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25 nJ, 634 ps and 1 MHz all-fiber passively mode-locked fiber laser based on a GaAs saturable absorber
摘要： We demonstrate an all-fiber passively mode-locked Tm-Ho co-doped fiber laser based on a GaAs saturable absorber (SA) fiber laser at 1875.2 nm. With a 10% output coupler, the fiber laser outputs 1.13 MHz, 634 ps and 25 nJ pulses at 1875.2 nm with a 3 dB-bandwidth of 18.4 nm. The Q-switched mode-locking (QML), the mode-locking at fundamental repetition rate (FRR) and the mode-locking at second harmonic of repetition rate (SHRR) are also observed with the increase of the pump power. The main reason of the SHRR is soliton pulse energy quantization effect.
关键词： Low repetition rate,Mode-locked fiber laser,Soliton pulse,Nanosecond pulse,Soliton pulse energy quantization effect
更新于2025-11-28 14:24:03
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Numerical investigation and analysis of flattened dispersion for supercontinuum generation at very low power using Hexagonal shaped Photonic crystal fiber (H-PCF)
摘要： In this work, we report a design of hexagonal photonic crystal fiber (PCF) with eight hexagonal rings with modified air hole size at the innermost ring. We analyze and compare the major optical parameters of a PCF such as dispersion and nonlinearity over the span of wavelength ranges from 800 nm to 1600 nm at different core diameters. The designs exhibit a high nonlinearity of 220 W-1 km-1 at 800 nm for supercontinuum generation in designed PCF and along the dispersion in negative characteristics about ?650 ps/nm.km at 1310 nm with two zero dispersion wavelengths at 864 nm and at 1484 nm are numerically studied. In addition, we investigate the numerical modeling of supercontinuum (SC) generation in the designed PCFs and nearly 600 nm using 50 fs pulse with 2 kW pump power at 800 nm spectrum have been observed.
关键词： Soliton pulse,Supercontinuum generation,Photonic crystal fiber,Nonlinear Schr?dinger equation,Two zero dispersion wavelength
更新于2025-09-10 09:29:36