The simulated multichannel comb filter [MCF] built on the stacking of the Fabry - Perot etalons that work in the telecommunication region between near-infra-red wavelengths (1538 −1558 nm) and (2333 - 2373 nm) has been demonstrated. Present work illustrates the dependence of defect modes produced on the stacked Fabry - Perot etalons. The FWHM of each channel is ∼0.043 picometers for the stacking of 20000 etalons. The spacing between the channels was ∼0.79 picometers and nearly uniform throughout the telecommunication band. The simulated MCF consists of ∼78 uniform channels within a range of ∼0.1 nm centered at 1550 nm.
We report on simulated temperature-tunable single-channel/multichannel transmission filters in the infrared region (1300 nanometers -1650 nanometers) using a one-dimensional photonic crystal structure. A single channel can be selected in the photonic bandgap region based on the thickness of the quarter-wave stacks and temperature. The transmission coefficient of the transmitted defect modes is approximately the same as that required for telecommunication. For 20000 defect layers, 600 channels were created with full width at half maximum of 0.7 picometers at the center wavelength of ~ 1550 nm and channel separation of ~0.18 nanometer between 1500 nanometers-1600 nanometers.
Samarium (Sm3+)‐doped glass has sparked a rising interest in demonstrating a noticeable emission in the range of 400–700, which is advantageous in solid‐state lasers in the visible region, colour displays, undersea communication, and optical memory devices. This study reports the fabrication of Sm3+‐doped bismuth–germanium–borate glasses were established using a standard melt‐quenching technique and inspection by absorption, steady‐state luminescence, and transient studies. The typical peaks of Sm3+ ions were detected in the visible range under 403 nm excitation. A strong emission band was detected at 599 nm that resembles the 4G5/2→6H7/2 transition of Sm3+ ions for BGBiNYSm0.5 glass. Furthermore, a reddish‐orange (coral) luminescence at 646 nm that resembles the 4G5/2→6H9/2 transition was also perceived. The stimulated emission cross‐section of 4G5/2 level for BGBiNYSm0.5 glass was 0.39 × 10−22 cm2. Lifetime of the 4G5/2 level was enhanced for the BGBiNYSm0.5 glass and decreased with an increase in active ion concentrations. The lifetime quenching of ions at the metastable state was because of energy transfer among Sm3+ ions by cross‐relaxation channels. Commission Internationale de l'Éclairage (CIE) coordinates were evaluated from the emission spectra. Moreover, all the findings recommend these glass as light‐emitting materials in the coral region at 599 nm for solid‐state lighting applications.
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