Fiber Coupled

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Definition: diode laser devices where the generated light is coupled into an optical fiber
Alternative term: pigtailed diode lasers
German: fasergekoppelte Diodenlaser
For many applications, it is convenient to couple the output of a laser diode into an optical fiber in order to deliver the light to the place where it is needed. Fiber-coupled (also called fiber-integrated or fiber-pigtailed) diode lasers have several advantages:
Many diode lasers are thus sold in fiber-coupled form, with robust fiber coupling optics (e.g., a permanent laser-welded fiber attachment) built into the laser package. The used fibers and techniques differ very much for different diode lasers:
The simplest case is that of a VCSEL (vertical cavity surface-emitting laser), which usually emits a beam with high beam quality, moderate beam divergence, no astigmatism, and a circular intensity profile. A simple spherical lens is sufficient for imaging the emitting spot to the core of a single-mode fiber. The coupling efficiency can be of the order of 70–80%. It is also possible to couple directly (butt couple) the fiber to the emitting surface of the VCSEL.
Small edge-emitting laser diodes also emit in a single spatial mode, thus in principle also allowing efficient coupling to a single-mode fiber. However, the coupling efficiency can be significantly degraded by the ellipticity of the beam, if a simple spherical lens is used. Also, the beam divergence is relatively high in at least one direction, requiring a lens with relatively high numerical aperture. Another problem is astigmatism of the diode output, particularly for gain-guided diodes; this may be compensated with an additional weak cylindrical lens. With output powers of up to a few hundred milliwatts, fiber-coupled gain-guided LDs can be used for, e.g., pumping erbium-doped fiber amplifiers.
Broad area laser diodes are spatially multimode in the long direction of the emitter. If a circular beam is simply shaped with a cylindrical lens (e.g. a fiber lens, see Figure 3) and then launched into a multimode fiber, a lot of the brightness (radiance) will be lost, because the high beam quality in the fast axis direction can not be utilized. A power of e.g. 1 W can be launched into a multimode fiber with a 50-μm core diameter and a numerical aperture (NA) of 0.12. This is sufficient e.g. for pumping a low-power bulk laser, e.g. a microchip laser. Even a launched power of 10 W is possible.
An improved technique for broad-area lasers is based on reshaping the beam for a symmetrized beam quality (and not only symmetrized beam radius) before launching. That allows for a higher brightness.
For diode bars (diode arrays), the problem of asymmetric beam quality is even more severe. Here, the outputs of individual emitters may be coupled into separate fibers of a fiber bundle. The fibers are arranged in a linear array on the side of the diode bar, but as a circular array on the output end. Alternatively, some kind of beam shaper for symmetrizing the beam quality may be used before launching into a single multimode fiber. This can be done e.g. with a two-mirror beam shaper or with some microoptical elements. It is possible e.g. to couple 30 W into a fiber with 200-μm (or even 100-μm) core diameter and an NA of 0.22. Such a device can be used for, e.g., pumping an Nd:YAG or Nd:YVO4 laser with roughly 15 W of output power.
For diode stacks, fibers with still larger core diameters are used. It is possible e.g. to couple hundreds of watts (or even several kilowatts) of optical power into a fiber with a 600-μm core diameter and NA = 0.22.
Some potential disadvantages of fiber-coupled diode lasers, compared with free-space emitting lasers, are:
One may also not obtain a fiber-coupled laser diode product for each optical wavelength.
The beam quality of the fiber output is often not specified; in many cases, only the fiber core diameter and the numerical aperture (NA) are known, and a step-index multimode fiber is assumed. There is no equation to calculate exactly the beam quality in that case, because it depends on the distribution of optical power over the fiber modes, and this distribution itself depends on the launching conditions. However, the beam quality M2 factor can be roughly estimated, assuming that the power is well distributed over the modes, so that the numerical aperture represents a reasonable (perhaps slightly too high) estimate for the actual beam divergence. This leads to the equation
where a is the fiber core radius (i.e., half the core diameter). If the light is launched mostly in lower-order guided fiber modes, the beam quality can also be substantially better, but may then be degraded by strong bending of the fiber.
The RP Photonics Buyer's Guide contains 77 suppliers for fiber-coupled diode lasers. Among them:
Lumibird manufactures various fiber-coupled laser diodes modules with compact design, high peak power up to 600 W and high coupling efficiency. Fibers are field replaceable.
Sheaumann’s fiber-coupled modules are well-suited for applications where a circular, homogenized beam is desired, such as those utilizing DPSS end-pumping or compact ones requiring simple optics. Using proprietary diode fabrication and fiber preparation/alignment processes to achieve a low-noise output, Sheaumann offers modules with a high beam quality ideal for such applications as spectroscopy and free-space optical communications. These unique technologies also reduce speckle, and when paired with an appropriate connector, modules can be used as high-performance pointing devices. Let Sheaumann custom design your module, from diode to fiber to package, to work optimally in your system and outperform your competition.
RPMC Lasers offers one of the widest wavelength selections of fiber-coupled diode lasers, available in wavelengths from the UV through the IR. These products include multimode single emitters, multi-emitter fiber coupled modules, single-mode laser diodes, laser diode bars, laser diode stacks, superluminescent laser diodes, and are available in many different fiber-coupled packaging, SM/MM/PM fibers, and fiber diameter options.
The fiber-coupled laser diode beam sources of type 51nano-S have reduced power noise (< 0.1% RMS (< 1 MHz)), reduced coherence length (≈ 300 µm) and a low speckle contrast as a result of the internal RF modulation. They are available with wavelengths from 405 nm to 1550 nm.
Frankfurt Laser Company offers fiber-coupled single-mode and multimode laser diodes – also including high-power diodes. Both cooled and uncooled packages are available.
While all of Toptica's diode lasers can be combined with Toptica's versatile fiber launch FiberDock™, we also offer dedicated, permanently fiber-coupled systems.
The iBeam-smart-PT as well as the Multi-Laser Engine iChrome xLE cover the range from 375–785 nm and provide a single-mode polarization maintaining fiber delivery.
Toptica's proprietary COOL technology enables drop-shipment and ensures constant output powers even under strongly varying ambient conditions.
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Fiber-coupled (also called fiber-integrated or fiber-pigtailed) diode lasers have several advantages:
Each fiber-coupled LED consists of a single LED that is coupled to the optical fiber using the butt-coupling technique. During this process, the fiber connector is positioned so that the end of the fiber will be as close as possible to the emitter, thereby minimizing losses at the fiber input and maximizing output power.
www.thorlabs.de/newgrouppage9.cfm?obje…
Which is the first fiber coupled modulator in the world?
Which is the first fiber coupled modulator in the world?
G&H continues to lead the market in the development of fiber-coupled modulators, offering the first devices for visible wavelengths from 397 nm to 780 nm to meet the needs of sensing and quantum technology applications.
gandh.com/product-categories/fiber-couple…
Here, the outputs of individual emitters may be coupled into separate fibers of a fiber bundle . The fibers are arranged in a linear array on the side of the diode bar, but as a circular array on the output end. Alternatively, some kind of beam shaper for symmetrizing the beam quality may be used before launching into a single multimode fiber.
www.rp-photonics.com/fiber_coupled_diode…
Many diode lasers are thus sold in fiber-coupled form, with robust fiber coupling optics (e.g., a permanent laser-welded fiber attachment) built into the laser package. The used fibers and techniques differ very much for different diode lasers:
www.rp-photonics.com/fiber_coupled_diode…
https://www.aerodiode.com/fiber-coupled-laser-diode-basics
Перевести · A “standard” fiber-coupled laser diode is a common partially reflecting semiconductor cavity where the back facet has a high reflective coating and the front facet a partially reflective one. Typical laser diode chip size is ~1*0.5*0.2mm.
https://www.rp-photonics.com/fiber_coupled_diode_lasers.html
Перевести · Fiber-coupled (also called fiber-integrated or fiber-pigtailed) diode lasers have several advantages: The light …
https://www.linguee.com/english-russian/translation/fiber-coupled.html
Many translated example sentences containing "fiber-coupled" – Russian-English dictionary and search engine …
https://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=5206
Перевести · 15.12.2020 · Each fiber-coupled LED consists of a single LED that is coupled to the optical fiber using the butt-coupling technique. During this …
Multi Wavelength Fiber-Coupled LED Design Tool
Customized Fiber Coupled Laser with Guiding Laser Beam
532nm 20W High Power Fiber Coupled Laser
650nm 200mW Fiber Coupled Laser Module
662nm 2W Red Fiber Coupled Laser Beam
https://gandh.com/product-categories/fiber-coupled-modulators
Перевести · Fiber Coupled Modulators (FC-AOM) Fiber-coupled acousto-optic modulators (FCAOM) offer an elegant and robust solution for amplitude …
https://www.coherent.com/lasers/laser/fiber-coupled-single-emitters
Перевести · Fiber-Coupled Single Emitters Coherent is offering fiber-coupled single emitter modules with the highest efficiencies …
www.qphotonics.com/Fiber-Coupled-Single-Mode-Laser-Diodes
Перевести · Строк: 232 · Fiber coupled Fabry Perot (FP) laser diodes Fiber coupled wavelength-stabilized laser diodes with fiber …
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Fiber Coupled