Intro”u“tion Optimization of the Acid Catalyst Concentration for Synthesis of Anti‐Cancer Agent Gamavuton‐0 by Using Mathematical and Statistical Software
3. Fiber Lasers
Ti:saphire laser was first used for frequency comb laser. owever, it is large, weak in stability, and difficult to long operation. Especially, the connection to a large nonlinear photonic crystal fiber has a large connection loss and instability. On the other hand, a fiber laser is robust and compact and maintenance free long time operation is possible. naba, ., et al., . 3.1 Fiber Laser A fiber laser is a laser in which the active gain medium is an optical fiber doped with rare‐earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, thulium and holmium see Fig. . They are related to doped fiber amplifiers, which provide light amplification without lasing. Fiber nonlinearities, such as stimulated Raman scattering or four‐wave mixing can also provide gain and thus serve as gain media for a fiber laser. Pump LD Fiber-type Grating Output Fiber-type Grating Fig. Fundamental scheme of a fiber laser. Fig. Example of a fiber amplification scheme. 3.2 Advantages and applications A fiber laser has superior characteristics as follows: A laser cutting machine with a kW continuous wave fiber laser The advantages of fiber lasers over other types include: Light is already coupled into a flexible fiber: igh output power: igh optical quality: Compact size: igh peak power and nanosecond pulses enable effective marking and engraving. The additional power and better beam quality provide cleaner cut edges and faster cutting advantages and application speeds. Lower cost of ownership. Applications of fiber lasers include material processing marking, engraving, cutting , telecommunications, spectroscopy, medicine, and directed energy weapons. Er‐doped fiber lasers EDFLs can be viewed as EDFAs operating in the particular regime where coherent oscillation of ASE occurs due to some feedback means. A standard definition could be the following: EDFLs are used as sources for coherent light signal generation, while EDFAs are used as wave‐wave amplifiers for coherent light signal regeneration. All EDFLs can be pumped with compact, efficient, and sometimes inexpensive laser diodes. They are compatible with different fibers and fiber optic components used in communications so they have negligible coupling losses. Fiber waveguiding and splicing alleviate any mechanical alignment of parts and provide superior environmental stability. There are many possible laser cavity designs and configurations. The tunable EDFL configuration presented here uses an all‐fiber ring laser cavity. Wavelength selectivity can be achieved by using a tunable transmission filter. This example will show how OptiSystem can simulate laser ring design and ASE sources. The setup parameters are very important to obtain a steady state output power. This means the user must find the minimum number of convergence iterations to obtain correct results. 3.3 Erbium-doped Fiber Laser Fig. Schematic setup of a simple erbium‐doped fiber amplifier. Two laser diodes LDs provide the pump power for the erbium‐doped fiber. The pump light is injected via dichroic fiber couplers. Pig‐tailed optical isolators reduce the sensitivity of the device to back‐reflections. A typical setup of a simple erbium‐doped fiber amplifier EDFA is shown in Fig. . ts core is the erbium‐doped optical fiber, which is typically a single‐mode fiber. n the shown case, the active fiber is pumped” with light from two laser diodes bidirectional pumping , although unidirectional pumping in the forward or backward direction co‐ directional and counter‐directional pumping is also very common. The pump light, which most often has a wavelength around 8 nm and sometimes around nm, excites the erbium ions Er + into the state in the case of 8 ‐nm pumping via , from where they can amplify light in the . ‐μm wavelength region via stimulated emission back to the ground‐state manifold . See also Figure in the article on erbium‐doped gain media. 3.4 ytterbium ‐doped Fiber Laser Ytterbium Yb is a chemical element belonging to the group of rare earth metals. n laser technology, it has acquired a prominent role in the form of the trivalent ion Yb + , which is used as a laser‐active dopant in a variety of host materials, including both crystals and glasses. t is often used for high‐power lasers and for wavelength‐tunable solid‐state lasers. Ytterbium Yb is a chemical element belonging to the group of rare earth metals. n laser technology, it has acquired a prominent role in the form of the trivalent ion Yb + , which is used as a laser‐active dopant in a variety of host materials, including both crystals and glasses. t is often used for high‐power lasers and for wavelength‐tunable solid‐state lasers. 3.5 photonic band‐gap fiber. a b c Fig. Cross‐sections of typical fibers a b double clad fibers, c photonic band‐gap fiber.Parts
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