Physics of Wave Phenomena最新文献

{"title":"LiNa5Mo9O30: A New Active Crystal for Ultrashort-Pulse SRS Lasers Featuring a Rare Frequency Shift of 947 cm–1","authors":"S. N. Smetanin,&nbsp;Yu. A. Kochukov,&nbsp;D. P. Tereshchenko,&nbsp;K. A. Gubina,&nbsp;A. G. Papashvili,&nbsp;V. E. Shukshin,&nbsp;N. A. Khokhlov,&nbsp;E. V. Yezhikova,&nbsp;V. V. Bulgakova,&nbsp;P. A. Chizhov,&nbsp;A. A. Ushakov","doi":"10.3103/S1541308X25600588","DOIUrl":"10.3103/S1541308X25600588","url":null,"abstract":"<p>Cubically nonlinear properties of a LiNa₅Mo₉O₃₀ crystal were studied under ultrafast laser excitation at a wavelength of 1030 nm with a peak power (&gt;4 MW) exceeding the critical power of self-focusing <i>P</i>_cr. Transient stimulated Raman scattering (SRS) in LiNa₅Mo₉O₃₀ was observed in competition with nonlinear effects associated with a nonlinear refractive index <i>n</i>₂. This competition was controlled by adjusting the external chirp of the pump pulses. A new fast method for measuring the nonlinear refractive index of Raman media using a change in the chirping of the pump pulse is proposed and compared with a known fast method using a change in the energy of the pump pulse. The proposed technique enabled measurement of <i>n</i>₂ = (6.5 ± 1.7) × 10^–16 cm²/W and <i>P</i>_cr = 1.4 ± 0.4 MW at 1030 nm for LiNa₅Mo₉O₃₀ with twice the accuracy of the previous method. Raman conversion into the Stokes wavelength occurred with an optical efficiency of up to 9%, accompanied by a blue (red) shift of the Stokes wavelength relative to the theoretical value of 1141 nm corresponding to the crystal’s Raman mode of 947 cm^–1 at the positive (negative) external chirp. This shift depended on the sign of the external chirp and arose due to the transient SRS regime, where the Stokes pulse was generated with a delay relative to the chirped pump pulse. This shift increased significantly for pump pulse durations shorter than 3 ps, owing to the internal chirp induced by nonlinear laser–matter interactions, including self-phase modulation of the pump and cross-phase modulation of the Stokes wave. Controlling the external chirp of the pump pulse enabled fine tuning of the Stokes peak wavelength in the range of 1129–1135 nm (for positive chirp) and 1143–1148 nm (for negative chirp).</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"100 - 107"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser Amplification of Ultrashort Radiation Pulses of a SrMoO4 Raman Generator Operating on Dual Raman Modes","authors":"S. N. Smetanin,&nbsp;D. P. Tereshchenko,&nbsp;A. G. Papashvili,&nbsp;Yu. A. Kochukov,&nbsp;K. A. Gubina,&nbsp;B. D. Ovcharenko,&nbsp;V. K. Bagdasarov,&nbsp;V. V. Bulgakova,&nbsp;P. A. Chizhov,&nbsp;A. A. Ushakov,&nbsp;V. E. Shukshin,&nbsp;V. A. Konyushkin,&nbsp;I. S. Voronina,&nbsp;L. I. Ivleva","doi":"10.3103/S1541308X2560062X","DOIUrl":"10.3103/S1541308X2560062X","url":null,"abstract":"<p>Hybrid master oscillator power amplifier laser systems have been proposed and experimentally implemented for laser amplification of ultrashort radiation pulses from a crystalline Raman generator operating in a highly transient regime on dual Raman modes with Stokes radiation wavelengths of 1.06 and 1.14 μm (frequency shifts 327 and 887 cm^–1, respectively). Experimental optimization of laser amplification has been carried out when controlling both the chirp of the pump pulse of the Raman generator and the polarization of the amplified laser radiation. The ultrashort pulses of the SrMoO₄ Raman generator with a wavelength of 1.06 μm were amplified in a regime of small-signal gain up to output energy of 200 μJ with a pulse duration of 2.2 ps in a system of two double-pass Nd³⁺:CaMoO₄ crystal laser amplifiers (the amplification linewidth of 3 nm) with lamp pumping at the radiation polarization parallel to the Nd³⁺:CaMoO₄ crystal optical axis. The adjustment of the rotation angle of the input radiation led, during the amplification, to the formation of double-wave radiation with wavelengths of 1061 and 1067 nm with each linewidth of 1.7 nm at a frequency difference of 1.6 THz, which is important for terahertz applications. The radiation of the same Raman generator with a wavelength of 1.14 μm was amplified in a regime of saturated gain up to 200–250 μJ, which is close to the amplifier stored energy, in an ultra-wideband (160 nm) double-pass laser amplifier based on a <span>({text{F}}_{2}^{ - }{:} {text{LiF}})</span> crystal with nanosecond laser pumping at optimization of chirping the pump pulse of the Raman generator. For the Raman generator pumped with a transform-limited pulse (0.25 ps), the spectrum width of the amplified radiation at 1.14 μm was the widest: 52 nm with output energy of amplified radiation of 200 μJ and the pulse duration of 0.8 ps with a compression capability of down to 40 fs.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"108 - 118"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of CaSn(OH)6 by Ultrasonic Dispersion","authors":"K. V. Azarov,&nbsp;N. V. Mashchenko,&nbsp;T. V. Bogdan,&nbsp;S. E. Bogorodskiy,&nbsp;M. A. Skiba,&nbsp;L. V. Bogdan,&nbsp;P. S. Lukyanov,&nbsp;V. I. Bogdan","doi":"10.3103/S1541308X26700044","DOIUrl":"10.3103/S1541308X26700044","url":null,"abstract":"<p>The influence of ultrasonic dispersion power on the morphology, texture characteristics, and phase composition of CaSn(OH)₆ samples synthesized by salt coprecipitation has been studied. The samples were characterized using X-ray diffraction analysis, scanning electron microscopy, and low-temperature nitrogen adsorption. The specific surface area of the samples is found to depend nonlinearly on the radiation power. Linear interpolation and Voigt fitting [1] were used to determine the linear sizes of crystallites according to the Scherrer principle [2]. The Keller–Miksis model [3] was used to calculate the critical bubble size at different impact powers and determine the “hot point” temperature at the instant of bubble collapse. It is shown that ultrasonic processing with a power density of 33 W/cm² provides the highest collapse temperature at the smallest sizes of cavitation bubble (548 µm); in this case, the CaSn(OH)₆ phase undergoes decomposition with the formation of calcium hydroxide Ca(OH)₂ and amorphous tin oxide SnO₂.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"150 - 160"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectroscopy of Intrinsic Radiation in the Far Infrared Range","authors":"N. V. Penkov","doi":"10.3103/S1541308X26700019","DOIUrl":"10.3103/S1541308X26700019","url":null,"abstract":"<p>The paper presents a new method of emission spectroscopy in the far infrared range. This method does not require heating or other excitation of the sample; that is, it allows recording the spectrum of intrinsic radiation. The spectra of lactose monohydrate, liquid water, and water vapor were recorded at room temperature. Emission bands corresponding to phonon vibrations of the crystal lattice of lactose monohydrate and rotational transitions of water molecules in the gas phase are recorded. For liquid water, the emission spectrum was recorded in the range of 7–200 cm^–1, and the potential for extension to the mid-infrared range was noted. A method has been developed for expressing the spectra of intrinsic radiation in absolute units of spectral radiosity. Spectroscopy of intrinsic radiation is as informative as absorption spectroscopy and does not require the use of a radiation source. This may be especially in demand for spectral analysis of radiation-sensitive samples.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"93 - 99"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of High γ-Radiation Doses on Thermoluminescent Properties of BGO Single Crystals","authors":"M. Kh. Ashurov,&nbsp;I. Nuritdinov,&nbsp;K. Kh. Saidakhmedov","doi":"10.3103/S1541308X26700020","DOIUrl":"10.3103/S1541308X26700020","url":null,"abstract":"<p>The effect of high γ-radiation doses on thermoluminescent properties of BGO single crystals is studied. It is shown that exposure to high γ-radiation doses results in formation of centers with deep trapping levels in the crystals. The high thermal stability of these centers indicates their structural origin. The nature of the centers is determined.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"119 - 123"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy and Momentum of an Electromagnetic Field in a Medium with Nonstationary Optical Properties","authors":"P. S. Ryzhikov,&nbsp;V. A. Makarov","doi":"10.3103/S1541308X25600771","DOIUrl":"10.3103/S1541308X25600771","url":null,"abstract":"<p>Intrinsic symmetry relations are obtained for components of optical susceptibility tensors of a nonabsorbing linear medium with the <i>n</i>th-order frequency dispersion (<i>n</i> = 1, 2, ...) and time-varying optical characteristics. They are used to find analytical expressions for all components of the energy–momentum tensor of the electromagnetic field of the waves propagating in the medium. In the case of the second- and higher-order frequency dispersion, formulas for electromagnetic field energy and momentum densities have, apart from the known additional terms, new terms involving time derivatives of medium optical susceptibility components.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"124 - 129"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Velocity and Attenuation of Acoustic Waves in Y3Al5O12 Crystals at High Temperatures","authors":"F. R. Akhmedzhanov,&nbsp;I. Sh. Toshpulatov","doi":"10.3103/S1541308X26700032","DOIUrl":"10.3103/S1541308X26700032","url":null,"abstract":"<p>The temperature dependences of the velocity and attenuation coefficient of longitudinal acoustic waves in pure and neodymium-doped yttrium–aluminum garnet (YAG) crystals have been studied in the temperature range of 290–450 K using the Williams–Lamb ultrasonic method at a frequency of 30 MHz. The temperature coefficients of the elastic constants <span>(c_{{11}}^{'})</span> and <span>(c_{{44}}^{'})</span> in these crystals were determined. It is shown that the attenuation of acoustic waves significantly changes in the investigated temperature range, especially in doped YAG crystals. It is found that, in the case of longitudinal acoustic waves, the maximum deviation of the energy flux from the wave vector is 0.8° for pure crystals and 2.8° for neodymium-doped crystals. Based on the measured values of the velocity and attenuation of acoustic waves, the real and imaginary components of the elasticity tensor were determined; this data make it possible to determine the velocity and attenuation coefficient of acoustic waves along any arbitrary direction in crystals.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 2","pages":"145 - 149"},"PeriodicalIF":1.1,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy Flux Deviation and Acoustic Attenuation Anisotropy in NaCl1−xBrx Crystals","authors":"F. R. Akhmedzhanov,&nbsp;F. B. Tugalov","doi":"10.3103/S1541308X25700426","DOIUrl":"10.3103/S1541308X25700426","url":null,"abstract":"<p>The energy flux deviation and anisotropy of acoustic wave attenuation in NaCl_1−<i>x</i>Br_<i>x</i> crystals has been investigated in the frequency range of 30–1200 MHz at room temperature. It is shown that the degree of change in the acoustic attenuation coefficient with increasing bromine content is caused by two factors: decrease in the relaxation time of thermal phonons and increase in the effective Grüneisen constant. All real and imaginary components of the elasticity tensor are determined based on experimental velocity and attenuation coefficient values. The anisotropy of the phase and group velocities of acoustic waves is analyzed, and special directions, along which pure and ordinary acoustic waves propagate, are revealed. A cross-section of the surface of acoustic-wave attenuation coefficient by the (110) plane is constructed for NaCl_0.7Br_0.3 crystals. It is shown that the highest attenuation anisotropy is observed for quasi-transverse acoustic waves, for which the attenuation coefficients along the [110] and [001] directions differ by an order of magnitude.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 1","pages":"70 - 74"},"PeriodicalIF":1.1,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifrequency Picosecond SRS Converter Operating in a Traveling Wave Mode","authors":"G. A. Boldin,&nbsp;S. M. Pershin,&nbsp;E. V. Shashkov,&nbsp;P. A. Sdvizhenskii,&nbsp;M. Ya. Grishin,&nbsp;V. N. Lednev,&nbsp;V. A. Orlovich,&nbsp;V. A. Zavozin","doi":"10.3103/S1541308X25600576","DOIUrl":"10.3103/S1541308X25600576","url":null,"abstract":"<p>We report the development of a stimulated Raman scattering (SRS) converter capable of generating ~10-ps pulses at several wavelengths simultaneously. For the first time, two-color SRS generation is demonstrated on O–H and C–H stretching vibrations in water–acetone and water–ethanol cascade systems. The SRS converter is pumped by 60-ps pulses of the Nd³⁺:YAP laser second harmonic in an unfocused beam (in traveling-wave mode). The spectral overlap of the generation bands indicates preamplification of the acetone Stokes component by SRS generation in water. The achieved results demonstrate the feasibility of creating multifrequency SRS converters operating in a traveling wave mode based on a combination of liquid gain media. These converters are promising for application in spectroscopy, chemical analysis, and as biharmonic sources for resonant pumping of nanoscale objects, such as viruses.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 1","pages":"85 - 91"},"PeriodicalIF":1.1,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Delay Effect in Pulsed Laser Ablation","authors":"I. A. Stuchebryukhov,&nbsp;A. A. Samokhin,&nbsp;P. A. Pivovarov,&nbsp;S. A. Abrosimov","doi":"10.3103/S1541308X25700402","DOIUrl":"10.3103/S1541308X25700402","url":null,"abstract":"<p>The long (multimicrosecond) delay of irradiated material ejection after exposure of metals to an intense subnanosecond pulse during laser ablation observed in 2003 is experimentally investigated. However, though afterward mentioned many times, this result has never been repeated, and its initial explanation is still unsatisfactory. In this work, the long delays in ejection of a material under exposure of metal targets (aluminum, copper, lead) to a laser pulse with the duration of 70 ps, wavelength of 0.527 µm, and intensity <i>I</i> ≈ 10¹³ W/cm² are confirmed using the two-beam time-of-flight method. It is stressed that the explanation of this effect based on the notion of a delayed phase explosion alone is insufficient and that cavitation phenomena subsequently arising in the melt layer should be taken into account.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"34 1","pages":"43 - 48"},"PeriodicalIF":1.1,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}