What is Crylink's 1064nm Nd YAG laser for material processing?

 An introduction of the 1064nm Nd YAG laser for material processing

When Nd:YAG crystals are used as the gain medium, the usual output wavelength in the infrared is 1064nm. Nd:YAG lasers are optically pumped lasers utilizing flash tubes or laser diodes. The 1064nm wavelength is easily absorbed by metal surfaces and has a high power density, allowing for a smaller kerf. Nd:YAG crystals are widely utilized in manufacturing because of their characteristics.

Theory

Gain medium - Nd YAG

Neodymium ions in glasses operate as a laser gain medium, and Nd:YAG crystals may absorb wavelengths of 730nm—760nm and 790nm—820nm. When Nd is pumped into excitation, it generally emits 1064nm light following a certain atomic transition. In continuous mode, the greatest output power can be 1000W, and the highest average output power can be 400W; when the pulse width is 10ns, the energy can be 1GW/cm2 after being focused. Because of the smaller kerf of Nd:YAG crystals, lasers may have shorter output wavelengths and offer more precise laser marking.

Q-switching

To enhance the output power of lasers and compress the width of laser pulses in pulsed mode, Q-switchingshould be included. Nd:YAG lasers emit light at 1064nm, which is within the spectral range of V:YAG crystals, hence V:YAG crystals are suitable for Nd:YAG lasers. Cr4+:YAG is a crystal that is used in lasers for passive Q-switching and is also a novel laser material. It is used in the 900-1200 nm and 1350-1600 nm wavelength ranges.

Reflective mirror

The power of light will be boosted by using a mirror with a high-reflective material, which can limit transmittance and allow light to reflect numerous times in the resonant cavity. Laser light is produced by a mirror with a partially reflecting coating.

Pump source

Provide energy to the laser's gain medium; the energy is absorbed by the medium, resulting in excited states. When the number of particles in one excited state surpasses the number of particles in the ground state or a less-excited state, population inversion occurs. In Nd:YAG lasers, the pump source is generally an LD or a flash lamp.

Feature

· Being easily absorbed by metal surface

· High power density

· Good welding quality

Application

Laser drilling

Nd:YAG crystals act as a gain medium for lasers, allowing them to emit laser light with a wavelength of 1064nm that is easily absorbed by metal surfaces while remaining well centered in time and space. A focusing system may increase the power density of laser light, allowing it to penetrate through a variety of materials. Nd:YAG crystals offer features that are advantageous in the manufacturing process, such as a low threshold and high heat conductivity. The metal surface readily absorbs it. A special optical system assists laser light in hitting the designated production location, focusing the laser light beams so that adequate energy is available for drilling.

Laser marking

A technique for leaving a mark on an object. The focal plane of the laser's optical system should be on the point where the laser contacts the surface. Nd:YAG crystals act as a gain medium, allowing lasers to emit laser light with a wavelength of 1064nm. This wavelength allows for the production of a light spot with a very narrow radius, which is ideal for laser marking. Cr:YAG crystals are commonly used as Q-switches to produce laser light with high peak power and small pulse width. The Cr4+:YAG crystal is a type of saturable absorber that allows it to absorb more energy within the wavelength range of 9m1.2m. Among these wavelengths, the 1.06m absorption band is the predominant absorption band induced by energy level transition.

Laser welding

Because of their great power density, Nd:YAG lasers are the most practical lasers in production. Nd:YAG lasers have a typical pulse frequency of 0.0550kHz and an average power of 2050W. Nd:YAG lasers can fuse a variety of materials ranging in thickness from a few nanometers to a few millimeters.

Verdict

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