83 W, 31 MHz, square-shaped, 1 ns-pulsed all-fiber-integrated laser for micromachining

Ozgoren, K.; Öktem, Bülent; Yilmaz, Sinem; Ilday, F. Ö.; Eken, Koray

doi:10.1364/oe.19.017647

Cited by 150 publications

(56 citation statements)

References 18 publications

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“…Both fibers have the same core and clad numerical aperture, which enables very low-loss splicing between them. Apart from the hybrid doping structure, the final amplifier stage is the same as in [15], where further details can be found. We employ two 25 W diodes and three 32 W diodes, all operating at ∼976 nm, for pumping.…”

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confidence: 99%

Doping management for high-power fiber lasers: 100 W, few-picosecond pulse generation from an all-fiber-integrated amplifier

et al. 2012

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Thermal effects, which limit the average power, can be minimized by using low-doped, longer gain fibers, whereas the presence of nonlinear effects requires use of high-doped, shorter fibers to maximize the peak power. We propose the use of varying doping levels along the gain fiber to circumvent these opposing requirements. By analogy to dispersion management and nonlinearity management, we refer to this scheme as doping management. As a practical first implementation, we report on the development of a fiber laser-amplifier system, the last stage of which has a hybrid gain fiber composed of high-doped and low-doped Yb fibers. The amplifier generates 100 W at 100 MHz with pulse energy of 1 μJ. The seed source is a passively mode-locked fiber oscillator operating in the all-normal-dispersion regime. The amplifier comprises three stages, which are all-fiber-integrated, delivering 13 ps pulses at full power. By optionally placing a grating compressor after the first stage amplifier, chirp of the seed pulses can be controlled, which allows an extra degree of freedom in the interplay between dispersion and self-phase modulation. This way, the laser delivers 4.5 ps pulses with ~200 kW peak power directly from fiber, without using external pulse compression.

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confidence: 99%

Doping management for high-power fiber lasers: 100 W, few-picosecond pulse generation from an all-fiber-integrated amplifier

et al. 2012

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“…Good candidates for such a pump source are figure-eight fiber lasers operating in noiselike pulse mode with pulse lengths around 1 ns [21], which could be amplified to the required energies in fiber amplifiers.…”

Section: B Incoherent Pump Pulsementioning

confidence: 99%

Temporal coherence in mirrorless optical parametric oscillators

et al. 2012

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One of the unique features of mirrorless optical parametric oscillators based on counterpropagating three-wave interactions is the narrow spectral width of the wave generated in the backward direction. In this work, we investigate experimentally and numerically the influence that a strong phase modulation in the pump has on the spectral bandwidths of the parametric waves and on the efficiency of the nonlinear interaction. The effects of group-velocity mismatch and group-velocity dispersion are elucidated. In particular, it is shown that the substantial increase in temporal coherence of the backward-generated wave can be obtained even for pumping with a temporally incoherent pump. A configuration of a mirrorless optical parametric oscillator is proposed where this gain in spectral coherence is maximized without a penalty in conversion efficiency by employing group-velocity matching of the pump and the forward-generated parametric wave.

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“…This regime, typical of long lasers (10-100 m) and / or subjected to a strong pumping injection, differs radically from soliton regimes. Their high energy, very large spectral width (up to several hundreds of nm) and low temporal coherence make them attractive for applications such as sensors [8], supercontinuum generation [9], nonlinear frequency conversion, or microprocessing of materials such as titanium [10]. In addition, they arouse a growing interest in the search for optical rogue waves.…”

Section: Introductionmentioning

confidence: 99%