Chirped-pulse oscillators: a route to high-power femtosecond pulses without external amplification

Fernández, A.; Fuji, Takao; Poppe, Andreas; Fürbach, A.; Krausz, Ferenc; Apolonski, Alexander

doi:10.1364/ol.29.001366

Cited by 141 publications

(65 citation statements)

References 18 publications

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“…1. The inscribing laser was a chirped-pulse oscillator system [20] (Femtosource Scientific XL, Femtolasers), which operates at 792 nm central wavelength and is pumped with a diode-pumped solid state Verdi V-10 (10 W) green, 532 nm laser. The repetition rate of the fs laser is 11 MHz.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

Dubov

Boscolo

Webb

2014

Opt. Mater. Express

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Abstract:We report on the operational parameters that are required to fabricate buried, microstructured waveguides in a z-cut lithium niobate crystal by the method of direct femtosecond laser inscription using a highrepetition-rate, chirped-pulse oscillator system. Refractive index contrasts as high as −0.0127 have been achieved for individual modification tracks. The results pave the way for developing microstructured WGs with low-loss operation across a wide spectral range, extending into the mid-infrared region up to the end of the transparency range of the host material.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…Overall, the optical microfabrication system used enables on-target pulse energies of up to 75 nJ. Without the SBR, the same system produces 26 fs pulses with more than twice the output energy [20,21]. Several microscope objective lenses were used to produce index modifications in the LiNbO 3 crystal.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

Dubov

Boscolo

Webb

2014

Opt. Mater. Express

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“…Wider spectra seem to be problematic due to limitations imposed by saturable Bragg reflector (SBR) mirror in commercial versions. Without the SBR the same system produces 26 fs pulses with more than twice larger output energy [18,19]. Because of the bandwidth and moderate pulse energy both beam delivery and attenuation optics have to be carefully designed to avoid losses and temporal pulse broadening.…”

Section: Laser System and Femtosecond Inscriptionmentioning

confidence: 99%

“…3(a). The observed bands correlate with specific vibrations associated with Nb-O bonds and structural units of phosphate glass matrix [15][16][17][18][19]. The low-wave number peaks at 600 cm −1 and below are assigned to network vibrations [13].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Waveguide fabrication in lithium-niobo-phosphate glasses by high repetition rate femtosecond laser: route to non-equilibrium material’s states

Dubov

Mezentsev

Manshina

et al. 2014

Opt. Mater. Express

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Abstract:We study waveguide fabrication in lithium-niobo-phosphate glass, aiming at a practical method of single-stage fabrication of nonlinear integrated-optics devices. We observed chemical transformations or material redistribution during the course of high repetition rate femtosecond laser inscription. We believe that the laser-induced ultrafast heating and cooling followed by elements diffusion on a microscopic scale opens the way toward the engineering non-equilibrium sates of matter and thus can further enhance Refractive Index (RI) contrasts by virtue of changing glass composition in and around the fs tracks. References and links1. H. Misawa and S. Juodkazis, eds., 3D Laser Microfabrication. Principles and Applications (Wiley-VCH, Weinheim, 2006). 2. R. Osellame, G. Cerullo, and R. Ramponi, Femtosecond Laser Micromachining: Photonic and Microfluidic Devices in Transparent Materials, SpringerLink : Bücher (Springer Berlin Heidelberg, 2012).

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“…Further information regarding all-normal dispersion operation in mode-locked lasers can be found in Refs. [20][21][22][23]. In our setup, after the oscillator, a second, 10 km Ge-doped fiber with a zero dispersion wavelength at 1320 nm is used as a combined amplifier and compressor (Fig.…”

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confidence: 99%

Ultrafast Raman laser mode-locked by nanotubes

et al. 2011

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We demonstrate passive mode-locking of a Raman fiber laser using a nanotube-based saturable absorber coupled to a net normal dispersion cavity. This generates highly chirped 500 ps pulses. These are then compressed down to 2 ps, with 1:4 kW peak power, making it a simple wavelength-versatile source for various applications. In telecommunications, Raman-based amplification allows operation beyond the spectral limits of rare-earth devices [3]. Consequently, similar techniques can be applied to ultrafast fiber lasers. The most attractive feature of Raman-based amplification in silica fiber is that gain is available at any wavelength across the transparency window of the medium (300-2300 nm), given a suitable pump source [3]. With advances in high-power fiber laser pump technology and in cascaded Raman fiber lasers, efficient pump systems are now available throughout this entire band.There have been a number of reports utilizing Raman gain in ultrafast sources [4][5][6][7][8]. However, to date, none of these systems has reached a level of performance comparable with state-of-the-art rare-earth-based lasers. In Ref. [4], dissipative four-wave mixing was used for mode-locking, generating a pulsed laser with a very high repetition rate. While this is useful for some applications, the high repetition rate limits the delivered peak power. Nonlinear loop mirrors [5,6] and nonlinear polarization evolution [8] have also been used to provide saturable absorption, but such systems suffer from instabilities due to fluctuations in ambient temperature, and often exhibit poor self-starting performance [5,6,8].Recently, a Raman mode-locked laser using a semiconductor saturable absorber mirror (SESAM) was reported [7]. While the use of a SESAM improves self-starting and robustness against environmental perturbations, there is limited spectral operation from a single device. In addition, the fabrication cost of SESAMs at nonstandard wavelengths is high. Availability of a broadband saturable absorber (SA) to achieve mode-locking at any desired wavelength across the transmission window of silica is an essential prerequisite to fully exploit the flexibility of Raman amplification in ultrafast sources across the visible and near-IR. Recent interest in the application of nano materials, in particular carbon nanotubes (CNTs) [9][10][11][12] and graphene [10,[13][14][15], as SAs in mode-locked lasers have moved the field a step closer to a fully universal device [9][10][11][12][13][14][15]. For example, a single CNT-based SA was used to mode-lock fiber lasers, offering wide wavelength-tunable pulses [11] and broad spectral coverage from 1 to 2 μm [9].Here, we report a passively mode-locked laser combining both Raman gain and a CNT-based SA in a normally dispersive cavity, showing the potential of this flexible approach. Mode-locked lasers based on rare-earth media and operating with a net normal dispersion map, generating so-called dissipative solitons [12,16,17], were suggested as a means of overcoming the limits on pulse energy imposed b...

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Chirped-pulse oscillators: a route to high-power femtosecond pulses without external amplification

Cited by 141 publications

References 18 publications

Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

Microstructured waveguides in z-cut LiNbO_3 by high-repetition rate direct femtosecond laser inscription

Waveguide fabrication in lithium-niobo-phosphate glasses by high repetition rate femtosecond laser: route to non-equilibrium material’s states

Ultrafast Raman laser mode-locked by nanotubes

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