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  1. PEN - Penumbra, Inc.

    Yahoo Finance

    189.75+1.74 (+0.93%)

    at Fri, May 31, 2024, 11:20AM EDT - U.S. markets close in 4 hours 39 minutes

    Nasdaq Real Time Price

    • Open 188.55
    • High 190.57
    • Low 187.50
    • Prev. Close 188.01
    • 52 Wk. High 348.67
    • 52 Wk. Low 180.93
    • P/E 79.39
    • Mkt. Cap 7.36B
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  3. Laser pointer - Wikipedia

    en.wikipedia.org/wiki/Laser_pointer

    A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.

  4. Diode-pumped solid-state laser - Wikipedia

    en.wikipedia.org/wiki/Diode-pumped_solid-state_laser

    A diode-pumped solid-state laser (DPSSL) is a solid-state laser made by pumping a solid gain medium, for example, a ruby or a neodymium-doped YAG crystal, with a laser diode.

  5. Blue laser - Wikipedia

    en.wikipedia.org/wiki/Blue_laser

    A blue laser emits electromagnetic radiation with a wavelength between 400 and 500 nanometers, which the human eye sees in the visible spectrum as blue or violet. [1] Blue lasers can be produced by: Lasers emitting wavelengths below 445 nm appear violet, but are nonetheless also called blue lasers.

  6. List of laser types - Wikipedia

    en.wikipedia.org/wiki/List_of_laser_types

    An immense slab of "continuous melt" processed neodymium-doped laser glass for use on the National Ignition Facility. This is a list of laser types, their operational wavelengths, and their applications. Thousands of kinds of laser are known, but most of them are used only for specialized research.

  7. Laser engraving - Wikipedia

    en.wikipedia.org/wiki/Laser_engraving

    Laser engraving is the practice of using lasers to engrave an object. Laser marking, on the other hand, is a broader category of methods to leave marks on an object, which in some cases, also includes color change due to chemical/molecular alteration, charring, foaming, melting, ablation, and more.

  8. Laser safety - Wikipedia

    en.wikipedia.org/wiki/Laser_safety

    In the period from 1999 to 2016, increasing attention has been paid to the risks posed by so-called laser pointers and laser pens. Typically, the sale of laser pointers is restricted to either class 3A (<5 mW) or class 2 (<1 mW), depending on local regulations.