1.12-W Q-switched Yb:KGW laser based on transmission-type Bi ₂ Se ₃ saturable absorber

Abstract

We present a passively Q-switched Yb:KGW laser based on a transmission-type saturable absorber of topological insulator: Bi2Se3. The saturable absorber is prepared on a 0.17-mm glass substrate and can translate intra-cavity for best performance nearly without influence on the laser mode. At a maximum pump power of 13.7 W, the central wavelength, pulse duration, repetition rate, and pulse energy of Q-switched pulse are 1043 nm, 1.5 μs, 175.4 kHz, 6.39 μJ, respectively. The maximum output power is 1.12 W. To our knowledge, this is the highest average output power from passively Q-switched lasers with topological insulator saturable absorbers.

In-band pumped Q-switched fiber laser based on monolayer graphene

“…At present, the output power of passively Q-switched fiber laser employing 2D materials ranges mostly from several milliwatts to a few hundred milliwatts [20][21][22], which is lower than Q-switched laser based on bulk-optics setup [23][24][25].…”

Tunable Nd, La:SrF 2 laser and passively Q-switched operation based on gold nanobipyramids saturable absorber

“…[11] For the other part, nano-materials, especially twodimensional nano-materials, have received considerable attention for their wide-band saturable absorption property applied to the pulse laser generation. [12][13][14][15][16][17][18][19][20][21][22][23][24] As an important component of nano-materials, metal nano-materials have attracted enormous attention, mainly due to the large third order nonlinearity, broadband absorption and fast response time on a time scale of a few picoseconds. [25][26][27][28][29][30][31][32] For example, goldnano material has a large third-order nonlinear coefficient (∼ 10 −6 esu) when compared with the traditional nano-materials (e.g., carbon nanotube (10 −8 esu∼ 10 −9 esu) and graphene (∼ 10 −7 esu)), [33,34] making it easy to obtain self-starting Qswitched or mode-locked operation as an SA.…”

1.5-MHz repetition rate passively Q-switched Nd:YVO 4 laser based on WS 2 saturable absorber

“…[8] The generation of passively Q-switched pulse is due to the energy mutation caused by the nonlinear saturable absorption of intracavity saturable absorber (SA), such as the semiconductor saturable absorber mirror (SESAM) [9,10] or Cr 4+ :YAG. [11][12][13] Considering the expensive cost, complex fabrication, narrow wavelength sensibility from the above SA, carbon nanotubes (CNTs), [14][15][16] graphene, [17][18][19] and some new low-cost two-dimensional (2D) graphene-like materials like topological isolators (TIs), [20][21][22][23][24] transition metal dichalcogenides (TMDs) including WS 2 , molybdenum disulfide (MoS 2 ), etc., [25][26][27][28][29][30][31][32][33] black phosphorus (BP) [34][35][36][37][38] are made into the effective SAs through a simple fabrication process and used for Q-switching technology in SSLs of various wavelength bands. As shown in Table 1, these emerging SAs are (SWCNT, single-walled carbon nanotube; DWCNT, multi-walled carbon nanotude; SAM, saturable absorption mirror; PVA, polyvinyl alcohol; PMMA, polymethyl methacrylate) mostly made by growing nanomaterials through chemical vapor deposition and depositing them on a quartz substrate or a mirror by the spin-coating method.…”