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Nd (Neodymium) – YAG (Yttrium Aluminium Garnet) LASER Principle Characteristics

Nd (Neodymium) – YAG (Yttrium Aluminium Garnet) LASER Principle Characteristics.

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Nd (Neodymium) – YAG (Yttrium Aluminium Garnet) LASER Principle Characteristics

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  1. Nd (Neodymium) – YAG (Yttrium Aluminium Garnet) LASERPrincipleCharacteristics Doped Insulator laser refers to yttrium aluminium garnet doped with neodymium. The Nd ion has many energy levels and due to optical pumping these ions are raised to excited levels. During the transition from the metastable state to E1, the laser beam of wavelength 1.064μm is emitted

  2. M1– 100% reflector mirror M2 – partial reflector mirror Laser Rod Flash Tube Resistor Nd (Neodymium) – YAG (Yttrium Aluminium Garnet) LASER Capacitor Power Supply

  3. E3 Non radiative decay E2 E4 Laser 1.064μm E1 Non radiative decay E0 Nd E1, E2, E3 – Energy levels of NdE4 – Meta Stable StateE0 – ground State Energy LevelApplicationsTransmission of signals over large distancesLong haul communication systemEndoscopic applicationsRemaote sensing Energy Level Diagram of Nd– YAG LASER

  4. Carbon Di Oxide LASERPrincipleThe transition between the rotational and vibrationalenergy levels lends to the construction of a molecular gas laser.Nitrogen atoms areraised to the excited state which in turn deliver energy to the CO2 atoms whose energy levels are close to it. Transition takes place between the energy levels of CO2 atoms and the laser beam is emitted.

  5. Applications • Bloodless surgery • Open air communication • Military field

  6. HOMOJUNCTION SEMICONDUCTOR LASER(Ga-As Laser) Principle • The electron in the conduction band combines with a hole in the valence band and the recombination produces radiant energy. This photon induces another electron in the CB to combine with a hole in the VB and thereby stimulate the emission of another photon.

  7. Applications • Compact & used in fibre optic communications • CD writer • Relieves pain • Laser printers

  8. Principle Two beams (object beam and reference beam) are superimposed on a holographic plate to form an image called a hologram.

  9. Principle A beam of light (reading beam) having the same wavelength as that of the reference beam used for constructing the hologram, is made to fall over the hologram, which in turn gives rise to a 3-D image in the field of view.

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