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  2. Strange light phenomenon seen before some earthquakes is a ...

    www.aol.com/news/strange-light-phenomenon-seen...

    Reports of “earthquake lights,” like the ones seen in videos captured before Friday’s 6.8-magnitude earthquake in Morocco, go back centuries to ancient Greece.

  3. Earthquake light - Wikipedia

    en.wikipedia.org/wiki/Earthquake_light

    Earthquake lights may be classified into two different groups based on their time of appearance: (1) preseismic earthquake light, which generally occur a few seconds to up to a few weeks prior to an earthquake, and are generally observed closer to the epicenter and (2) coseismic earthquake light, which can occur either near the epicenter ...

  4. Nd:YAG laser - Wikipedia

    en.wikipedia.org/wiki/Nd:YAG_laser

    Nd:YAG (neodymium-doped yttrium aluminum garnet; Nd:Y 3 Al 5 O 12) is a crystal that is used as a lasing medium for solid-state lasers. The dopant, neodymium in the +3 oxidation state, Nd(III), typically replaces a small fraction (1%) of the yttrium ions in the host crystal structure of the yttrium aluminum garnet (YAG), since the two ions are ...

  5. LIGO - Wikipedia

    en.wikipedia.org/wiki/LIGO

    A pre-stabilized 1064 nm Nd:YAG laser emits a beam with a power of 20 W that passes through a power recycling mirror. The mirror fully transmits light incident from the laser and reflects light from the other side increasing the power of the light field between the mirror and the subsequent beam splitter to 700 W.

  6. Chinese satellite fires green laser beams over Hawaii as ...

    www.aol.com/chinese-satellite-fires-green-laser...

    Footage of the incident shows green laser light beaming over the cloudy sky over Maunakea in Hawaii. At the time, the space agency said that the lights were thought to be from a NASA remote ...

  7. Green flash - Wikipedia

    en.wikipedia.org/wiki/Green_flash

    Green flash occurs because the atmosphere causes the light from the Sun to separate, or refract, into different frequencies. Green flashes are enhanced by mirages, which increase refraction. A green flash is more likely to be seen in stable, clear air, when more of the light from the setting sun reaches the observer without being scattered.

  8. Neodymium - Wikipedia

    en.wikipedia.org/wiki/Neodymium

    The Nd:CaWO 4 laser was developed in 1961. [67] Historically, it was the third laser which was put into operation (the first was ruby, the second the U 3+:CaF laser). Over the years the neodymium laser became one of the most used lasers for application purposes. The success of the Nd 3+ ion lies in the structure of its energy levels and in the

  9. The 1989 earthquake that rocked San Francisco, Oakland ... - AOL

    www.aol.com/news/2014-10-17-a-look-back-at-the...

    By RYAN GORMAN A massive earthquake that struck the Bay Area on October 17, 1989 forever changed the region, and potentially altered the course of baseball history. The 6.9-magnitude Loma Prieta ...

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