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  2. Laser diffraction analysis - Wikipedia

    en.wikipedia.org/wiki/Laser_diffraction_analysis

    Laser diffraction analysis is originally based on the Fraunhofer diffraction theory, stating that the intensity of light scattered by a particle is directly proportional to the particle size. [4] The angle of the laser beam and particle size have an inversely proportional relationship, where the laser beam angle increases as particle size ...

  3. Optical storage - Wikipedia

    en.wikipedia.org/wiki/Optical_storage

    This used a laser to warm the storage media so that it became susceptible to magnetic fields and an electromagnet, similar to the one in a hard drive, to write data by realigning the material within. It worked like a conventional optical drive during reads, with the laser operating at lower energy levels, too low to heat the disk.

  4. Optical spectrometer - Wikipedia

    en.wikipedia.org/wiki/Optical_spectrometer

    In the mid- to far-IR, spectra are typically expressed in units of Watts per unit wavelength (μm) or wavenumber (cm −1). In many cases, the spectrum is displayed with the units left implied (such as "digital counts" per spectral channel). A comparison of the four abscissa types typically used for visible spectrometers.

  5. Ultrafast laser spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Ultrafast_laser_spectroscopy

    A dye laser is a four-level laser that uses an organic dye as the gain medium. Pumped by a laser with a fixed wavelength, due to various dye types you use, different dye lasers can emit beams with different wavelengths. A ring laser design is most often used in a dye laser system.

  6. Frequency comb - Wikipedia

    en.wikipedia.org/wiki/Frequency_comb

    A frequency comb or spectral comb is a spectrum made of discrete and regularly spaced spectral lines.In optics, a frequency comb can be generated by certain laser sources.. A number of mechanisms exist for obtaining an optical frequency comb, including periodic modulation (in amplitude and/or phase) of a continuous-wave laser, four-wave mixing in nonlinear media, or stabilization of the pulse ...

  7. Optical disc - Wikipedia

    en.wikipedia.org/wiki/Optical_disc

    Most first-generation disc devices had an infrared laser reading head. The minimum size of the laser spot is proportional to the wavelength of the laser, so wavelength is a limiting factor upon the amount of information that can be stored in a given physical area on the disc. The infrared range is beyond the long-wavelength end of the visible ...

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