Amol S. Choudhary

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We demonstrate passively mode-locked Yb(3+)-doped glass waveguide lasers in a quasi-monolithic configuration with a maximum pulse repetition frequency up to 15.2 GHz. A semiconductor saturable absorber mirror (SESAM) is used to achieve stable mode-locking around 1050 nm with pulse durations as short as 811 fs and an average power up to 27 mW. Different(More)
The novel benzofused phenazine π-conjugated skeleton with a coumarin and isophoron core was synthesized, characterized, and condensed with suitably substituted active methylene compounds by classical Knoevenagel condensation reaction to obtain novel mono-styryl dyes 6a-6d. These novel styryl dyes have hue varying from yellow to violet. The geometries of the(More)
(2016). On-chip tunable microwave photonic filters with a reconfigurable bandwidth of up to 440 MHz. (2016). Tailoring of the Brillouin gain for on-chip widely tunable and reconfigurable broadband microwave photonic filters. (2015). 456-mW graphene Q-switched Yb:yttria waveguidee laser by evanescent-field interaction. (2015). 456-mW graphene Q-switched(More)
Novel phenazine containing dyes were obtained by the condensation of 5-hydroxybenzo[a]phenazine-6-carbaldehyde and 5-chloro-benzo[a]phenazine-6-carbaldehyde with 1,2-diaminobenzene. The dyes were characterized by FT-IR, 1H NMR, elemental analysis and mass spectra. The UV–vis absorption and fluorescence emission spectra of the dyes were studied in solvents(More)
5-Hydroxybenzo[a]phenazine-6-carbaldehyde was synthesized and condensed with substituted active methylene compounds to obtain four novel phenazine fused coumarin dyes. Solutions of imidazole containing dyes in various solvents exhibited yellow to orange fluorescence while benzothiazole containing dyes showed brilliant bluish green fluorescence. The dyes(More)
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