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  2. Crystal Light - Wikipedia

    en.wikipedia.org/wiki/Crystal_Light

    In fact, all Crystal Light Energy flavors contain this same amount of caffeine. [18] Certain other Crystal Light flavors have long included caffeine as an ingredient. The label of Crystal Light Peach Iced Tea, for instance, says that the flavor contains "25mg caffeine per serving," or about as much an eight-ounce (240 mL) cup of black tea.

  3. Thermoluminescent dosimeter - Wikipedia

    en.wikipedia.org/wiki/Thermoluminescent_Dosimeter

    When a thermoluminescent crystal is exposed to ionizing radiation, it absorbs and traps some of the energy of the radiation in its crystal lattice. When heated, the crystal releases the trapped energy in the form of visible light, the intensity of which is proportional to the intensity of the ionizing radiation to which the crystal was exposed.

  4. Spontaneous parametric down-conversion - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_parametric...

    Schematic of SPDC process. Note that conservation laws are with respect to energy and momentum inside the crystal.. Spontaneous parametric down-conversion (also known as SPDC, parametric fluorescence or parametric scattering) is a nonlinear instant optical process that converts one photon of higher energy (namely, a pump photon) into a pair of photons (namely, a signal photon, and an idler ...

  5. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Energy, as a scientific term, is a very well-defined concept that is readily measurable and bears little resemblance to the esoteric concept of energy used by proponents of crystal healing. [22] In 1999, researchers French and Williams conducted a study to investigate the power of crystals compared with a placebo.

  6. Photonic crystal - Wikipedia

    en.wikipedia.org/wiki/Photonic_crystal

    Although the energy of light (and all electromagnetic radiation) is quantized in units called photons, the analysis of photonic crystals requires only classical physics. "Photonic" in the name is a reference to photonics , a modern designation for the study of light ( optics ) and optical engineering.

  7. Nonlinear optics - Wikipedia

    en.wikipedia.org/wiki/Nonlinear_optics

    Structure of KTP crystal, viewed down b axis, used in second harmonic generation.. Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light.

  8. Triboluminescence - Wikipedia

    en.wikipedia.org/wiki/Triboluminescence

    It is the emission of light from the fracture (rather than rubbing) of a crystal, but fracturing often occurs with rubbing. Depending upon the atomic and molecular composition of the crystal, when the crystal fractures, a charge separation can occur, making one side of the fractured crystal positively charged and the other side negatively charged.

  9. Phosphor - Wikipedia

    en.wikipedia.org/wiki/Phosphor

    A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or visible light, and cathodoluminescent substances which glow when struck by an electron beam ( cathode rays ...