Santosh Das
@omdayal.com
Assistant Professor Department of Computer Science Engineering
OMDAYAL GROUP OF INSTITUTION
RESEARCH INTERESTS
IoT Machine Learning Edge AI
Scopus Publications
Scopus Publications
S. Das
Springer Science and Business Media LLC
S. Das, K. C. Bahuguna, and V. Kumar
Springer Science and Business Media LLC
Subhasis Das
IOP Publishing
Efficient continuous wave tunable mid-infrared radiation by the process of second harmonic generation of tunable CO2 laser radiation using a CdGeAs2 (CGA) crystal has been reported. Its phase matched angular tuning characteristic at the CO2 laser wavelength, phase matched angular acceptance and spectral acceptance have been measured. Considering effective figure of merit, CGA crystal has been found to be 90 times more efficient than ZnGeP2 crystal at 10.6 µm.
S Das
IOP Publishing
Tunable mid-IR radiation is obtained during second harmonic generation of tunable CO2-laser radiation using a CdGeAs2 crystal. Its angular tuning characteristics at the CO2- laser wavelength, angular acceptance angle and spectral acceptance are measured. For second harmonic generation at 10.6 μm, the conversion efficiency in the CdGeAs2 crystal is 90 times higher than that in the ZnGeP2 crystal.
S. Das
Springer Science and Business Media LLC
S Das
IOP Publishing
A line tunable singly resonant optical parametric oscillator in the 3–5 µm spectral range based on a KTA crystal pumped by 1.064 µm radiation from a Q-switched multi-axial Nd : YAG laser has been demonstrated. Thresholds of oscillation energy at different cavity lengths and at different idler wavelengths using gratings with different rulings have been measured. Energy of the generated radiation at 3.6 µm and conversion efficiency at different pump beam energies have also been measured.
S. Das
Institute of Electrical and Electronics Engineers (IEEE)
Line-tunable narrow-linewidth mid-infrared radiation in 3-5-mum spectral range by singly resonant optical parametric oscillation technique based on a KTA crystal pumped by 1.064-mu m radiation from a Q-switched Nd:YAG laser using different gratings has been demonstrated. Thresholds of oscillation energy at different cavity lengths and at different idler wavelengths with different gratings have been measured. Energy of the generated radiation at 3.6 mum as a function of pump beam energy at different cavity lengths with different gratings have been measured. Maximum energy obtained at 3.6-mum radiation with a grating having grooves density 85 l/mm at 55-mm cavity length is 4.6 mJ when the cavity was pumped by 42.6-mJ energy, which corresponds to conversion efficiency from pump beam energy to generated idler beam energy 10.8% and maximum slope efficiency achieved was 23.6%. The linewidth obtained with a grating having grooves density 600 l/mm at 3.7 mum was 0.53 cm-1.
Gopal C. Bhar and S. Das
SPIE
Noncritical phase matched laser devices of CO2 laser radiation have been described employing weighted average technique in mixed chalcopyrites like CdGe(As(l-X)Px)2; AgGa(Se(l-X)Tex)2 and CdxHg(l-X)Ga2S4. Such type of noncritically phase matched devices have been experimentally demonstrated in AgGaIn)Se2 crystal
Gopal C. Bhar, S. Das, Yuri M. Andreev, Pavel P. Geiko, and Valery V. Badikov
SPIE
Growth and nonlinear optical properties of HgGa2S4 and mixed chalcopyrite Cd4Hg06Ga2S4 & AgGaGeS4 crystals have beenreported. Sellmeier coefficients have also been developed from the measured refractive indices in all these crystals. Nonlinearlaser device application has also been explored.Keywords: Nonlinear material, tunable laser device, Sellmeier coefficients, chalcopyrite crystal
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