345-mW 1836-nm single-frequency DFB fiber laser MOPA

High Power Tunable Tm3+-fiber Lasers and Its Application in Pumping Cr2+:ZnSe Lasers

“…When the cavity is constructed with an output coupler of 10% transmission, the laser has a threshold pump power of 135 mW and a maximum output power of 1.09 W. When the pump power is over 10 W, rollover of the output power occurred, which probably stemmed from large amount of heat generated in the fiber due to large quantum defect. The slope efficiency of the fiber laser is about 9.6% with respect to launched pump power, which is much higher than that of silica based DFB fiber lasers [7,32], but lower than that from a thulium-doped germinate glass fiber laser [31]. The comparatively low slope efficiency can be accounted by poor pump absorption due to relatively low doping concentration and short fiber length.…”

“…The cross relaxation process, as shown in Fig 6, can produce >100% quantum efficiencies for Tm 3+ -doped fiber lasers [9][10]. In experiment, slope efficiency larger than 60% has been achieved (quantum efficiency>150%) in Tm 3+ -doped fiber lasers [11][12]. In Tm 3+ -doped silica fiber lasers, high-degree Stark splitting of the 3 H 6 level by local electric field produces a broad emission band (>400 nm), as shown in Fig.…”

“…In addition, short fiber lasers are free from the undesired nonlinear effects such as stimulated Raman, Brillouin scattering and so on. Short-length Tm 3+ -doped fiber lasers can be used to achieve single frequency output [7,[30][31], as well as moderate-level laser output [32] in the mid-infrared region. Such kind of compact mid-infrared laser device has great potentials in communication and integrated optical systems.…”

Single-frequency Raman Distributed-feedback Fiber Laser

“…These performance features have been achieved in heavily rare-earth (RE)-doped fibers with unidirectional ring configurations [1], short-cavity distributed Bragg reflector (DBR) designs [2] and distributed-feedback (DFB) structures [3][4][5]. However, the lasing wavelength region of RE-doped lasers is naturally limited by the specific RE ions used.…”

51.5 W monolithic single frequency 1.97 m Tm-doped fiber amplifier

“…In recent years, 2 µm single frequency fiber lasers have undergone rapid development [11][12][13][14][15][16][17][18][19][20][21][22] since fiber lasers have outstanding advantages including high efficiency, considerable compactness, convenience for thermal management, high beam quality and excellent stability. To realize single frequency fiber laser near 2 µm, distributed Bragg reflector (DBR) [15] and distributed-feedback (DFB) [12,19] techniques have been employed, the output power is limited and should be further amplified for practical applications. At present, most of the reported high power single frequency fiber lasers near 2 µm are achieved based on bulk configuration [3,4] .…”