Efficient Femtosecond Mid-infrared Pulse Generation by Dispersive Wave Radiation in Bulk Lithium Niobate Crystal (original) (raw)
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Optics Communications, 1998
We describe an all-solid-state collinearly-pumped femtosecond optical parametric oscillator based on periodically-poled Ž. Ž. lithium niobate and tunable in the infrared from 996 nm to 1.22 mm signal and 2.6 to 4.98 mm idler. Maximum output powers of 240 mW for the signal and 106 mW for the idler are recorded with 25 mW of average power measured at 4.88 mm. An overall conversion efficiency of 35% and slope efficiencies for the signal of 40% at a wavelength of 1.04 mm and 70% at 1.1 mm are measured. Using dispersion compensation, interferometric autocorrelations at signal and idler wavelengths of 1.0 and 4.88 mm, implying pulse durations of 210 and 190 fs, respectively, have been obtained. q 1998 Elsevier Science B.V.
Applied Physics Letters, 2003
We experimentally demonstrate the second harmonic generation (SHG) of infrared femtosecond pulses using a BIBO crystal placed in an external ring cavity, synchronized with an input mode-locked laser at 78 MHz. A frequency doubling efficiency of 53% is achieved which is, to the best of our knowledge, the highest value ever reported for a low energy input beam of 1.4 nJ/pulse. Theoretical analysis of cavity related issues such as design, fundamental mode characteristics and fidelity against misalignments are also presented. The modeling of SHG cavity enables us to estimate the cavity losses and the mode matching visibility. Such synchronized SHG cavities in pulse domain, having higher SHG conversion efficiencies compared to their continuous wave counterparts, may find potential applications in scientific areas such as in photonics, and in quantum optics.
Ferroelectrics, 2006
In this work we present the spatial control of the linear susceptibility (χ 1) in Lithium Niobate crystals by means of infrared (800 nm) femtosecond interaction. Diffraction gratings have been performed on the surface (relief) and inside (phase) of these samples by femtosecond laser writing. Also we have performed a spatial control of the quadratic susceptibility (χ 2) by direct writing of a pattern of ferroelectric domains on the surface of z cut substrates by using the second harmonic femtosecond pulses (400 nm). Finally, efficient photonic devices for second harmonic generation via quasi phase matching could be obtained following the experimental procedure presented in this work.
Laser induced soliton waveguides in lithium niobate crystals for guiding femtosecond light pulses
We show that efficient waveguides can be written by bright spatial solitons in lithium niobate photorefractive crystals by c.w. and pulsed laser beams. Using high repetition rate femtosecond laser pulses, an efficient formation of soliton waveguides is possible, after accumulating a large number of pulses, because the photo-excited carrier relaxation time is much longer than the pulse period. These results open the possibility of optimum waveguiding the femtosecond pulsed laser beams, the soliton waveguides creating a graded refractive index profile matched to the spatial beam profile. Our experiments show also very low pulse dispersion in these waveguides.
Journal of the Optical Society of America B, 2013
We describe a near-IR two-stage noncollinear optical parametric amplifier (NOPA) pumped at 800 nm that employs bulk congruent lithium niobate [LiNbO 3 (c-LNB)] and bulk potassium niobate [KNbO 3 (KNB)] crystals. Noncollinear phase matching in these materials allows for generation of pulses as broad as 2900 cm −1 (∼78 THz) centered in the near-IR at ∼1300 nm. In the particular geometry described here, the LNB crystal amplifies the white-light seed continuum, and the KNB crystal further amplifies the broadband near-IR pulses. Use of pulse-front matching at both nonlinear optical crystals allows for improvement of the spatiotemporal profile of the amplified ultrabroadband signal pulses and their compression to ≤22 fs. Because of the relatively high nonlinear coefficients of these crystals, we achieve overall amplification efficiencies >7% in two consecutive NOPA stages.
Self-trapping of low-energy infrared femtosecond beams in lithium niobate
Physical Review A, 2007
In this paper we report self-trapping of subnanojoule femtosecond near-infrared beams in photonic-grade undoped bulk lithium niobate under application of an external dc electric field. We show that the phenomenon occurs thanks to the photorefractive effect induced by a weak second-harmonic component generated under large velocity mismatch. It offers a way to extend lithium niobate's photorefractive response to the nearinfrared spectrum for peak intensity lower than 1 GW/ cm 2 , which is three orders of magnitude lower than reported in the literature.
High energy Yb:CaF 2 femtosecond laser for efficient terahertz generation in lithium niobate
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII, 2014
We present a study on THz generation in lithium niobate pumped by a powerful and versatile Yb:CaF 2 laser. The unique laser system delivers transform-limited pulses of variable duration (0.38-0.65 ps) with pulse energy of up to 15 mJ at a center wavelength of 1030 nm. From theoretical investigations it is expected that those laser parameters are ideally suited for efficient THz generation. Here we present experimental results on both the conversion efficiency and the THz spectral shape for variable pump pulse durations and for different crystal temperatures down to 25 K. We experimentally verify the optimum pump parameters for most efficient and broadband THz generation.
Conference on Lasers and Electro-Optics 2012, 2012
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