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What is laser technology?

Principle of laser technology

A laser (coherent and monochromatic) wave is generated in an excited laser source and its gradual accumulation leads to a significant energetic power. After the amplification its exit from the laser sourcetakes place in form of a laser beam. The laser beam properties are refined by passing it through special optical components. This modified laser beam, additionally focused through a lens, then enters the workspace.

Adavantages of Laser technology:

  • top quality and accuracy
  • reproducibility
  • speed
  • high flexibility
  • usable for almost any material
  • contactless and clean processing
  • can be easily  integrated into the production
  • process precision
  • reduction of production costs
  • minimal environmental effects
  • no consumables
  • long life cycle

 

The word laser is an english acronym which stands for "Light Amplification by Stimulated Emission of Radiation". Light is amplified by repeatedly passing photons through a medium with specific properties.

A laser is an optical source of electromagnetic radiation (light). When the laser light is emitted in the form of a narrow beam it has - unlike natural light sources - definitive specific properties: consistency (waves of the same frequence, the direction of oscillation and phase) and monochromaticity (precisely defined wavelength).

Not too long ago laser technology was not seriously considered to be a technology usable for routine use in industry. However, it has gradually gained wider posibillities of being utilized in almost all areas of industrial production. Using the unique properties of laser radiation can further streamline a number of applications to achieve top quality and reduce production costs. Today's laser systems are practically trouble-free. They can be considered  the most stable elements of production lines. Each system has, due to its parameters, different strengths and applications for use.

Overview of industrial laser use:

Uses of lasers in Lintech:

 

Which materials can be processed at the different processes?

Laser marking metal, aluminum, plastics (and composites), glass, wood, leather, ceramics
Laser welding metals, plastics
Laser engraving steel, structural steel, copper, brass, dual-layer plastics, dual-layer self-adhesive foil, wood, glass, anodized aluminum
Laser welding (material addition) metals, plastics
Laser cutting metals, plastics
Laser drilling metals, plastics

 

Lasers and safety

Class 1

These lasers operate in conditions of high probability of safety. The beam can be monitored using optical devices. There is no specified maximum time of radiation exposure, this includes highly-performance lasers, which have their radiation shielded from the surroundings. If the shield (or cover) is removed then the laser system automatically shuts down.

Class 1M

Lasers emitting wavelengths of 302.5 nm to 4000 nm are also statisticaly safe in operating conditions, but can be dangerous when using optical devices for tracking the beams. Class 1M lasers have a total output power under that of Class 3B, but its power, which is able to pass through the retina, belongs to Class 1.

Class 2

For lasers emitting wavelengths of 400 nm to 700 nm the human blink reflex limits the exposure to bright light to no longer than 0.25 seconds (deliberate blink suppression could result to eyesight damage). This reaction can be regarded as sufficient to ensure an adequate protection in normal operating conditions to a sufficiently high probability. This includes the use of optical devices for tracking inside the beam. Class 2 lasers are limited to an output value of 1 mW in continuous mode. The output power value can be increased if the radiation time is not longer than 0.25 seconds or the radiation is not spatially coherent. Most laser pointers belong in this class.

Class 2M

Lasers emitting visible radiation of wavelengths of 400 nm to 700 nm. Normal human blink reflex is sufficiently fast to provide protection. However, the laser output monitoring can be more dangerous when using optical devices for tracking inside the beam. Lasers with a large beam cross-section or a large divergence belong in this class. Light passing through the eye pupil must not exceed Class 2 limits.

Class 3R

Lasers emitting wavelengths of 302.5 nm to 106 nm. The direct tracking inside the beam is potentially dangerous, but the risk is lower than of Class 3B lasers. There are fewer manufacturing requirements and control values for users than for Class 3B lasers. The permissible radiation limit (AEL) is five times greater than that of Class 2 or Class 1. The maximum power output for Class 3R lasers operating in visible wavelengths and in continuous mode is 5mW. There are different limits for pulse modes and other wavelengths.

Class 3B

These lasers are considered dangerous if there is a direct beam radiation (eye injury hazard at close range). Diffused reflection monitoring is safe under normal conditions. The power output is limited to 0.5 W for lasers operating in continuous mode and in the wavelengths of 315nm to the far infrared. The power output is limited to a 30mJ pulse for pulsed lasers with wavelengths 400 - 700nm (visible light).

Class 4

Direct laser radiation causes severe eye injury with permanent and severe eyesight impairment. Diffused reflection is also dangerous in cases of non-observance of the minimum safe distance criteria. Class 4 lasers can cut and burn skin severely. Combustible materials can be ignited. Lasers with higher performance or higher pulse energy than Class 3B lasers are all included into Class 4.

 

 

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Further contacts


Contact

  • LINTECH, spol. s r.o.
  • Žižkova 16, 344 01 Domažlice
  • IČ: 47717076, DIČ/VAT: CZ47717076
  • Tel.: (+420) 379 807 211
  • Fax: (+420) 379 807 210
  • E-mail: info@lintech.cz

The other contacts


Interesting facts about Lintech:

  • Lintech, spol. s.r.o. was founded in 1993
  • Currently we have approx. 130 employees
  • We have a team of highly professional experts with longtime experience in the field of laser technology working in our company
  • We have been partner of the Centrum of laser technology and automatization at the University of West Bohemia in Pilsen since 2009
  • We are always focused on acquiring new knowledge in terms of laser technology, cooperating with our foreign partners

Actuality

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