Waveplates are important optical components to control the polarization of light. Currently, they are often fabricated from uniaxial crystals, and there is no report about waveplates based on the biaxial crystals. In this work, a novel biaxial crystal MgTe 2 O 5 with a structure constructed by 0D Te 2 O 5 groups is designed and grown as waveplate materials for the first time. The exciting result is that the birefringence in the (001)-plane is smaller than 0.0028 in the range from 0.4 to 5 µm, which is significantly smaller than that of the current waveplate materials. The polarization modulations of the MgTe 2 O 5 devices working at 532 nm indicate that excellent zero-order half and quarter waveplates have been successfully prepared. In addition, achromatic waveplates used in the visible, near-infrared, and mid-infrared ranges have also been calculated. The MgTe 2 O 5 crystal not only exhibits a high laser damage threshold of up to 2.7 GW cm −2 but also shows a wide transmission range from 0.37 to 6.3 µm. These results provide an excellent waveplate crystal and explore the applications of biaxial crystals.
Dongmei Li,Chaofan Weng,Yi Ruan,Kan Li,Guoan Cai,Chenyao Song,Qiang Lin
A chiral sensor with optical rotation detection based on weak measurement for the kinetic study of sucrose hydrolysis is presented. Based on the polarization modulation to the pre-selection state, the optical rotation of chiral sample was accurately determined through the central wavelength shift of the output spectrum. With this approach, the concentration response curves of sucrose and its hydrolysis products, i.e., fructose and glucose, were experimentally obtained for the hydrolysis analysis. By collecting the output spectrum with a frequency of 100 Hz and fitting the central wavelength shift synchronously during the measurement, the sucrose hydrolysis process was monitored in real time. Different hydrolysis conditions with varied concentration of invertase enzyme and citrate were implemented in this work. As a consequence, the real-time hydrolysis curves of the hydrolysis process with distinct velocities was achieved and analyzed. Such a kinetic monitoring about sucrose hydrolysis with optical rotation detection technology played a critical role in the researches involving sucrose, and also revealed the great potential of weak measurement in intersections, such as food safety inspection and chemical analysis.Keywords:chiral sensor;optical sensors;weak measurement;sensor systems and applications;sucrose hydrolysis
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