On the possibility of the nondegenerate parametric amplification of optical waves at low-frequency pumping

Chirkin, A. S.; Shutov, I. V.

doi:10.1134/s0021364007230014

Cited by 19 publications

(25 citation statements)

References 6 publications

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“…With increasing I 30 there is a rise in the intensity I 3 at the outlet from the RDS (compare the corresponding dotted and dashed curves). A similar variation in curves for crystalline LiNbO 3 (1)(2)(3)(4)(5)(6)(7)(8)(9) and 0 (11, 12), Ĩ 1 = 10 -3 (6-12), and 10 -4 (1-5), Ĩ 3 = 0 (1-5) and 10 -4 (6-12).…”

mentioning

confidence: 53%

“…A similar sequence of nonlinear interactions has been examined previously [7] for the case of two simultaneous coupled processes, neglecting phase effects.…”

mentioning

confidence: 88%

“…Efficient conversion of the frequency of laser light into optical harmonics and parametric waves can be realized in several ways: frequency conversion processes [5][6][7] inside the cavity of a laser; in an external Fabry-Perot cavity; in a layered structure (where the direction of the spontaneous polarization remains unchanged from layer to layer, but the sign of the phase detuning changes to the opposite); in a regular domain structure (RDS) with periodically polarized domain-layers; and, in layered structures where a combination of parametric gain and lasing at the sum frequency take place.…”

Section: 3mentioning

confidence: 99%

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Cascade parametric light amplification with low-frequency pumping

2010

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535.3Cascade parametric amplification in a regular domain structure is examined theoretically taking the variations in phase of all the interacting waves in a dissipative medium into account. Analytic expressions are obtained for the conversion efficiency of the laser energy with low-frequency pumping. The dependence of the parametric amplification efficiency on the number of layers is given. Ways of increasing the frequency conversion efficiency are discussed. The presence of a nonzero input intensity at the sum frequency is found to cause a nonlinear increase in the high-frequency signal at the output of the structure. As the losses of the interacting waves increase, both the frequency conversion efficiency and the optimum domain length decrease.Introduction. Parametric frequency conversion has been used to produce coherent radiation throughout the optical range. Frequency tuneable coherent radiation has widespread applications. Parametric frequency converters are used to study the spectroscopy of gases. In particular, parametric frequency converters have been used in lidars for laser probing of the atmosphere. With nonlinear processes for adding of frequencies, it is possible to transform IR radiation into visible radiation, and visible radiation into UV [1][2][3][4].In combination with frequency mixing effects, tuneable parametric sources of coherent radiation have made it possible greatly to extend the range of tuneable laser wavelengths. Thus, for example, using lasing at the sum frequency it is possible to obtain tuneable laser radiation at short wavelengths up to the vacuum ultraviolet [4].Although the possibility of essentially complete conversion of radiation at the fundamental wavelength into a harmonic has been demonstrated theoretically, we know that this can be done only when a whole series of requirements on the parameters of the beams and the nonlinear medium are met. Under the action of a strong pump wave, the spatial buildup of the nonlinear effect proceeds most actively with an optimum phase relationship between the interacting waves.Efficient conversion of the frequency of laser light into optical harmonics and parametric waves can be realized in several ways: frequency conversion processes [5][6][7] inside the cavity of a laser; in an external Fabry-Perot cavity; in a layered structure (where the direction of the spontaneous polarization remains unchanged from layer to layer, but the sign of the phase detuning changes to the opposite); in a regular domain structure (RDS) with periodically polarized domain-layers; and, in layered structures where a combination of parametric gain and lasing at the sum frequency take place.In this paper we examine the last of these methods for frequency conversion, i.e., a proposed five-layer structure in which cascade (stepwise) frequency conversion takes place.Initially, exponential parametric amplification of a signal wave takes place in the first layer. Then a process of nonlinear frequency conversion occurs in the next four layers, which form a regular doma...

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mentioning

confidence: 53%

“…A similar sequence of nonlinear interactions has been examined previously [7] for the case of two simultaneous coupled processes, neglecting phase effects.…”

mentioning

confidence: 88%

Section: 3mentioning

confidence: 99%

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Cascade parametric light amplification with low-frequency pumping

2010

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“…The wavevector mismatch for a few simultaneous parametric processes can be minimized due to QPM interactions; therefore, quadratic cascading is usually implemented in periodically poled nonlinear materials . In the presence of the quadratic cascading, the parametric amplification under a low‐frequency pump (PALFP), that is, amplification of the signal wave by a coherent pump wave of lower frequency, is possible too . Because concurrent execution of the phasematching is needed for a few parametrical processes, QPM materials are usually used for PALFP.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneous implementation of two QPM nonlinear‐optical interactions was investigated also in aperiodic nonlinear structures (ANPC) . In the work of Chirkin and Shutov, authors experimentally showed the possibility of implementation of nondegenerate parametric amplification under low‐frequency pump in ANPC, that is, the possibility of amplification of two waves with frequencies being higher than pump frequency. Recently, PALFP was realized both in a crystal composed of three sections (two sections being with QPM gratings and one section without ones) and in metamaterials .…”

Section: Introductionmentioning

confidence: 99%

Broadband noncollinear optical parametric amplification under low‐frequency picosecond pump in homogeneous KTP crystal

Vereshchagin

Morozov

Tunkin

2018

J Raman Spectroscopy

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The nature of cubic and cascaded quadratic nonlinear responses in the KTiOPO4 crystal under picosecond pump is studied. The main attention is paid to determination of the origin and properties of the blue radiation accompanying the red light amplification process (the central wavelength ~685 nm, bandwidth ~20 nm) in a noncollinear optical parametric amplifier (NOPA) pumped by the second‐harmonic radiation of the picosecond Nd:YAG laser (532 nm). In NOPA, the amplified seed radiation (ωs) becomes so intense that it can participate in any nonlinear three‐wave interaction and also can play the role of the Stokes wave in the in the coherent anti‐Stokes Raman scattering‐process in which powerful pump radiation (ωp) of the main parametric process serves both as the pump wave and the probe wave. Possible causes of the blue light emanating from the KTP crystal and the mechanisms for their realization are analyzed. We interpret the ring of blue light around the axis located between the directions of propagation of the green pump beam and the red beam of the amplified seed radiation, as the emission of amplified parametric fluorescence (signal wave) under low‐frequency pump. This phenomenon can be used for effective amplification in picosecond NOPA of weak anti‐Stokes radiation in the experiments with time‐resolved broadband picosecond coherent Anti‐Stokes Raman Scattering.

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Combined parametric down‐ and up‐conversion noncollinear processes under picosecond pumping in KTP, controlled by injection seeding

Vereshchagin

Morozov

et al. 2021

J Raman Spectroscopy

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A cascade mechanism of the emerging of a radiation in blue and red spectral ranges in the KTP crystal—combined non‐collinear parametric down‐ and up‐conversion—was discovered and experimentally investigated. To become observable this mechanism needs to be accompanied by a process of parametric amplification of the seeding wave. The non‐collinear optical parametric amplifier based on the KTP crystal, pumped by 532 nm picosecond pulses, was exploited to study combined noncollinear down‐conversion and up‐conversion processes. Narrowband seeding was provided by radiation of a picosecond optical parametric generator pumped by 355‐nm picosecond pulses synchronized with 532‐nm pulses. The corresponding phase matching conditions for both down‐ and up‐conversion stages were found out on the basis of the tuning curves calculated for the type II phase matching in the XOZ plane of the KTP crystal. When the wavelength and noncollinearity angle of the seeding matched any signal wave of the down‐conversion stage, the seeding was amplified. Along with this, a radiation appeared in the visible part of the spectrum, which was not observed without seeding amplification. The wavelengths and spatial patterns of the radiation arisen, corresponded to some phasematched processes of sum frequency generation between the signal and idler waves existing in the crystal at the down‐conversion stage. Being very weak, these processes are usually unobserved. Thus, injection seeding allows from plenty possible processes to reveal and highlight only those, which correspond to the noncollinearity angle and the wavelength of the seeding. This phenomenon potentially can be exploited to control light at the outlet of a nonlinear crystal.

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On the possibility of the nondegenerate parametric amplification of optical waves at low-frequency pumping

Cited by 19 publications

References 6 publications

Cascade parametric light amplification with low-frequency pumping

Cascade parametric light amplification with low-frequency pumping

Broadband noncollinear optical parametric amplification under low‐frequency picosecond pump in homogeneous KTP crystal

Combined parametric down‐ and up‐conversion noncollinear processes under picosecond pumping in KTP, controlled by injection seeding

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