High-efficiency Bragg gratings in photothermorefractive glass

Efimov, Oleg M.; Glebov, Leonid; Glebova, Larissa; Richardson, Kathleen; Smirnov, Vadim

doi:10.1364/ao.38.000619

Cited by 250 publications

(122 citation statements)

References 6 publications

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“…Volume Bragg gratings, including CBG in photothermorefractive (PTR) glass [4], are widely used in different lasers thanks to their high diffraction efficiency, high damage threshold, and temperature and optical stability (see, e.g., [5][6][7] and references therein). The refractive index modulation period linearly changes along the direction of light propagation.…”

Section: D Chirped Bragg Gratingmentioning

confidence: 99%

Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

et al. 2016

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A method for shaping photocathode laser driver pulses into 3D ellipsoidal form has been proposed and implemented. The key idea of the method is to use a chirped Bragg grating recorded within the ellipsoid volume and absent outside it. If a beam with constant (within the grating reflection band) spectral density and uniform (within the grating aperture) cross-section is incident on such a grating, the reflected beam will be a 3D ellipsoid in space and time. 3D ellipsoidal beams were obtained in experiment for the first time. It is expected that such laser beams will allow reducing the electron bunch emittance when applied at R ± photo injectors.

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Section: D Chirped Bragg Gratingmentioning

confidence: 99%

Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

et al. 2016

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“…Such diodes are nowadays commercially available at 808, 880, 915, 940, and 980 nm. The emission bandwidth of the high-power diodes has to match the absorption bandwidth of the material, which might require a stringent selection of the individual diode bars (typically λ diode < 3-5 nm) or additional wavelength stabilization, e.g., with a volume Bragg grating (VBG) (typically λ diode < 0.5 nm) [43,44]. For optimized thermal management in the laser crystal the gain material should exhibit a small quantum defect, i.e., a laser wavelength close to the pump wavelength.…”

Section: Disk Requirementsmentioning

confidence: 99%

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

et al. 2009

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Ultrafast thin disk laser oscillators achieve the highest average output powers and pulse energies of any mode-locked laser oscillator technology. The thin disk concept avoids thermal problems occurring in conventional high-power rod or slab lasers and enables high-power TEM 00 operation with broadband gain materials. Stable and self-starting passive pulse formation is achieved with semiconductor saturable absorber mirrors (SESAMs). The key components of ultrafast thin disk lasers, such as gain material, SESAM, and dispersive cavity mirrors, are all used in reflection. This is an advantage for the generation of ultrashort pulses with excellent temporal, spectral, and spatial properties because the pulses are not affected by large nonlinearities in the oscillator. Output powers close to 100 W and pulse energies above 10 µJ are directly obtained without any additional amplification, which makes these lasers interesting for a growing number of industrial and scientific applications such as material processing or driving experiments in high-field science. Ultrafast thin disk lasers are based on a power-scalable concept, and substantially higher power levels appear feasible. However, both the highest power levels and pulse energies are currently only achieved with Yb:YAG as the gain material, which limits the gain bandwidth and therefore the achievable pulse duration to 700 to 800 fs in It is important to evaluate their suitability for power scaling in the thin disk laser geometry. In this paper, we review the development of ultrafast thin disk lasers with shorter pulse durations. We discuss the requirements on the gain materials and compare different Yb-doped host materials. The recently developed sesquioxide materials are particularly promising as they enabled the highest optical-tooptical efficiency (43%) and shortest pulse duration (227 fs) ever achieved with a mode-locked thin disk laser.

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“…The dichromated gelatin holographic gratings [11] are probably the best-known type of holographic optical elements applied in ultrashort laser. Other elements such as photothermal refractive gratings [12] and fiber Bragg gratings [13] have also been proposed. Mirror backed volume phase gratings with coated sol-gel or dichromated gelatin films are applied for telecommunication and pulse compression [14][15][16], whereas surface relief reflection gratings [17,18] are readily available from commercial sources.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Hernández‐Garay¹,

Martínez-Matos²,

Izquierdo³

et al. 2011

Opt. Express

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Abstract:The majority of the applications of ultrashort laser pulses require a control of its spectral bandwidth. In this paper we show the capability of volume phase holographic gratings recorded in photopolymerizable glasses for spectral pulse reshaping of ultrashort laser pulses originated in an Amplified Ti: Sapphire laser system and its second harmonic. Gratings with high laser induce damage threshold (LIDT) allowing wide spectral bandwidth operability satisfy these demands. We have performed LIDT testing in the photopolymerizable glass showing that the sample remains unaltered after more than 10 million pulses with 0,75 TW/cm 2 at 1 KHz repetition rate. Furthermore, it has been developed a theoretical model, as an extension of the Kogelnik's theory, providing key gratings design for bandwidth operability. The main features of the diffracted beams are in agreement with the model, showing that non-linear effects are negligible in this material up to the fluence threshold for laser induced damage. The high versatility of the grating design along with the excellent LIDT indicates that this material is a promising candidate for ultrashort laser pulses manipulations.

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High-efficiency Bragg gratings in photothermorefractive glass

Cited by 250 publications

References 6 publications

Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

Generation of 3D ellipsoidal laser beams by means of a profiled volume chirped Bragg grating

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

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