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  2. Optical tweezers - Wikipedia

    en.wikipedia.org/wiki/Optical_tweezers

    Ray optics explanation (focused laser). In addition to keeping the bead in the center of the laser, a focused laser also keeps the bead in a fixed axial position: The momentum change of the focused rays causes a force towards the laser focus, both when the bead is in front (left image) or behind (right image) the laser focus.

  3. Harvey L. Berger - Wikipedia

    en.wikipedia.org/wiki/Harvey_L._Berger

    Harvey Berger (August 30, 1938 – August 2007) was a scientist and inventor. He invented the modern commercial ultrasonic nozzle, which in its application has brought many benefits to the fields of research, combustion and manufacturing. Berger founded Sono-Tek Corporation based on this technology and while working at the company he made ...

  4. Liquid-crystal laser - Wikipedia

    en.wikipedia.org/wiki/Liquid-crystal_laser

    A liquid-crystal laser is a laser that uses a liquid crystal as the resonator cavity, allowing selection of emission wavelength and polarization from the active laser medium. The lasing medium is usually a dye doped into the liquid crystal.

  5. Claire Berger - Wikipedia

    en.wikipedia.org/wiki/Claire_Berger

    Claire Berger is a French physicist at the Georgia Institute of Technology and a Director of Research at the French National Centre for Scientific Research.Berger has co-authored about 200 publications in international journals and has a citation index of 10,880.

  6. Rayleigh length - Wikipedia

    en.wikipedia.org/wiki/Rayleigh_length

    Gaussian beam width () as a function of the axial distance .: beam waist; : confocal parameter; : Rayleigh length; : total angular spread In optics and especially laser science, the Rayleigh length or Rayleigh range, , is the distance along the propagation direction of a beam from the waist to the place where the area of the cross section is doubled. [1]

  7. Distributed-feedback laser - Wikipedia

    en.wikipedia.org/wiki/Distributed-feedback_laser

    A distributed-feedback laser (DFB) is a type of laser diode, quantum-cascade laser or optical-fiber laser where the active region of the device contains a periodically structured element or diffraction grating. The structure builds a one-dimensional interference grating (Bragg scattering), and the grating provides optical feedback for the

  8. Optical cavity - Wikipedia

    en.wikipedia.org/wiki/Optical_cavity

    Types of two-mirror optical cavities, with mirrors of various curvatures, showing the radiation pattern inside each cavity. Light confined in a resonator will reflect multiple times from the mirrors, and due to the effects of interference, only certain patterns and frequencies of radiation will be sustained by the resonator, with the others being suppressed by destructive interference.

  9. Laser safety - Wikipedia

    en.wikipedia.org/wiki/Laser_safety

    A laser warning symbol. Laser radiation safety is the safe design, use and implementation of lasers to minimize the risk of laser accidents, especially those involving eye injuries. Since even relatively small amounts of laser light can lead to permanent eye injuries, the sale and usage of lasers is typically subject to government regulations.