The Research Of 2 μm Fiber Laser

Near infrared 2μm range have an important applications in various aspects such as military,medical,scientific research,communication,and industrial production,has always been a hot spot in the current research research.At the same time,the fiber laser compares to the traditional solid laser,the semiconductor laser has a compact,cheap,high beam quality,so we have made theses research around 2 μm fiber lasers.The main contents of this topic are based on 2μm near-infrared fiber lasers.First introduce these few phenomena in the fiber,such as introducing the basic principles of fiber lasers,and common devices,next to introduce the Q-switch fiber laser and the basic principles of this laser.In particular,two forms,active locking modes and passive locking modes,and saturated absorption effects such as Graphene,TMD,Semiconductor Saturable Absorber Mirror.Finally we describe nonlinear polarization rotational lock modes fiber laser.Next,we introduced a layered semiconductor material Bi2O2 Se was introduced in a 2 μm wave section fiber laser,and a 2 μm Q-switch fiber laser was built for this,a 2 micron regular Qswitch laser correlation experiment,and the experiment successfully realized a stable Bi2O2 Se material.The 2 micron regulating Q-switch laser as a saturable absorber is demonstrated that the layered semiconductor material Bi2O2 Se has a nonlinear absorption effect in the near infrared wave range We have experimentally proved that layer-semiconductor Bi2O2 Se exhibits nonlinear absorption at the near-IR band.And we obtained a stable Q-swiching fiber lasers at 2μm by using this emerging SA device.Our results establish layer-semiconductor Bi2O2 Se as a promising SA device for wideband and tunable mode-locked lasers across the near-and mid-IR wavelength range.Then,we introducing a 2 micron femtosecond tunable laser is introduced,and the broad spectrum can be tuned by using high non-linear fiber to produce hyperlightening spectrum.The the central wavelength of the experiment is based on of 1550 nm,Semiconductor Saturable Absorber Mirrors Sesams as the saturable absorber.The maxmuim outpower is 2 m W,and the spectral width of the fiber laser is 5 nm,the mode-locked fiber laser is used as a seed source.Than amplifiering by an erbium-doped fiber to 120 m W,and compressing the pulse from 10 ps to 50 fs,after that,a super continuous spectrum is generated acrossing an 0.2 m HNLF(high-non-linear fiber),the spectral range from 1.2 μm to 2 μm.and then amplified by Tm fiber,the output power of the amplification is up to 153 m W,pulse width for 177 fs,the center wavelength is tunable from1867 to 1890 nm by adjusting the pump power,and finally,we invented a mid-ir fiber laser as a patented in which the laser is used as a light source.Solving the problem of tuning width in the infrared laser is narrow,successfully,forming a stable medium infrared optical frequency comb,and also has a relatively wide application prospect.