Notes

Exploring the affiliation involving rounded economy tactics and eco-friendly careers in Western european businesses.
75 dB, and a -10 dB RCS reduction characteristic in the wide band of 6∼20.7 GHz with a fractional band of 110%.In order to increase the number of detectable gravitational-wave sources, future gravitational-wave detectors will operate with cryogenically cooled mirrors. However, recent studies showed that cryogenic mirrors can suffer from the molecular layer formation, which introduces an additional optical loss, and the detector's performance degrades. In order to evaluate the impact of the molecular layer on future cryogenic gravitational-wave detectors, we built a cryogenic folded-cavity setup and developed an ellipsometric measurement method. The optical loss induced by the cryogenic molecular layer shows a large value even at a few nanometer thickness and can deteriorate the performance of the future cryogenic gravitational-wave detectors.In this paper, we realize a wideband fiber-optic Fabry-Perot (F-P) acoustic sensing (FPAS) scheme by utilizing a high-speed absolute cavity length demodulation with a 70-kHz maximum line rate spectrometer. The wideband FPAS is made of a pre-stress stainless-steel diaphragm based on F-P interferometric structure. The real-time absolute F-P cavity lengths are calculated by a phase demodulation method, which is realized by processing the interference image at a 70-kHz frame rate. Acoustic signal is obtained by extracting the AC component of the demodulated cavity length. The experimental results show that the spectrometer can be running at a 50-kHz line rate, and an acoustic detection wideband of 20 Hz to 20 kHz is obtained. The noise-limited minimum detectable sound pressure level is 18.8 dB, which is sensitive enough for the communication of human voice. The proposed wideband acoustic sensing scheme achieves good robustness, which is promising as a speech-sound microphone for communication during the magnetic resonance imaging procedure.Temperature crosstalk has always been a critical problem for fiber intermodal sensors. In this work, we have proposed a novel method based on the special temperature response of photosensitive fiber to control the temperature sensitivity of the fiber intermodal sensor. The control of temperature sensitivity has been realized via adjusting the proportion of photosensitive fiber to single-mode fiber in the sensing part. The temperature sensitivity as high as -192 pm/°C, and as low as -2.6 pm/°C can be obtained, satisfying the demand in both research and application. The torsion sensor is taken as an example to illustrate feasibility of this method, showing no evident interference in the measurement of torsion parameters. The proposed method outstrips the conventional one by simple structure, facile manufacture, multiple use and low cost, which brings great promise for further employment in laboratory and industry.With the rapid development of space division multiplexing (SDM) and flexible grid technology, the problem of resource allocation in optical network becomes much more complicated. Although there emerge a substantial number of works about link protection or restoration in SDM-EONs mesh networks, the topic of survivability is dug deeper in this work. It is acknowledged that protection schemes based on ring covers bring the advantages of shorter restoration time and lower costs. However, the RSCA problem in SDM-EON for link protection based on ring covers has rarely been investigated. To enhance the survivability of SDM-EON and make the best use of ring covers, we initially select a set of rings for the protection of all the links in a network topology according to constrains, aiming at taking full advantages of network resources. Birinapant After that, we propose an algorithm to recover the traffic which will break off under link failures, basing on the set of rings. At the end of this protection scheme, we arrange the resources fulfilling the constrains of spectrum contiguity and core continuity constrains by using several different algorithms considering physical impairment. Based on the allocation in both spacial and spectral dimensions, our algorithms achieve better results of survivability. According to the simulations conducted for the evaluation of the proposed algorithms, our algorithms manage to recover at least 72.8% of traffic when the traffic request number is set to be 1000.A dynamic sampling iterative phase retrieval method, which dynamically samples the Fourier intensity distribution of the reconstruction beam captured by the detector, is proposed to shorten the iterative number and decrease the phase error rate of phase retrieval in the phase-modulated holographic data storage. By the dynamic sampling method, that keeping relatively low frequency component of Fourier intensity spectrum at the beginning of iteration and gradually releasing more high frequency component at the subsequent iterations, we shortened the iterative number by 2 times and decreased the phase error rate to some extent because our method provided a better convergent path to the phase retrieval. We also believe the thought of our method can be used in more image retrieval fields.In this study, the optimal condition of a multi-plate birefringent filter (BRF) used in a single-frequency continuous-wave (CW) tunable laser is theoretically and experimentally investigated. The dependence of the optimal condition on the diving angle of the BRF optical axis is first deduced. Based on the proposed optimal condition, the diving angle of the BRF optical axis is optimized to 29.1°. Subsequently, a novel off-axis multi-plate BRF with a thickness ratio of 1259 and the thinnest plate of 0.5 mm is designed and utilized in a tunable titaniumsapphire (TiS) laser. As a result, the operating wavelength of the TiS laser is successfully tuned from 691.48 to 995.55 nm by rotating the BRF 18°. The obtained tuning slope efficiency and maximum tuning range are 16.9 nm/° and 304.07 nm, respectively. The experimental results agree well with the theoretical analysis results, which provide a feasible approach for designing BRFs to satisfy the requirements of other single-frequency CW wideband tunable lasers.
Homepage: https://www.selleckchem.com/products/birinapant-tl32711.html