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

Abstract

A novel Nd, La:SrF 2 disordered crystal is prepared, and its continuous-wave wavelength tuning operation is performed for the first time. Employing a surface plasmon resonance (SPR) based gold nanobipyramids (G-NBPs) saturable absorber, we obtain a compact diode-pumped passively Q-switched Nd, La:SrF 2 laser. The stable Q-switched pulse operates with the shortest pulse duration of 1.15 µs and the maximum repetition rate of 41 kHz. The corresponding single pulse energy is 2.24 µJ. The results indicate that G-NBPs could be a promising saturable absorber applied to the diode-pumped solid state lasers (DPSSLs).

516 mW, nanosecond Nd:LuAG laser Q-switched by gold nanorods

“…This could be solved by introducing a cooling device to the SA, and the cavity should be optimized. Figure 8 shows the spectrum of the Q-switched laser, and the central wavelength was located at 1064.68 nm, which was a little different from the CW operation [36] . It should be noted that during the whole Q-switched operation, no thermal damage was observed on the surface of the SA.…”

“…The fast recovery time of a few picoseconds also contributes to the performance of GNRs as the SA, which will facilitate the ultrashort pulse generation [25] . To date, several reports have been presented on the GNRs Q-switched and mode-locked lasers at a number of wavelengths from the visible band to 2 μm with the pulse duration from femtoseconds to microseconds [26][27][28][29][30][31][32][33][34][35][36] , illustrating the effective SA performance of GNRs similar to 2D materials in the generation of a pulsed laser. Among these, a few results have been reported on the Nd-doped solid-state lasers.…”

“…The average power was 44 mW at the pump power of 7.2 W for 1061 nm and 100 mW for 1106 nm, generating 101 mW average power and using GNRs as the SA. In 2017, Zhang et al reported their 1061 nm Nd, La:SrF 2 laser Q-switched by gold nanobipyramids [36] . The pulse of 1.15 μs with the repetition rate of 41 kHz was obtained, and the average power was 92 mW.…”

Derivation of lattice Boltzmann equation via analytical characteristic integral

“…hydrodynamic systems [1,2] , multiphase and multicomponent fluids [3][4][5][6][7] , porous media flow [8,9] . With the rapid development of multi-core super computer and parallel computation, LB method is gaining more attention from CFD researchers due to its inherent parallelism [10][11][12] . Historically, LB method arose from the pioneering idea of lattice-gas automata [13] , however more recently we tend to link it with the kinetic equation, Bhatnagar-Gross-Krook (BGK) Boltzmann equation [14] , which leads to the reconstruction of LB theory [15][16][17][18][19][20][21] .…”

Silver nanorods absorber for passively Q-switched Nd,Gd:CaF2 laser

“…[6,7] , topological insulators (Bi 2 Se 3 , Bi 2 Te 3 , etc. ), and black phosphorus (BP) has not yet subsided, metal nanomaterials, one of them, have attracted increasing attention due to their interesting optical properties and application prospects [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . This is because noble metal nanoparticles dispersed in dielectric media exhibit ultrafast nonlinear optical responses around localized surface plasmon resonance (LSPR), resulting in potential applications in SAs [8][9][10] .…”