Faraday effect and the modulation of infrared radiation in iron garnets

Abstract

The amplified spontaneous emission properties of a 2, 1, 3-benzothiadiazole attached polyfluorene semiconductor polymer were studied. The conjugated polymer shows a high photoluminescence quantum efficiency of 67% and emits a narrowed blue emissive spectrum with a full width at half-maximum of 3.6 nm when optically pumped, indicating better lasing action. A threshold energy as low as 0.22 mJ pulse −1 cm −2 , a net gain of 40.54 cm −1 and a loss of 7.8 cm −1 were obtained, demonstrating that this conjugated polymer could be a promising candidate as the gain medium for the fabrication of blue polymer lasers.

Dynamics of domain walls in orthoferrites in the light of results obtained for ferrite-garnet films

“…The goal of the present investigation is to demonstrate that there is no contradiction between the results in [24] and in [25][26][27][28][29][30][31][32][33][34][35][36].…”

“…In our opinion, the fact that microdomain generation ahead of moving DWs took place in [24] but not in [25][26][27][28][29][30][31][32][33][34][35][36] can be attributed to the different methods used in the dynamic experiments.…”

“…However, no microdomain generation in front of moving DWs was seen in the studies conducted by M. V. Chetkin et al [25][26][27][28][29][30][31][32][33][34][35][36] on the dynamics of DWs in yttrium orthoferrite. No explanation has yet been established for this discrepancy.…”

“…The main advantage provided by the seeming simplicity of the experiments in [25][26][27][28][29][30][31][32][33][34][35][36], involving a single DW in a constant gradient magnetic field, is that motion of the DW over a sufficiently long distance is accompanied by a change in the acting magnetic field, including the components of the field which are perpendicular to the DW (normal and parallel to the plane of the plate). This change in the field should heavily influence the generation of microdomains.…”

“…In [25][26][27][28][29][30][31][32][33][34][35][36], a study was made of the motion of a single DW aligned in 3 • 3 mm plates of orthoferrites by a constant gradient magnetic field with a gradient of 300-2000 rel. un./cm.…”