Nonlinear Optical Response of Gold Nanobipyramids for a Doubly Q-Switched Ho-Doped Laser at a Wavelength of 2.1 µm

Abstract

Gold nanobipyramids (Au-NBPs) were successfully fabricated using the seed-mediated growth method. The saturable absorption performance of the Au-NBPs at a 2-μm band wavelength was characterized. Using excellent-quality, mature Ho:YLF crystals, a doubly Q-switched (DQS) laser joining an acousto-optic modulator (AOM) with a Au-NBP saturable absorber (SA) was achieved. When the modulation rate of the AOM was 1 kHz, the shortest pulse width (54 ns) was attained, corresponding to the highest peak power (3.87 kW). This was compared with a singly Q-switched laser joining an AOM with an Au-NBP SA, whereby the maximum pulse width compression ratio was 15.2 and the highest peak power enhancement factor was 541.3. Our study has shown that Au-NBPs are a potential saturable absorption nanomaterial, and the DQS laser has the benefit of compressing the pulse width and increasing the peak power at a wavelength of 2.1 μm.

Design of an On-Chip Plasmonic Modulator Based on Hybrid Orthogonal Junctions Using Vanadium Dioxide

“…In the fabrication of the device, there is a need to understand the impact of the width of the plasmonic slot (w) on the device performance, as well as the angle separating the electrodes from the waveguides (θ) given these constitute the critical dimensions of the device and are most susceptible to slight variations given the limitations of the current nanofabrication technology [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. We thus study the impact of increasing the width of the plasmonic slot (w) on the attenuation in both phases and the modulation depth.…”

Multifunctional Plasmon-Tunable Au Nanostars and Their Applications in Highly Efficient Photothermal Inactivation and Ultra-Sensitive SERS Detection

“…As shown in Scheme 1 , the preparation of Au NSs could be divided into two steps, and the detailed preparation process could refer to previous research with minor modifications [ 45 , 46 ]. The first step was to prepare Au seeds using the citrate reduction method.…”

“…Although electron beam lithography can precisely control the size and shape of particles, it is difficult to achieve practical applications due to its high cost and complex process [ 40 , 41 , 42 , 43 ]. At present, the seed-mediated growth method has been favored by researchers because of its high controllability, easy operation, low cost, and good reproducibility [ 38 , 44 , 45 ].…”

High-Stability Hybrid Organic-Inorganic Perovskite (CH3NH3PbBr3) in SiO2 Mesopores: Nonlinear Optics and Applications for Q-Switching Laser Operation

“…is critical for the development of 2D-material-based photonic and optoelectronic devices [ 12 , 13 , 14 , 15 , 16 , 17 ]. Nonlinear saturable absorption is essential for generation of ultrafast laser pulses, which has been widely applied in bulk, fiber, and waveguide laser systems [ 18 , 19 , 20 , 21 , 22 , 23 ]. Recently, the prominent third-order optical nonlinearities and saturable absorption performance of CH 3 NH 3 PbBr 3 have been reported [ 24 , 25 , 26 , 27 , 28 ].…”