1018  nm Yb-doped high-power fiber laser pumped by broadband pump sources around 915  nm with output power above 100  W

Abstract

We demonstrate a 1018 nm ytterbium-doped all-fiber laser pumped by tunable pump sources operating in the broad absorption spectrum around 915 nm. In the experiment, two different pump diodes were tested to pump over a wide spectrum ranging from 904 to 924 nm by altering the cooling temperature of the pump diodes. Across this so-called pump wavelength regime having a 20 nm wavelength span, the amplified stimulated emission (ASE) suppression of the resulting laser was generally around 35 dB, showing good suppression ratio. Comparisons to the conventional 976 nm-pumped 1018 nm ytterbium-doped fiber laser were also addressed in this study. Finally, we have tested this system for high power experimentation and obtained 67% maximum optical-to-optical efficiency at an approximately 110 W output power level. To the best of our knowledge, this is the first 1018 nm ytterbium-doped all-fiber laser pumped by tunable pump sources around 915 nm reported in detail.

A Narrow-Linewidth Linearly Polarized 1018-nm Fiber Source for Pumping Diamond Raman Laser

“…For optical fiber lasers, spectral linewidth broadening, induced by fiber nonlinearity and dispersion [17][18][19][20], is the main challenge of generating narrow-linewidth lasers with a high output power. The output spectral linewidth of 1,018 nm emitting with an output power of around 100 W has been still more than 75 GHz [21,22]. Another main challenge is the amplified spontaneous emission (ASE) at around 1,030 nm due to its higher gain in YDF than that at 1,018 nm.…”

407 W specially-designed fiber laser at 1018 nm using a gain fiber with a low core/cladding ratio of 20/400 μm

“…A record of a 805W YDFL at 1018 nm with a slope efficiency of 64.9% was achieved most recently by Yan et al [13]. Other reports can be found in [14][15][16][17][18][19][20][21][22][23][24][25][26]. Almost all the reported high power YDFLs operating at 1018 nm have been achieved by fibers with higher core/cladding area ratios.…”