Skip to main content

What is Nd YAG

Nd YAG, completely known as neodymium-doped yttrium aluminum garnet crystal (Nd: Y3Al5O12), yttrium aluminum garnet crystal as its activator, the content of Nd atoms in the crystal is 0.6 ~ 1.1%, belongs to the solid laser, can excite pulse laser or continuous laser, releasing laser infrared wavelength 1.064 μm.

Short pulse Nd YAG laser has vital applications in laser processing, photoelectric countermeasures, laser varying, laser communication, and so on. Especially the peak power laser acquired by Q switching is the core gadget in lots of innovative clinical research and also contemporary clinical tools as well as devices.

Neodymium-doped yttrium aluminum garnet (Nd: YAG) laser crystal has the advantages of excellent optical harmony, mechanical properties, high physical and chemical security, great thermal conductivity, and so forth. It has become the major assistance product for military solid laser technology as well as the application direction of medium and high-power lasers. It is known as among the “3 basic laser crystal products”, which is commonly made use of in industrial, medical, military, and clinical research.


Crylink Nd: YAG crystal is still the most widely made use of solid laser medium as a result of its exceptional optical and also mechanical properties, simple manufacturing, and inexpensive. Nonetheless, the study mainly focuses on the 946nm, 1064nm, and also 1319nm wavelength lasers, as well as the 1123nm laser discharge is likewise a crucial transition.

Nd: YAG crystals have superior spooky and laser properties. It is one of the most commonly utilized laser crystals. With Nd YVO4

Compared with crystal, the previous has high thermal conductivity, great mechanical properties, as well as very easy development, and also Nd: YAG crystal can be utilized straight; Cr YAG Q modulation to get peak power and also high repetition frequency result. However, because the doping concentration of Nd: YAG crystal is reduced and the absorption coefficient is tiny, it is challenging to understand the miniaturization of the laser and also enhance its efficiency. We have now gotten big, very drugged Nd: YAG crystals utilizing the cozy ladder technique, with the mole fraction of Nd ions doped up to 2.3.

Growth method of Nd YAG crystal

Lifting method

Tira method: Czochralsik: CZ technique, a crystal growth technique developed by Czochralsik in 1917

Standard concept: Under a reasonable temperature level field, the reduced end of the seed crystal set up on the seed crystal rod is lowered right into the raw material of the thaw. Under the activity of the rotary electric motor and training system, the seed crystal rod turns while slowly drawing upward. After several technological phases, such as neck shrinking, shoulder growth, shoulder turning, equivalent diameter, completing, and also pulling off, the solitary crystal with certified geometric form and inner high quality is expanded.

Advantages of the pulling method:

  • During the growth process, it is convenient to observe the growth of the crystal
  • The growth of the crystal on a free surface area of the thaw without contact with the crucible significantly decreases the tension on the crystal and avoids nucleation on the crucible wall surface
  • It is easy to use orientated seed crystals as well as the “necking” procedure to obtain total seed crystals as well as crystals of the preferred alignment. The great benefit of the pull-up method is the capability to grow crystals of higher quality at a much faster price


  • Possible contamination of the crystal by crucible product;
  • The thaw’s circulation action, the transmission’s vibration, as well as the temperature change all affect the crystal’s quality.

Bridgman method

Bridgman process is a common melt growth technique, typically split into upright as well as straight Bridgman procedure two.

The vertical Bridgman process, likewise referred to as the crucible descent technique, is a technique of expanding crystals from melt. Usually, when the crucible is reduced in a crystallizing heater and passes through a region with a large temperature slope, the melt crystallizes in the crucible from the bottom up right into a single crystal. The formation furnace rising along the crucible can likewise complete this procedure.

Guided temperature slope technique

The directed temperature level ladder method is a solitary formation method of melt induced by related seed crystals. The temperature level area of TGT is mainly adjusted by readjusting the shape and position of the graphite home heating body, Mo insulation display, Mo crucible, the power of the home heating body, as well as the circulation of flowing cooling water to form a suitable temperature slope from all-time low to top

Main application of Nd YAG laser

The Nd: YAG laser has a wavelength of 1064 nm as well as is not near the absorption optimal of oxygenated hemoglobin, which has bad Nd: YAG laser absorption. However, its penetration deepness can get to about 8 mm, to ensure that it can play a healing duty in the deeper part of the hemangioma. According to the various energy result modes, Nd: YAG laser can be separated right into continuous and also pulse kind 2. Continuous Nd: YAG lasers are commonly made use of but are non-selective in thermal cells damage.

Continuous Nd: YAG laser is extensively made use of in the ent division, gynecology and also surgical procedure. And in dermatology, due to the “bad cosmetic result”, use is extra careful. Compared with constant Nd: YAG laser, pulsed Nd: YAG laser is extra regular with selective photothermal concept. It can reduce warm damages to the bordering regular cells and reduce the event of marks as well as other unfavorable reactions.

Leave a Reply