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  2. 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.

  3. Blue laser - Wikipedia

    en.wikipedia.org/wiki/Blue_laser

    Blue, direct diode semiconductor lasers can be built using inorganic gallium nitride (GaN) or InGaN gain medium, upon which many (dozens or more) layers of atoms are placed to form the active part of the laser that generates photons from quantum wells.

  4. List of pen types, brands and companies - Wikipedia

    en.wikipedia.org/wiki/List_of_pen_types,_brands...

    A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. Additional types of specialized pens are used in specific types of applications and environments such as in artwork , electronics , digital scanning and spaceflight , and computing.

  5. Officially, the 13 Best Pens of All Time - AOL

    www.aol.com/lifestyle/officially-13-best-pens...

    Pens don't just need to function well, they need to look good. These are our 13 favorite pens. From Montblanc to Pilot, these are the ones the absolute best.

  6. 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.

  7. Dye laser - Wikipedia

    en.wikipedia.org/wiki/Dye_laser

    A dye laser is a laser that uses an organic dye as the lasing medium, usually as a liquid solution. Compared to gases and most solid state lasing media, a dye can usually be used for a much wider range of wavelengths, often spanning 50 to 100 nanometers or more.