Raman-converted high-energy double-scale pulses at 1270 nm in P₂O₅-doped silica fiber

Abstract

This work presents implementation of a new approach to single-cascade Raman conversion of laser pulses from the spectral range around 1.1 µm into the 1.3-µm wavelength region. The proposed conversion technique relies on double-scale pico-femtosecond pulses for synchronous pumping of an external cavity made of phosphosilicate fiber with highprecision adjustment of pulse repetition rate to the inter-mode frequency of the external cavity. This enabled generation of double-scale pulses centered at 1270 nm featuring a record energy of 63 nJ and the pulse envelope duration of 88-180 ps with the sub-pulse duration of 200 fs. The fraction of the radiation that was converted into the 1270 nm range amounted to 47 percent of the total Raman-converted radiation power. The generated results offer promising possibilities for new spectral ranges to be developed in the field of high-energy pulsed sources with unique double-scale temporal structure.

Cascaded All-Fiber Gas Raman Laser Oscillator in Deuterium-Filled Hollow-Core Photonic Crystal Fibers

“…Since competition causes output power fluctuations, which affects the stability and reliability of the FGRLs, the competition should be suppressed as much as possible in practical applications. On the one hand, referring to various dopants or different materials in the solid-core fiber to change the Raman gain [ 41 , 42 , 43 ], a special gas-mixing system could be designed to control the distribution and concentration of gas components to reduce gain competition. On the other hand, spectral filtering techniques can be used to select the output wavelength.…”

Nd-Doped Polarization Maintaining All-Fiber Laser With Dissipative Soliton Resonance Mode-Locking at 905 nm

“…Equations (1-3) have been simulated by the split-step Fourier method in the simulation window τwin discretized with 2 13 points. Total losses of the laser were about α ≈ 6.4 dB coming from the laser components losses and output coupler.…”

“…LTRAFAST fiber lasers attracted much attention in recent years because of their compactness, low cost, robustness and simplicity of operation, and considered as an ideal light source for two-photon microscopy (TPM), optical coherent tomography, laser spectroscopy, precision metrology, LIDAR, quantum communications and also for generation of blue light through frequency doubling [1]- [4]. However, most of the fiber systems work in the spectral region between 1 and 2 μm [5]- [13]. Wavelength below 1 μm remains domain of the solid-state lasers, with the domination of titanium-sapphire (Ti:Sa) lasers with excellent ultrashort pulse emission tunable in 690-1050 nm wavelength range.…”

Incoherent laser

“…Noise-like pulses are interesting both because of their random (or quasi-random) distribution of the field oscillation phase within the pulse and because of comparatively short duration of the pulse envelope and its components [9,10]. Aside from this, such pulses are able to sustain relatively high average radiation power [11,12] and are amenable to highly efficient nonlinear conversion [13,14]. A combination of attractive properties of noise-like pulses makes them a preferable choice for implementation of a low-coherence laser.…”