Tm^3+ and Tm^3+-Ho^3+co-doped tungsten tellurite glass single mode fiber laser

Abstract

Abstract:We investigated the ~2 µm spectroscopic and lasing performance of Tm 3+ and Tm 3+-Ho 3+ co-doped tungsten tellurite glass single mode fibers with a commercial 800 nm laser diode. The double cladding single mode (SM) fibers were fabricated by using rod-in-tube method. The propagation loss of the fiber was ~2.5 dB/m at 1310 nm. The spectroscopic properties of the fibers were analyzed. A 494 mW laser operating at ~1.9 µm was achieved in a Tm 3+ doped 20 cm long fiber, the slope efficiency was 26%, and the laser beam quality factor M 2 was 1.09. A 35 mW ~2.1 µm laser output was also demonstrated in a 7 cm long of Tm 3+ -Ho 3+ co-doped tungsten tellurite SM fiber.

Compact broadband amplified spontaneous emission in Tm^3+-doped tungsten tellurite glass double-cladding single-mode fiber

“…The diameter of the fiber was ~250 μm. The single-mode fiber with a small V parameter can provide good beam quality [15]. The core of the fiber was uniformly doped with 1 mol.…”

“…To date, superfluorescent sources near 2 μm have been achieved in silica, silicate, and fluoride fibers with a commercial 0.8 μm laser diode or in-band pumped at 1.6 μm [5,6,10,11], but there is no investigation on 2 μm ASE in tellurite glass fiber. It is widely acknowledged that tellurite glass is a promising ~2 μm fiber laser host material [13][14][15]. In contrast to the common fiber host glasses, multiple component tellurite (TeO 2 ) glass exhibits significant advantages such as a low phonon energy of 780 cm −1 that results in low non-radiative rates, high radiative rates, and wide transmission window (0.4-5 μm); high rareearth solubility enables very compact fiber component to be realized [14,15]; high nonlinearity provides nonlinear optical applications like supercontinuum generation [16].…”

“…It is widely acknowledged that tellurite glass is a promising ~2 μm fiber laser host material [13][14][15]. In contrast to the common fiber host glasses, multiple component tellurite (TeO 2 ) glass exhibits significant advantages such as a low phonon energy of 780 cm −1 that results in low non-radiative rates, high radiative rates, and wide transmission window (0.4-5 μm); high rareearth solubility enables very compact fiber component to be realized [14,15]; high nonlinearity provides nonlinear optical applications like supercontinuum generation [16]. Tellurite glass also has a large refractive index (~2.1) which enhances both the absorption and emission cross sections, and with its broad emission spectra it is good for obtaining efficient signal amplification [17].…”

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

“…(14) and (17), n 2 (t) can be expressed as n 2 ðtÞ n 2 ð0Þ ¼ A 32 n 3 ð0Þ n 2 ð0Þ½A 21 þC ET n Ho À A 31 ÀA 32 exp…”

“…Hence, Yb 3 þ , Tm 3 þ , Nd 3 þ and Er 3 þ with a strong absorption band near 808 nm or 980 nm wavelengths have been utilized as the sensitizer to solve this problem [1,[8][9][10]. So far, Ho 3 þ /Yb 3 þ codoped [8,11,12], Ho 3 þ /Tm 3 þ codoped [13][14][15], and Ho 3 þ /Nd 3 þ codoped [1,16] glasses have been investigated by researchers. However, to our knowledge, Er 3 þ sensitized Ho 3 þ doped glasses are less reported for 2 μm radiations but some investigations on upconversion and energy transfer process [10,17].…”