Frequency doubling of an efficient continuous wave single-mode Yb-doped fiber laser at 978 nm in a periodically-poled MgO:LiNbO3 waveguide

Abstract

A single-mode Yb-doped fiber laser producing 2 W CW at 978 nm is demonstrated with a high slope efficiency of 72%. Thanks to its narrow bandwidth, lower than 0.02 nm, and its tunability of 6 nm, it has been efficiently frequency doubled in a periodically poled MgO:LiNbO3 waveguide, leading to a power of 83 mW at 489 nm and an internal conversion efficiency of 26 %.

Second harmonic generation at 399 nm resonant on the ^1S_0−^1P1 transition of ytterbium using a periodically poled LiNbO_3 waveguide

“…This fabrication is possible by using a high-voltage multi-pulse application method [47]. The reduction or the saturation of the SHG power for a high fundamental power has already been observed using PPLN waveguides for relatively short wavelengths [39,48]. One possible way to reduce this effect is to fabricate a shorter waveguide.…”

978 nm 1.24 ps ultra-short plused large mode area photonic crystal fiber laser

“…980 nm fiber laser has a significant application which is important for generation the blue-green sources through frequency-doubled to 488-490 nm light, and has been also widely reported pumping Er-doped fiber amplifiers/lasers thanks to their excellent beam quality, small volume and simpler thermal management [4][5][6]. To obtain high output power fiber laser in continuous-wave (CW) regime emitting at 980 nm, large mode area photonic crystal fiber (LMA-PCF) is invented, and as a result the output power can scale from milliwatt to hectowatt magnitude.…”

Low‐wavelength emission of Nd‐doped lasers

“…The latter has been addressed for years by neodymiumdoped crystals pumped by laser diodes: for example emission at 946 nm for Nd:YAG or 914 nm for Nd:YVO 4 [4][5][6]. More recently, ytterbium-doped materials (crystals or glass fibres) have been used for the replacement of the argon line at 488 nm (976 nm [7,8] emission followed by frequency doubling [9][10][11][12]). The wavelengths emitted by Nd-doped and Yb-doped materials are fixed by the interaction between the ions and the host.…”