Single-frequency narrow-linewidth Tm-doped fiber laser using silicate glass fiber

Abstract

Single-frequency laser operation near 2 microm has been demonstrated in an all-fiber short-cavity (2-6 cm) distributed feedback laser cavity using both cladding- and core-pump configurations in a newly developed heavily Tm-doped multicomponent silicate glass fiber. Using a single-mode Er-doped fiber laser at 1575 nm as a core-pump source, a 2-cm-long distributed Bragg reflector fiber laser delivers single-frequency output at 1950 nm with laser linewidth less than 3 kHz, which is, to the best of our knowledge, the narrowest linewidth demonstrated to date from any 2 microm single-frequency laser.

Broadband 2μm fluorescence and energy transfer evaluation in Ho3+/Er3+ codoped germanosilicate glass

“…4 that Δλ eff value can reach 172 nm, which is larger than those of tellurite glass (160 nm) [38], fluoride glass (118 nm) [33] and fluorophosphate glass (150 nm) [33]. The higher effective emission bandwidth can be attributed to the existence of various structural unites such as SiO 4 and GeO 4 of germanosilicate glass [39,40]. The different Ge-O and Si-O bond lengths associated with these various structural units lead to multiplicity of ion-ion field strengths.…”

“…In 2009, single-frequency $2 μm laser was demonstrated in Tm-doped silicate glass fiber with laser linewidth less than 3 kHz using a single-mode Er-doped fiber laser at 1575 nm as a core-pump source [4]. In 2013, a direct diode-pumped monolithic thulium doped fiber laser was reported [5].…”

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

“…Single .frequency .lasers near .2 µm, which play a significant role in many applications such as coherent LIDAR, coherent beam combining, nonlinear frequency conversion, medicine, atmospheric sensing and spectroscopy, have attracted intense interest and have been widely investigated [1][2][3][4][5][6][7][8][9][10][11][12] . 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.…”

“…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] .…”

High power widely tunable Tm:fiber laser with spectral linewidth of 10 pm

“…For many applications the need for high output power and good beam quality is also accompanied by the requirement for narrow spectral width and flexibility in operating wavelength. One popular approach to spectrally narrow a fiber laser is to use fiber Bragg gratings (FBGs) [4][5][6][7][8]. However, FBGs have the disadvantage that they are not very effective for spectrum narrowing of large mode area (LMA) fibers that sustain both fundamental and higher transverse mode.…”