1150-nm Yb-Doped Fiber Laser Pumped Directly by Laser-Diode With an Output Power of 52 W

Abstract

A high power, diode pumped, all-fiber Yb-doped fiber laser at 1150-nm wavelength by using conventional double clad fiber with output power of 52.6 W and slope efficiency up to 60% is realized. To the best of our knowledge, it is the highest power at this wavelength.Index Terms-Fiber laser, high power, diode pumped, amplified spontaneous emission, parasitic lasing.

A high-power LD-pumped linearly polarized Yb-doped fiber laser operating at 1152 nm with 42 GHz narrow linewidth and 18 dB PER

“…Besides, high-Q means high intracavity intensity, which may also enhance the nonlinear effects, such as SPM, and thus result in spectral broadening [33]. Consequently, when spectral broadening is serious enough, it will narrow the effective bandwidths of FBGs compared with their nominal bandwidths, and hence lead to an explosive increase of the backward ASE, reduction of the efficiency, roll-off of the output power and the distorted depression of the output spectrum, as observed in [26,27]. Moreover, a relatively shorter fiber length under 976 nm pump regime may help to improve the parasitic lasing threshold to some extent, though it goes against suppressing ASE, as investigated in [25].…”

“…However, to ensure the stability of the oscillator, this is not acceptable because the fiber coating may deteriorate under higher temperatures, which will damage the guidance of the pump light and thus influence the performance of the oscillator. Another flexible way to strengthen the suppression of ASE and improve the output power is to lengthen the gain fiber [28] and construct a high-Q cavity by widening the 3 dB bandwidths of FBGs and increase the reflectivity of OC FBG [26][27][28]. However, lengthening the gain fiber will increase the number of the longitude modes supported in the cavity and correspondingly strengthen the nonlinear effect due to the FWM effect, as reported in [32].…”

“…Another matter worth noting is that for frequency doubling of the long-wavelength Yb-doped fiber laser, unpolarized and wide-linewidth output is generally not preferred in terms of conversion efficiency, as exemplified by the nm-level unpolarized output reported in [26][27][28]. With respect to the case of the polarized emission, high polarization extinction ratio (PER) and narrow linewidth are likewise demanded and pursued all along.…”

Realization and simulation of high-power holmium doped fiber lasers for long-range transmission

“…However, the timescale of the fluorescence decay (on the order of 1 ms) requires a detection system with a faster rise time than the OSA, hence a smaller detection area, and a lower signal intensity. The power delivered by the 1150 nm laser diode appeared too low compared to the detection noise of our photodiode, so we built a Yb-doped fiber laser, based on the design described in [31]. With the pump diodes that were available, we managed to generate a power of about 1 W at 1150 nm, sufficient to pump a 10 cm sample of fiber #1.…”

Realization and simulation of high power holmium doped fiber laser for long-range transmission

“…However, the timescale of the fluorescence decay (on the order of 1 ms) requires a detection system with a faster rise time than the OSA, hence a smaller detection area, and a lower signal intensity. The power delivered by the 1150 nm laser diode appeared too low compared to the detection noise of our photodiode, so we realized a Yb-doped fiber laser, based on the design described in [30]. We then managed to pump a 10 cm sample of fiber #1 with a power up to 1 W. In order to alternate population inversion and observation of fluorescence decay, we apply a 100 Hz square modulation on the pump power by adding a free-space acousto-optical modulator (AOM) on the path of the 1150 nm beam.…”