The purpose of quartz homeotypes grown epitaxially on beta quartz for use in pressure sensors or accelerometers is to be able to drastically cut down production costs on otherwise expensive or time-consuming to grow crystals that are necessary in various industrial applications. This is done via epitaxial growth of quartz homeotypes across the whole surface of a sample of beta quartz, an easily accessible and high temperature capable crystal. This invention also applies to the epitaxial application of piezoelectric material atop a piezoelectric crystal for the purpose of altering its piezoelectric coefficient and the epitaxial application of a piezoelectric crystal atop a host crystal for the purpose of increasing its insulation resistance.

The purpose of quartz homeotypes grown epitaxially on beta quartz for use in pressure sensors or accelerometers is to be able to drastically cut down production costs on otherwise expensive or time-consuming to grow crystals that are necessary in various industrial applications. This is done via epitaxial growth of quartz homeotypes across the whole surface of a sample of beta quartz, an easily accessible and high temperature capable crystal. This invention also applies to the epitaxial application of piezoelectric material atop a piezoelectric crystal for the purpose of altering its piezoelectric coefficient and the epitaxial application of a piezoelectric crystal atop a host crystal for the purpose of increasing its insulation resistance.

The present disclosure provides a potassium dihydrogen phosphate (KDP) frequency-doubling crystal structure, including a crystal fixing structure, a KDP crystal, a ? polarization tube, and a ? polarization tube; where a ?-polarized laser with a central wavelength of 800 nm enters the KDP crystal through the ? polarization tube, and the KDP crystal converts the ?-polarized laser with a central wavelength of 800 nm into a ?-polarized laser with a central wavelength of 400 nm by frequency doubling and then outputs the ?-polarized laser from the ? polarization tube. Close end bevels of the ? polarization tube and the ? polarization tube are designed into a Brewster angle. The KDP crystal is placed in a vacuum-sealed cavity formed by the ? polarization tube, the ? polarization tube, and the crystal fixing structure, which eliminates a complicated process of crystal coating and prevents the KDP crystal from deliquescing in air.

The present disclosure provides a potassium dihydrogen phosphate (KDP) frequency-doubling crystal structure, including a crystal fixing structure, a KDP crystal, a ? polarization tube, and a ? polarization tube; where a ?-polarized laser with a central wavelength of 800 nm enters the KDP crystal through the ? polarization tube, and the KDP crystal converts the ?-polarized laser with a central wavelength of 800 nm into a ?-polarized laser with a central wavelength of 400 nm by frequency doubling and then outputs the ?-polarized laser from the ? polarization tube. Close end bevels of the ? polarization tube and the ? polarization tube are designed into a Brewster angle. The KDP crystal is placed in a vacuum-sealed cavity formed by the ? polarization tube, the ? polarization tube, and the crystal fixing structure, which eliminates a complicated process of crystal coating and prevents the KDP crystal from deliquescing in air.

A composite material includes: an apatite crystal in the form of a tube; and a functional component accommodated in the apatite crystal tube and constituted by a material having physical properties different from those of the apatite crystal. The apatite crystal may be a monocrystal given by the general formula M.sup.2.sub.5(PO.sub.4).sub.3X, where M.sup.2 denotes at least one element selected from the group consisting of divalent alkali earth metals and Eu, and X denotes at least one element or molecule selected from the group consisting of halogens and OH.

A composite material includes: an apatite crystal in the form of a tube; and a functional component accommodated in the apatite crystal tube and constituted by a material having physical properties different from those of the apatite crystal. The apatite crystal may be a monocrystal given by the general formula M.sup.2.sub.5(PO.sub.4).sub.3X, where M.sup.2 denotes at least one element selected from the group consisting of divalent alkali earth metals and Eu, and X denotes at least one element or molecule selected from the group consisting of halogens and OH.

A fluorescent member includes: a wavelength converter including an incidence part on which a light of a light source is incident and an output part from which a converted light subjected to wavelength conversion as a result of excitation by an incident light is output; and a reflecting part provided in at least a portion of a surface of the wavelength converter. The wavelength converter is comprised of a material whereby a degree of scattering of the light of the light source incident via the incidence part and traveling toward the output part is smaller than in the case of a polycrystalline material.

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/m.sup.2 or greater.

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/m.sup.2 or greater.

Disclosed is a nonlinear optical (NLO) material for use in deep-UV applications, and methods of fabrication thereof. The NLO is fabricated from a plurality of components according to the formula A.sub.qB.sub.yC.sub.z and a crystallographic non-centrosymmetric (NCS) structure. The NLO material may be fabricated as a polycrystalline or a single crystal material. In an embodiment, the material may be according to a formula Ba.sub.3ZnB.sub.5PO.sub.14.