The prism is one of the most important optical components in optical system, this paper analyzes the difficulties in processing technology. The angle accuracy of prisms can be improved by using slotted flat die, metal optic tooling, glass optic tooling and optic bonding tools. In this paper, the method of obtaining angle precision of prism with different batch and different precision grade is given, it has certain guiding significance for prism machining.
In this paper, the combination of spontaneous and stimulated Raman spectroscopy is used to further explore the relationship between OH stretching vibration and hydrogen bond in water under atmospheric pressure and dynamic high pressure and present the change process of hydrogen bond structure in liquid water from a microscopic point of view. The OH spontaneous Raman spectrum of water is deconvoluted into two characteristic peaks, which are 3213 cm-1 and 3436 cm-1 respectively. They belong to the OH stretching vibration under the action of strong hydrogen bond and weak hydrogen bond. In stimulated Raman scattering, under the action of plasma shock wave, the bond length of hydrogen bond is shortened, resulting in the elongation of OH bond length. Corresponding to the enhancement of hydrogen bond, the OH stretching vibration of water is weakened, and the Raman peak moves to the low wave number direction to 3396 cm 1. In the stimulated Raman scattering experiment, due to the exponential enhancement of the output signal, the weaker vibration mode will be masked by the stronger vibration mode. Therefore, only one vibration mode is observed in the spectrum. In this paper, the changes of corresponding hydrogen bond structure under spontaneous and stimulated Raman scattering are compared and analyzed. The research results are helpful to further explore the microphysical mechanism of liquid water molecular interaction and provide a reference for the mechanism research in related fields.
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