm3 respectively were grown successfully by spontaneous nucleation. The grown crystals were characterized by XRD, UV, FTIR and Hardness studies. Micro hardness studies show that the pure crystals are harder than the Mo doped crystals.展开更多
Organic non-linear optical crystal diphenyl urea with molecular formula C13H12N2O was synthesized and grown successfully by slow evaporation solution growth technique. The single crystal X-ray diffraction (XRD) confir...Organic non-linear optical crystal diphenyl urea with molecular formula C13H12N2O was synthesized and grown successfully by slow evaporation solution growth technique. The single crystal X-ray diffraction (XRD) confirms that it crystallizes in orthorhombic crystal system with non-centrosymmetric space group Pna21. The various functional groups were identified qualitatively by Fourier transform-infra red (FT-IR) and FT-Raman techniques. The electron absorption spectrum was studied by UV-Vis spectrophotometer. Thermal behavior of the crystal was evidenced by thermogravimetric (TG) and differential scanning calorimetric (DSC) analyses. From DSC the melt ing point of the crystal is found to be 145°C. The existence of second harmonic generation (SHG) signal was evidenced using Kurtz Perry powder test and the efficiency of the crystal was found to be 0.64 times that of the standard KDP crystal.展开更多
Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency for laser range finding and warning receiver applications as well as day and night military laser designati...Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency for laser range finding and warning receiver applications as well as day and night military laser designation systems. In this paper we presents theoretical calculations using Advanced Dynamics Professional LASCAD software and experimental studies for a high power pigtailed fiber diode laser module of 8 W operating at 808 nm with a specially designed high efficiency cooling system, end pumped high-efficiency Nd:YVO4 laser of 3 × 3 × 10 mm rod and overall cavity length of 44 mm. To the best of our knowledge a self Q-switching effects was generated in Nd:YVO4 laser by changing the cavity dimensions and the position of the intracavity KTP crystal at certain regime of operation for the first time, in which the cavity length is reduced to be 30 mm and the distance between Nd:YVO4 rod and KTP crystal is only 1mm. Self Q-switched laser pulse at 532 nm with high peak power of 96 W, pulse width of 88 ns at FWHM and repetition rate of 400 kHz was achieved. Experimental studies of a passive Q-switched Nd:YVO4 laser using Cr:YAG crystal with three different transmissions of 30%, 40% and 70% were investigated. Passive Q-switched laser pulse at 1064 nm and narrow line width of less than 1.5 nm with highest peak power of nearly 18 kW, short pulse width of less than 4 ns at FWHM and higher repetition rate of 45 kHz using Cr:YAG with transmission of 30% was achieved for the first time.展开更多
Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>...Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>2</sub>. Both are hi-tech products marketed by the Fujian Castech Crystals Inc., a business entity affiliated to the CAS. The successful development of the two was honoured with a special prize, a first-grade prize and a second-grade prize of the CAS Awards for S&T Progress in 1986, 1989 and 1990 respectively. Also, they were crowned with a prize of the展开更多
文摘Pure and Molybdenum (Mo) doped Potassium Titanyl Phosphate (KTP) inorganic crystals were grown by high temperature solution growth (HTSG) from poly phosphate (K6P4O13) flux using different KTP/Flux ratios. The pure and doped KTP crystals of size 20x13x5 mm3 and 7x5x2.5 mm3 respectively were grown successfully by spontaneous nucleation. The grown crystals were characterized by XRD, UV, FTIR and Hardness studies. Micro hardness studies show that the pure crystals are harder than the Mo doped crystals.
文摘Organic non-linear optical crystal diphenyl urea with molecular formula C13H12N2O was synthesized and grown successfully by slow evaporation solution growth technique. The single crystal X-ray diffraction (XRD) confirms that it crystallizes in orthorhombic crystal system with non-centrosymmetric space group Pna21. The various functional groups were identified qualitatively by Fourier transform-infra red (FT-IR) and FT-Raman techniques. The electron absorption spectrum was studied by UV-Vis spectrophotometer. Thermal behavior of the crystal was evidenced by thermogravimetric (TG) and differential scanning calorimetric (DSC) analyses. From DSC the melt ing point of the crystal is found to be 145°C. The existence of second harmonic generation (SHG) signal was evidenced using Kurtz Perry powder test and the efficiency of the crystal was found to be 0.64 times that of the standard KDP crystal.
文摘Diode end-pumped solid-state lasers have the potential to yield high quality laser beams with high efficiency for laser range finding and warning receiver applications as well as day and night military laser designation systems. In this paper we presents theoretical calculations using Advanced Dynamics Professional LASCAD software and experimental studies for a high power pigtailed fiber diode laser module of 8 W operating at 808 nm with a specially designed high efficiency cooling system, end pumped high-efficiency Nd:YVO4 laser of 3 × 3 × 10 mm rod and overall cavity length of 44 mm. To the best of our knowledge a self Q-switching effects was generated in Nd:YVO4 laser by changing the cavity dimensions and the position of the intracavity KTP crystal at certain regime of operation for the first time, in which the cavity length is reduced to be 30 mm and the distance between Nd:YVO4 rod and KTP crystal is only 1mm. Self Q-switched laser pulse at 532 nm with high peak power of 96 W, pulse width of 88 ns at FWHM and repetition rate of 400 kHz was achieved. Experimental studies of a passive Q-switched Nd:YVO4 laser using Cr:YAG crystal with three different transmissions of 30%, 40% and 70% were investigated. Passive Q-switched laser pulse at 1064 nm and narrow line width of less than 1.5 nm with highest peak power of nearly 18 kW, short pulse width of less than 4 ns at FWHM and higher repetition rate of 45 kHz using Cr:YAG with transmission of 30% was achieved for the first time.
文摘Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>2</sub>. Both are hi-tech products marketed by the Fujian Castech Crystals Inc., a business entity affiliated to the CAS. The successful development of the two was honoured with a special prize, a first-grade prize and a second-grade prize of the CAS Awards for S&T Progress in 1986, 1989 and 1990 respectively. Also, they were crowned with a prize of the
