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The rising demand in ultrafast radiation sources has boosted the search for high power and high stability mode-locked fiber lasers, particularly at telecom wavelengths. In this work, we demonstrate the first ultrafast mode-locked fiber laser relying on InN as saturable absorber, centered at 1.5μm. The saturable absorber consists of a 1-μm-thick InN grown on a GaN-on-sapphire template deposited by...
Mechanisms of rogue waves (RWs) emergence have been extensively studied in fiber lasers with nonlinearly driven cavities [1], Raman fiber amplifiers and lasers [2], and fiber lasers via modulation of the pump [3]. Previously, it has been found that RWs can be emerged because of soliton-soliton interaction through the overlapping of their tails or soliton-dispersive wave interaction. The result of...
In 1997, Yoshida et al. inserted a Fabry-Perot filter in a modulation instability fiber laser cavity [1], the free spectral range (FSR) of the Fabry-Perot fixed the RF to 115 GHz; however the pulsed laser was poorly stable. Since then, lasers of increasing performance have been demonstrated using variants of this method. In 2012, Peccianti et al. demonstrated the first fiber laser harmonically mode-locked...
Tm-doped fiber lasers, operating in the 2 μm eye-safe region (the absorbable band of human tissues) [1], have potential applications in molecular spectroscopy and medicine [1], where tuning the laser operating wavelength is highly desirable [1]. Tunable multiwavelength mode-locked fiber lasers have been widely reported in the 1 and 1.5 μm regions [2, 3]. Ref. [4] studied the tunability of switchable...
Passively mode-locked femtosecond fiber lasers operating in the telecom band around 1.5 μm are well discovered since many years. Thulium- and Holmium-based hght sources in 2 μm region have greatly gained interest in recent years. Because of the absence of optical transitions in fibers doped with rare-earth ions, the gap between these two spectral regions, namely laser sources at wavelengths around...
Recent rapid progress of high-power picosecond and femtosecond fiber MOPA technology is remarkable. The picosecond MOPA has already crossed the threshold of mJ-level [1]. Usually, these powerful amplification systems contain unbendable rod-type fibers and, therefore, optical schemes are bulky and cumbersome [1]. Nevertheless, the industry requires a simple, all-fiber MOPA system with high peak power...
Passively mode-locked, ultrafast and compact laser sources operating in the wavelength range beyond 2 μm have gained interest for several applications such as nonlinear frequency conversion into the mid-infrared and THz region, material processing, medicine etc. Typically, Ho-doped optical fibers (HDF) are used to directly address this spectral region in ultrafast mode-locked oscillators while Ho:YLF...
Bismuth (Bi)-doped fiber (BDF) lasers and amplifiers have been demonstrated in different glass hosts (i.e., aluminosilicate, phosphosilicate and germanosilicate) covering the 1150–1800nm wavelength region [1-3]. Pulsed Bi-doped fiber lasers (BDFLs) are of great interest owing to their potential applications in medicine, material processing and optical fiber communications. The first Bi-doped pulsed...
Mode-locking (ML) of lasers allows obtaining periodic trains of short optical pulses (ps or shorter) at repetition rates that depend on the cavity length. Mode-locked pulses are employed in a variety of domains such as telecommunications, metrology, remote sensing or material processing. Producing short pulses requires a wide material gain spectrum; thus, lasers that use a Semiconductor Optical Amplifier...
‘Burst’ operating mode of mode-locked fiber lasers, presented for the first time in [1], has recently gained high potential in hard and soft tissue ablation [2, 3]. Pulse bursts consist of temporally closely spaced pulses, which during the ablation prevent rapid cycles of material heating and cooling. Bursts are typically generated at low repetition rate, which allows lower average power at the same...
Frequency combs with large line spacing have many applications and are under intense research. Methods for generating such combs either start with initial frequency spaced lasers (like combined single-frequency lasers, phase- and amplitude modulated lasers or mode-locked-laser) or employ nonlinear effects to start or extend its spectral bandwidth in fibers or micro cavities [1-3]. Here we demonstrate...
Coherent Raman scattering (CRS) [1] is a nonlinear microscopy technique, which can enhance the Raman intensity by orders of magnitude compared to conventional spontaneous Raman measurements, ultimately reaching video-rate imaging speeds [1]. However, it comes at the cost of an increased experimental complexity. In particular, it requires synchronized ultra-fast lasers, where two ps pulses (pump and...
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