Continuous-wave pumped frequency upconversions in an InSe-integrated microfiber

Abstract

We report the achievement of continuous-wave (CW)-pumped second-harmonic generation (SHG) and sum frequency generation (SFG) in a layered indium selenide (InSe)-integrated microfiber. As a result of the strong interaction between the InSe nanosheets and the evanescent field, the second-order nonlinear processes are greatly enhanced in the InSe-integrated microfiber pumped by a few milliwatt CW lasers. The experimental results reveal that the intensities of SHG and SFG are quadratic and linear dependencies with the incident pump power, respectively, which is consistent with theoretical predictions. Additionally, the SHG intensity is strongly polarization-dependent on the nonaxisymmetrical distribution of the InSe nanosheets around the microfiber, providing the possibility of the SHG-polarized manipulation. The proposed device has the potential to be integrable into all-fiber systems for nonlinear applications.

Generating higher order bright soliton pulse using Integrated Lithium Niobate Waveguides for higher end supercontinuum application

“…That is, m's are derived from the numerical derivative of β in relation to ω [3]. To calculate β1, its value can be obtained using MATLAB and the numerical derivative of eq (14). Of course, eq (15) can also be used to calculate β1.…”

“…In the presence of nonlinear effects and in combination with optical scattering, the material shows different behaviors. Nonlinear effects in optical waveguides are obtained from second and third-order absorption, which causes various nonlinear phenomena such as second and third-harmonic generation and nonlinear refractive index [12][13][14][15]. The dependence of the refractive index strongly leads to interesting nonlinear effects, the most important of which are self-phase modulation and hetero-phase modulation.…”

Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal

“…To evaluate the nonlinear conversion performance, the detailed comparisons are given based on schemes listed in Table 1. In the scheme with photonic crystal fibers 14,26 , the SH signal is detected to follow a sinc 2 dependence on the Xe gas pressure, with a conversion-efficiency of 5×10 −11 %W −1 mm −1 . By functionalizing the hollow-core fiber with molybdenum-disulfide (MoS 2 ) or GaSe nanosheets 3,30 , the SH signal is enhanced to three orders of magnitude that of monolayered MoS 2 , with a conversion-efficiency of 4×10 −4 %W −1 mm −1 .…”

Research progress of nonlinear optical properties of integrated two-dimensional materials

“…17 (2023) 174202 174202-6 除了单层TMDCs具有优异的二阶非线性光 学特性外, 层状的GaSe材料在二阶非线性领域也 有着广泛的应用. 2020年, Jiang等 [82] 利用滴覆技 术将少层GaSe纳米片与微光纤集成(图6(b)), 借 助GaSe材料超高的二阶非线性实现了集成结构 中SHG的显著增强; 类似地, 2021年该课题组利 用热光沉积 [83] 的方法将具有高二阶非线性系数的 硒化铟 (InSe) 与微光纤集成(图6(c)), 在连续波 激光器泵浦条件下实现了全光纤结构中的高效二 阶非线性过程 [84] .…”