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While initial diode laser research was conducted on simple P-N diodes, all modern lasers use the double-hetero-structure implementation, where the carriers and the photons are confined in order to maximize their chances for recombination and light generation.
Unlike a regular diode, the goal for a laser diode is to recombine all carriers in the I region, and produce light.
Thus, laser diodes are fabricated using direct band-gap semiconductors. The laser diode epitaxial structure is grown using one of the crystal growth techniques, usually starting from an N doped substrate, and growing the I doped active layer, followed by the P doped cladding , and a contact layer.
The active layer most often consists of quantum wells , which provide lower threshold current and higher efficiency.
Laser diodes form a subset of the larger classification of semiconductor p - n junction diodes. Forward electrical bias across the laser diode causes the two species of charge carrier — holes and electrons — to be "injected" from opposite sides of the p - n junction into the depletion region.
Holes are injected from the p -doped, and electrons from the n -doped, semiconductor. A depletion region , devoid of any charge carriers, forms as a result of the difference in electrical potential between n - and p -type semiconductors wherever they are in physical contact.
Due to the use of charge injection in powering most diode lasers, this class of lasers is sometimes termed "injection lasers," or "injection laser diode" ILD.
As diode lasers are semiconductor devices, they may also be classified as semiconductor lasers. Either designation distinguishes diode lasers from solid-state lasers.
Another method of powering some diode lasers is the use of optical pumping. Optically pumped semiconductor lasers OPSL use a III-V semiconductor chip as the gain medium, and another laser often another diode laser as the pump source.
OPSL offer several advantages over ILDs, particularly in wavelength selection and lack of interference from internal electrode structures.
When an electron and a hole are present in the same region, they may recombine or "annihilate" producing a spontaneous emission — i. In a conventional semiconductor junction diode, the energy released from the recombination of electrons and holes is carried away as phonons , i.
Spontaneous emission below the lasing threshold produces similar properties to an LED. Spontaneous emission is necessary to initiate laser oscillation, but it is one among several sources of inefficiency once the laser is oscillating.
The difference between the photon-emitting semiconductor laser and a conventional phonon-emitting non-light-emitting semiconductor junction diode lies in the type of semiconductor used, one whose physical and atomic structure confers the possibility for photon emission.
These photon-emitting semiconductors are the so-called "direct bandgap" semiconductors. The properties of silicon and germanium, which are single-element semiconductors, have bandgaps that do not align in the way needed to allow photon emission and are not considered "direct.
The transition between the materials in the alternating pattern creates the critical " direct bandgap " property. Gallium arsenide , indium phosphide , gallium antimonide , and gallium nitride are all examples of compound semiconductor materials that can be used to create junction diodes that emit light.
In the absence of stimulated emission e. A nearby photon with energy equal to the recombination energy can cause recombination by stimulated emission.
This generates another photon of the same frequency, polarization , and phase , travelling in the same direction as the first photon.
This means that stimulated emission will cause gain in an optical wave of the correct wavelength in the injection region, and the gain increases as the number of electrons and holes injected across the junction increases.
The spontaneous and stimulated emission processes are vastly more efficient in direct bandgap semiconductors than in indirect bandgap semiconductors; therefore silicon is not a common material for laser diodes.
As in other lasers, the gain region is surrounded with an optical cavity to form a laser. In the simplest form of laser diode, an optical waveguide is made on that crystal's surface, such that the light is confined to a relatively narrow line.
Photons emitted into a mode of the waveguide will travel along the waveguide and be reflected several times from each end face before they exit.
As a light wave passes through the cavity, it is amplified by stimulated emission , but light is also lost due to absorption and by incomplete reflection from the end facets.
Finally, if there is more amplification than loss, the diode begins to " lase ". Some important properties of laser diodes are determined by the geometry of the optical cavity.
Generally, the light is contained within a very thin layer, and the structure supports only a single optical mode in the direction perpendicular to the layers.
In the transverse direction, if the waveguide is wide compared to the wavelength of light, then the waveguide can support multiple transverse optical modes , and the laser is known as "multi-mode".
These transversely multi-mode lasers are adequate in cases where one needs a very large amount of power, but not a small diffraction-limited beam; for example in printing, activating chemicals, or pumping other types of lasers.
In applications where a small focused beam is needed, the waveguide must be made narrow, on the order of the optical wavelength.
This way, only a single transverse mode is supported and one ends up with a diffraction-limited beam. Such single spatial mode devices are used for optical storage, laser pointers, and fiber optics.
Note that these lasers may still support multiple longitudinal modes, and thus can lase at multiple wavelengths simultaneously.
The wavelength emitted is a function of the band-gap of the semiconductor material and the modes of the optical cavity. In general, the maximum gain will occur for photons with energy slightly above the band-gap energy, and the modes nearest the peak of the gain curve will lase most strongly.
The width of the gain curve will determine the number of additional "side modes" that may also lase, depending on the operating conditions.
Single spatial mode lasers that can support multiple longitudinal modes are called Fabry Perot FP lasers. An FP laser will lase at multiple cavity modes within the gain bandwidth of the lasing medium.
The number of lasing modes in an FP laser is usually unstable, and can fluctuate due to changes in current or temperature. Single spatial mode diode lasers can be designed so as to operate on a single longitudinal mode.
These single frequency diode lasers exhibit a high degree of stability, and are used in spectroscopy and metrology, and as frequency references.
Due to diffraction , the beam diverges expands rapidly after leaving the chip, typically at 30 degrees vertically by 10 degrees laterally.
A lens must be used in order to form a collimated beam like that produced by a laser pointer. If a circular beam is required, cylindrical lenses and other optics are used.
For single spatial mode lasers, using symmetrical lenses, the collimated beam ends up being elliptical in shape, due to the difference in the vertical and lateral divergences.
This is easily observable with a red laser pointer. The simple diode described above has been heavily modified in recent years to accommodate modern technology, resulting in a variety of types of laser diodes, as described below.
The simple laser diode structure, described above, is extremely inefficient. Such devices require so much power that they can only achieve pulsed operation without damage.
Although historically important and easy to explain, such devices are not practical. In these devices, a layer of low bandgap material is sandwiched between two high bandgap layers.
One commonly-used pair of materials is gallium arsenide GaAs with aluminium gallium arsenide Al x Ga 1-x As. Each of the junctions between different bandgap materials is called a heterostructure , hence the name "double heterostructure laser" or DH laser.
The kind of laser diode described in the first part of the article may be referred to as a homojunction laser, for contrast with these more popular devices.
The advantage of a DH laser is that the region where free electrons and holes exist simultaneously—the active region —is confined to the thin middle layer.
This means that many more of the electron-hole pairs can contribute to amplification—not so many are left out in the poorly amplifying periphery.
In addition, light is reflected from the heterojunction; hence, the light is confined to the region where the amplification takes place.
If the middle layer is made thin enough, it acts as a quantum well. This means that the vertical variation of the electron's wavefunction , and thus a component of its energy, is quantized.
The efficiency of a quantum well laser is greater than that of a bulk laser because the density of states function of electrons in the quantum well system has an abrupt edge that concentrates electrons in energy states that contribute to laser action.
Lasers containing more than one quantum well layer are known as multiple quantum well lasers. Multiple quantum wells improve the overlap of the gain region with the optical waveguide mode.
Further improvements in the laser efficiency have also been demonstrated by reducing the quantum well layer to a quantum wire or to a "sea" of quantum dots.
In a quantum cascade laser , the difference between quantum well energy levels is used for the laser transition instead of the bandgap.
This enables laser action at relatively long wavelengths , which can be tuned simply by altering the thickness of the layer. They are heterojunction lasers.
A Interband cascade laser ICL is a type of laser diode that can produce coherent radiation over a large part of the mid-infrared region of the electromagnetic spectrum.
The problem with the simple quantum well diode described above is that the thin layer is simply too small to effectively confine the light.
To compensate, another two layers are added on, outside the first three. These layers have a lower refractive index than the centre layers, and hence confine the light effectively.
Such a design is called a separate confinement heterostructure SCH laser diode. Almost all commercial laser diodes since the s have been SCH quantum well diodes.
A distributed Bragg reflector laser DBR is a type of single frequency laser diode. One of the mirrors is a broadband reflector and the other mirror is wavelength selective so that gain is favored on a single longitudinal mode, resulting in lasing at a single resonant frequency.
The broadband mirror is usually coated with a low reflectivity coating to allow emission. The wavelength selective mirror is a periodically structured diffraction grating with high reflectivity.
The diffraction grating is within a non-pumped, or passive region of the cavity. A DBR laser is a monolithic single chip device with the grating etched into the semiconductor.
Alternative hybrid architectures that share the same topology include extended cavity diode lasers and volume Bragg grating lasers, but these are not properly called DBR lasers.
A distributed feedback laser DFB is a type of single frequency laser diode. To stabilize the lasing wavelength, a diffraction grating is etched close to the p-n junction of the diode.
This grating acts like an optical filter, causing a single wavelength to be fed back to the gain region and lase. Since the grating provides the feedback that is required for lasing, reflection from the facets is not required.
Thus, at least one facet of a DFB is anti-reflection coated. The DFB laser has a stable wavelength that is set during manufacturing by the pitch of the grating, and can only be tuned slightly with temperature.
DFB lasers are widely used in optical communication applications where a precise and stable wavelength is critical. The threshold current of this DFB laser, based on its static characteristic, is around 11 mA.
The appropriate bias current in a linear regime could be taken in the middle of the static characteristic 50 mA. Vertical-cavity surface-emitting lasers VCSELs have the optical cavity axis along the direction of current flow rather than perpendicular to the current flow as in conventional laser diodes.
The active region length is very short compared with the lateral dimensions so that the radiation emerges from the surface of the cavity rather than from its edge as shown in the figure.
The reflectors at the ends of the cavity are dielectric mirrors made from alternating high and low refractive index quarter-wave thick multilayer.
But there is a disadvantage: There are several advantages to producing VCSELs when compared with the production process of edge-emitting lasers.
Edge-emitters cannot be tested until the end of the production process. If the edge-emitter does not work, whether due to bad contacts or poor material growth quality, the production time and the processing materials have been wasted.
Additionally, because VCSELs emit the beam perpendicular to the active region of the laser as opposed to parallel as with an edge emitter, tens of thousands of VCSELs can be processed simultaneously on a three-inch gallium arsenide wafer.
Furthermore, even though the VCSEL production process is more labor- and material-intensive, the yield can be controlled to a more predictable outcome.
However, they normally show a lower power output level. In VCSELs, the mirrors are typically grown epitaxially as part of the diode structure, or grown separately and bonded directly to the semiconductor containing the active region.
VECSELs are distinguished by a construction in which one of the two mirrors is external to the diode structure. As a result, the cavity includes a free-space region.
The significance of the short propagation distance is that it causes the effect of "antiguiding" nonlinearities in the diode laser gain region to be minimized.
The result is a large-cross-section single-mode optical beam which is not attainable from in-plane "edge-emitting" diode lasers. Several workers demonstrated optically pumped VECSELs, and they continue to be developed for many applications including high power sources for use in industrial machining cutting, punching, etc.
However, because of their lack of p-n junction, optically-pumped VECSELs are not considered "diode lasers", and are classified as semiconductor lasers.
External-cavity diode lasers are tunable lasers which use mainly double heterostructures diodes of the Al x Ga 1-x As type.
Arminia struggled to avoid relegation and managed to stay in the Bundesliga for five years, including two finishes in eighth place in —83 and —84 seasons.
In —85 , Arminia finished third from the bottom and lost the relegation play-offs against 1. The team failed to gain promotion and in the fall of , Arminia had debts of 4.
The result was a last place finish in — Ernst Middendorp became the new manager and assembled a young team for the new season.
Arminia led the way in the Oberliga Westfalen but finished only second in — Four dismal years followed in which the team started well but were unable to compete for the championship.
In the spring of , Arminia created a relatively large media buzz by signing veteran Bundesliga players like Thomas von Heesen , Armin Eck and Fritz Walter.
Arminia signed Stefan Kuntz for the —97 Bundesliga season , their first in 11 years and finished on 14th position. They bounced back by winning the —99 season.
Bruno Labbadia became the league's top scorer with 28 goals. The club suffered from financial problems and entered the — season with a smaller budget.
Relegation followed again after the team became the third team in Bundesliga history to lose ten matches in a row. Arminia struggled against relegation again the next season and avoided to drop into the Regionalliga in close season.
Their fortunes turned around and Arminia won their sixth promotion to the Bundesliga in —02 with Artur Wichniarek scoring 18 goals. Arminia were almost saved the next year but a slump with only two points out of the last six matches sealed relegation again.
The team bounced back again in —04 and were able to stay in the top flight until In —05, Patrick Owomoyela became Arminia's new record national player.
In both seasons, Arminia also kept away from the relegation zone virtually the whole time except the season's beginnings. In , many Arminia fans were sad to see the old East Stand being torn down then the last non-seater stand in the Bundesliga not being placed behind one of the goals  and also further marketing attempts alienated the fans from the Club's Management Board.
From onwards, managerial sackings became more and more common and avoiding relegation became more and more difficult.
Arminia played their fifth consecutive Bundesliga season in — They finished last and were relegated to the 2.
However, after finishing seventh in the —10 season, their next season was fraught with managerial sackings and financial difficulties.
After a poor season, picking up only 16 points and winning only four games, Bielefeld were relegated to the 3. After a poor start, they ended the —12 season in 13th place.
Bundesliga, but lost in the second round in a close match against Bayer 04 Leverkusen , a Europa League participant.
On 11 May , Bielefeld beat VfL Osnabrück 1—0 to guarantee a top two finish and promotion back to the 2. Bundesliga for the —14 season.
That season began quite hopeful: Arminia qualified for the second round of the DFB-Pokal again and at the 8th matchday they had even climbed up to the 3rd rank in the league table.
But after a disastrous autumn and a mediocre winter Arminia fell down onto the 17th rank and the popular coach Stefan Krämer had to leave. His successor Norbert Meier at first had only little more success: Arminia finished 16th in the 2.
Bundesliga, and lost a playoff against SV Darmstadt 98 on away goals after a nd minute extra time goal gave Darmstadt the victory. Arminia had to go back into the 3.
But the next season could wipe out the bitterness of that disaster: In the —15 DFB-Pokal , as a 3. They also were the top team in the 3. Liga after a bad beginning with only four points from the first four matches for the most parts of the season.
Even the qualification for the 2. Bundesliga seemed to become doubtful, but was secured after a 2—2 draw against SSV Jahn Regensburg , the last team in the league table, at the 37th matchday.
Liberated from the pressure of a possible non-qualification, they also won the 3. Liga with a final 1—0 victory at the last matchday.
A stable season with a defeat in the first round of the DFB-Pokal , a lot of draws in the league especially in the beginning: The brightest spots probably were the draws against all three top teams away.
In the league table Arminia never went deeper than rank 14 and finished 12th. A difficult —17 season with two manager sackings followed.
Arminia found themselves among the lowest four teams in the league table from the fourth matchday onwards, mostly on the 16th or 17th rank.
They avoided relegation as they finished in 15th after a 6—0 win over promotion candidate Eintracht Braunschweig and a 1—1 against Dynamo Dresden at the last two matchdays.
The —18 season turned out easier. Having gathered 10 points out of the first four matches, Arminia hardly ever left the upper half of the league table only at the 19th matchday: For example, Arminias 6th rank on the 28th matchday only meant 5 points distance to rank In the end, the 4th rank meant 8 points distance to both the 3rd and the 16th rank.
In that season, Arminia also made a big step in lowering its debts through an alliance of sponsors. Arminia took the club colours blue, white and black upon their foundation in Despite this, Arminia played their first match in an orange kit.
The team that won promotion to the Bundesliga in wore a blue shirt with thick white stripes. The current home kit is blue with a white hoop, black shorts and white socks.
The away kit was mostly all white while green shirts were worn in the s. Currently the away kit consists of a white shirt, white shorts and black socks.
Their third kit is entirely maroon and is used if their other kits clash with the kit of the other teams. The white part of the flag includes the letter A for Arminia.
The flag is surrounded by a wreath of oak. Arminia played their first home matches at the Kesselbrink in downtown Bielefeld. In , Arminia leased a ground from a farmer named Lohmann.
The club member Heinrich Pahl said that the area looks like an Alm German for alpine grassland. The stadium was known as the Alm. Arminia played its first match against Victoria Hamburg on 1 May The first grandstands were constructed in When Arminia won promotion to the Bundesliga in , the Alm underwent a general development.
A main stand with seats was built and the northern and eastern stands were enlarged. The Alm had a capacity of 30, and floodlights were installed.
In , a roof was added to the main stands and the other stands were enlarged again. The stadium had a capacity of 35, then.
The eastern stand was also made smaller and a roof was added. The capacity was reduced to about 15, After Arminia won promotion to the Bundesliga in , the main and northern stands were demolished and completely rebuilt.
The same happened to the south stand in In , Arminia signed a sponsorship deal with Schüco and the stadium was named SchücoArena.
The latest redevelopment saw the Eastern Stand being rebuilt in The Bielefelder Alm has a capacity of 27,, including 20, seats.
Arminia have a large number of loyal supporters. Even in —12, Arminia had an average attendance of 8, which was the highest in the 3.
In —15, Arminia had an average attendance of 14, which was the second! The numbers also show the risen popularity of the 3.
Arminias matches during the —14 2. Bundesliga were attended by 16, in the average,  eighth highest average attendance in the league. These numbers only count league matches.
Arminia's matches in the —15 DFB-Pokal were attended by 21, in the average. The core of the fans can be found on the terraces of the Southern Stand.
Arminia's fans come primarily from the Ostwestfalen-Lippe region with a catchment area of about kilometers around Bielefeld.
There are around fanclubs, mostly from Ostwestfalen-Lippe. The match against them in March which was the first one taking place in Bielefeld after nearly 20 years was attended by 21, spectators.
No other match in the 3. Liga had such a high attendance. One year later the stadium was nearly sold out in that derby.
The earlier rival was VfB 03 Bielefeld from the east of Bielefeld, but the rivalry deceased with the meaning of VfB Bielefeld and nowadays friendly matches between Arminia and VfB Fichte Bielefeld , as the club nowadays is called, take place every year.
Another rival is VfL Bochum , especially since the late 90s, and there were some sort of "fashion rivalries" with other clubs from the Ruhr , because that area also belongs to Westphalia.
Some SC Paderborn 07 supporters seem to consider Arminia as their main rival, but Arminia fans are unlikely to feel the same about them.