Our Laser & LED Sources
The term laser is an acronym formed from the term "Light Amplification by Stimulated Emission of Radiation". Laser light is a form of non-ionizing radiation. The laser material produces and amplifies a type of light that has properties that cannot be obtained in any other way. The light generated by the laser is monochromatic, i.e. of a single colour corresponding to a specific wavelength. Light from other sources consists of a combination of colours corresponding to various wavelengths.
Another property of lasers is that they are a source of coherent light, i.e. they produce monochromatic light in which the light particles, or photons, all move in the same direction. The result is a highly focused (collimated) beam that does not diverge like the light beam from a flashlight. Because light can converge into a very narrow beam, it has a very powerful energy flow per unit area. These properties allow the laser to produce a powerful beam that can even cut through metal. Lasers are also used in medicine to cut tissue, seal an incision or perform surgery.
Lasers can be divided into 3 main categories: solid, gas and liquid. The optimal type of laser differs depending on the treatment application. Below are the different ranges of laser and LED sources we offer:
Diode Lasers Diode-pumped solid-state lasers (DPSS) are solid-state lasers manufactured by combining a solid-gain medium with a laser diode. DPSS lasers have advantages of compactness and efficiency over other types, and high-power DPSS lasers have replaced ion and flash-pumped lasers in many scientific applications.
Solid state lasers The excited medium of solid-state lasers is a glass or crystal doped with an ion, which will determine the wavelength produced. Many variants exist or have existed. Chromium-doped ruby (Cr4+) is the material of the first laser, which operated in pulses. Garnet is used for YAG (Yttrium Aluminium Garnet) lasers. Various rare earths have been exploited. Capable of emitting from infrared to ultraviolet, solid-state lasers provide high power and can operate continuously or in pulse mode.
Gas lasers Gas lasers share the same pumping source: electricity. The gaseous species are brought into the excited state directly by collision with electrons or indirectly by collision with other gases, themselves electrically excited. Gas lasers cover the entire optical spectrum from ultraviolet to far infrared. However, the spectrum is not covered continuously: gas lasers emit very fine spectral lines. Among the most common gas lasers are excimers, argon ionized lasers, helium neon lasers and CO2 lasers. CO2 lasers are the only ones that are truly efficient (15% to 20% efficiency). They are used in industry for the treatment of materials. As for the others, the efficiency is well below 1%.
Fiber lasers A fibre laser is a system in which "the active gain medium is an optical fibre doped with rare earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, thulium and holmium. The fibre laser is ideally suited for annealed metal marking, metal engraving and high-contrast marking of plastics. Our Mid-IR solutions avoid 2 photon absorption and take advantage of the lower dispersion of materials in the mid-infrared to eliminate unnecessary light generation in the near-infrared.
Picosecond laser diode : Our partner designs and assembles UV, visible and near infrared picosecond laser diode modules. These picosecond pulsed diode laser modules are a family of high-performance and economical excitation sources for fluorescence lifetime measurement applications. It is also an alternative for Time Correlated Single Photon Counting (TCSPC) applications. With pulse durations typically less than 100 ps, these picosecond laser diodes are robust, easy to use and have optimized beam collimation optics.
LED / SLED sources Our LED sources (white light or multi-band) are designed for fluorescence, optogenetics, electrophysiology or high-speed microscopy applications.
A superluminescent diode (SLED) is a semiconductor light source with edge emission based on superluminescence. It combines the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. Its emission band is wide.
Quantum cascade lasers (QCL) Quantum Cascade Laser (QCL) : The Quantum Cascade Laser (QCL) is a semiconductor laser that can emit from the mid-infrared to the far-infrared. Unlike other semiconductor lasers, of the laser diode type, whose electromagnetic radiation comes from the recombination of an electron-hole pair across the gap, QCLs are unipolar and the laser emission is obtained by inter-subband transition of a quantum confinement structure, a quantum well, composed of a multitude of heterostructures.
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With over 40 years of cumulative experience in the field of optics, we strive to provide our customers with the advice and expertise on the solutions we offer to best meet their needs. You will find below the technical articles related to the laser and LED sources we offer.
Our partners and customers regularly write application notes. PHOT'Innov strives to gather these notes in order to offer you concrete examples of the use of our Laser and LED sources.