Publications by authors named "Valeriy Badikov"

13 Publications

  • Page 1 of 1

Few-cycle mid-infrared pulses from BaGaGeSe.

Opt Lett 2020 Jul;45(13):3813-3815

(BGGSe) is a newly developed nonlinear material that is attractive for ultrabroad frequency mixing and ultrashort pulse generation due to its comparably low dispersion and high damage threshold. A numerical study shows the material's capacity for octave-spanning mid-infrared pulse generation up to 18 µm. In a first experiment, we show that a long crystal length of 2.6 mm yields a pulse energy of 21 pJ at 100 MHz with a spectral bandwidth covering 5.8 to 8.5 µm. The electric field of the carrier-envelope-phase stable pulse is directly measured with electro-optical sampling and reveals a pulse duration of 91 fs, which corresponds to sub-four optical cycles, thus confirming some of the prospects of the material for ultrashort pulse generation and mid-infrared spectroscopy.
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http://dx.doi.org/10.1364/OL.397981DOI Listing
July 2020

Effective nonlinearity of the new quaternary chalcogenide crystal BaGaGeSe.

Opt Lett 2020 Apr;45(8):2136-2139

The unknown magnitude and relative signs of the trigonal crystal ${\rm BaGa}_{2}{\rm GeSe}_{6}$BaGaGeSe nonlinear coefficients have hindered defining an optimum orientation for maximum frequency conversion efficiency. This issue is resolved in the present work, obtaining ${d_{11}}= + {23.6}$d=+23.6, ${d_{22}}= - {18.5}$d=-18.5, and ${d_{31}}= + {18.3}\;{\rm pm/V}$d=+18.3pm/V for frequency doubling of the 10.591 µm radiation.
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http://dx.doi.org/10.1364/OL.388373DOI Listing
April 2020

Thermo-optic dispersion formula for BaGaGeSe.

Appl Opt 2019 Dec;58(35):9709-9711

A thermo-optic dispersion formula for ${{\rm BaGa}_2}{{\rm GeSe}_6}$BaGaGeSe nonlinear crystal is reported. The experimentally determined temperature-dependent phase-matching conditions for second-harmonic and sum-frequency generation of Nd:YAG laser-pumped ${{\rm KTiOPO}_4}$KTiOPO (KTP) and ${{\rm RbTiOAsO}_4}$RbTiOAsO (RTA) optical parametric oscillators as well as a ${{\rm CO}_2}$CO laser and its harmonics in the 0.805-10.5910 µm range are precisely reproduced by the formula when combined with the Sellmeier equations previously reported by the present authors [Appl. Opt.57, 7440 (2018)APOPAI0003-693510.1364/AO.57.007440].
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http://dx.doi.org/10.1364/AO.58.009709DOI Listing
December 2019

Phase-matching properties of BaGaGeSe for three-wave interactions in the 0.778-10.5910 μm spectral range.

Appl Opt 2018 Sep;57(26):7440-7443

We present new experimental results for the phase-matching properties of the recently discovered BaGaGeSe crystal for harmonic generation of a Nd:YAG laser-pumped KTP OPO and a CO laser in the 0.778-10.5910 μm spectral range. In addition, we present new Sellmeier equations that provide a good reproduction of the present experimental results as well as the published data points for SHG of a CO laser at 10.5910 μm and a 1.85 μm-pumped OPO in the 2.156-3.220 μm and 4.348-13.035 μm spectral ranges.
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http://dx.doi.org/10.1364/AO.57.007440DOI Listing
September 2018

Thermo-optic dispersion formula for BaGaSe.

Appl Opt 2018 Apr;57(11):2935-2938

This paper reports on the thermo-optic dispersion formula for BaGaSe that provides a good reproduction of the temperature-dependent phase-matching conditions for type-1 and type-2 second-harmonic generation of a Nd:YAG laser-pumped AgGaS optical parametric oscillator (OPO) and a CO laser in the 0.901-10.5910 μm spectral range, as well as the published data points for a Nd:YAG laser-pumped OPO at λ=3.9040  μm when combined with the Sellmeier equations of the present authors [Appl. Opt.56, 2978 (2017)APOPAI0003-693510.1364/AO.56.002978].
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http://dx.doi.org/10.1364/AO.57.002935DOI Listing
April 2018

Intracavity difference-frequency mixing of optical parametric oscillator signal and idler pulses in BaGa4Se7.

Appl Opt 2017 Apr;56(10):2783-2786

An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064 μm pumped Rb:PPKTP optical parametric oscillator in BaGa4Se7. In this way, a pulse energy of ∼0.71  mJ is generated at ∼7  μm for a repetition rate of 100 Hz. Tuning of the mid-IR radiation is demonstrated by heating of the Rb:PPKTP crystal.
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http://dx.doi.org/10.1364/AO.56.002783DOI Listing
April 2017

Widely tunable in the mid-IR BaGa4Se7 optical parametric oscillator pumped at 1064  nm.

Opt Lett 2016 Aug;41(15):3667-70

A BaGa4Se7 nanosecond optical parametric oscillator (OPO) shows extremely wide idler tunability in the mid-IR (2.7-17 μm) under 1.064 μm pumping. The ∼10  ns pulses at ∼7.2  μm have an energy of 3.7 mJ at 10 Hz. The pump-to-idler conversion efficiency for this wavelength reaches 5.9% with a slope of 6.5% corresponding to a quantum conversion efficiency or pump depletion of 40%.
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http://dx.doi.org/10.1364/OL.41.003667DOI Listing
August 2016

Phase-matching directions and refined Sellmeier equations of the monoclinic acentric crystal BaGa4Se7.

Opt Lett 2016 Jun;41(12):2731-4

We directly measured the phase-matching directions of second-harmonic and difference frequency generation in the principal planes of the biaxial BaGa4Se7 (BGSe) crystal using the sphere method. The simultaneous fit of the data allowed us to refine the Sellmeier equations of the three principal refractive indices of BGSe, and to calculate the tuning curves for infrared optical parametric generation.
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http://dx.doi.org/10.1364/OL.41.002731DOI Listing
June 2016

Angle noncritical phase-matched second-harmonic generation in the monoclinic crystal BaGa₄Se₇.

Opt Lett 2015 Oct;40(20):4591-4

We performed a complete study of angle noncritical phase-matched second-harmonic generation in BaGa4Se7 in the mid-infrared region. We measured the dielectric frame orientation and showed that it does not rotate as a function of wavelength. We determined the phase-matching wavelengths and the associated spectral and angular acceptances along the x and y axes of the dielectric frame. We also estimated the magnitude of the nonlinear coefficients involved.
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http://dx.doi.org/10.1364/OL.40.004591DOI Listing
October 2015

Difference-frequency generation of ultrashort pulses in the mid-IR using Yb-fiber pump systems and AgGaSe(2).

Opt Express 2015 Feb;23(3):2730-6

We employ AgGaSe(2) for difference-frequency generation between signal and idler of synchronously-pumped picosecond / femtosecond OPOs at 80 / 53 MHz. Continuous tuning in the picosecond regime is achieved from 5 to 18 µm with average power of 140 mW at 6 µm. In the femtosecond regime the tunability extends from 5 to 17 µm with average power of 69 mW at 6 µm. Maximum single pulse energies of >1 nJ in both cases represent the highest values at such high repetition rates.
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http://dx.doi.org/10.1364/OE.23.002730DOI Listing
February 2015

Mid-infrared rotated image singly resonant twisted rectangle optical parametric oscillator based on HgGa(2)S(4) pumped at 1064 nm.

Appl Opt 2014 Nov;53(33):7951-62

We compare linear, planar ring, and rotated image singly resonant twisted rectangle (RISTRA) type nanosecond optical parametric oscillator cavities using HgGa2S4 nonlinear crystal pumped by 8 ns pulses at 1064 nm from a low beam quality pump source. The input-output characteristics and the output idler beam quality at 6300 nm are compared for two values of the pump beam diameter presenting different cavity Fresnel numbers and magnitudes of the spatial walk-off effect due to birefringence. The RISTRA cavity ensures in all cases a circular output beam profile but is advantageous in terms of beam quality with respect to the planar ring only at a large pump beam diameter.
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http://dx.doi.org/10.1364/AO.53.007951DOI Listing
November 2014

Narrow bandwidth, picosecond, 1064  nm pumped optical parametric generator for the mid-IR based on HgGa₂S₄.

Opt Lett 2014 Aug;39(16):4895-8

We report on optical parametric generation in a mercury thiogallate (HgGa2S4) crystal pumped by 16 ps, 1064 nm pulses at 250 kHz. A broad tuning range extending from 1.19 to 1.47 μm (signal) and from 3.85 to 10 μm (idler) is achieved. Narrow bandwidth, quasi-Fourier limited operation with high beam quality for the signal/idler pulses and >14% pump depletion is obtained by continuous wave seed injection at 1.29 μm.
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http://dx.doi.org/10.1364/OL.39.004895DOI Listing
August 2014

Midinfrared optical parametric oscillator based on the wide-bandgap BaGa4S7 nonlinear crystal.

Opt Lett 2012 Oct;37(19):4146-8

Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Strasse, D-12489 Berlin, Germany.

The orthorhombic biaxial crystal BaGa(4)S(7) has been employed in a 1064 nm pumped optical parametric oscillator generating <6 ns long idler pulses with energies as high as 0.5 mJ at 6.217 μm and average power of ~50 mW at 100 Hz. Notwithstanding the relatively low nonlinearity, ~3 times above threshold operation has been achieved at pump intensities more than 5 times below the crystal surface damage limit.
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http://dx.doi.org/10.1364/OL.37.004146DOI Listing
October 2012