Irina Sorokina - Academia.edu (original) (raw)
Papers by Irina Sorokina
Optics Letters
We report the soft-aperture Kerr-lens mode-locked Cr:ZnS laser, generating 550 mW of 69 fs nearly... more We report the soft-aperture Kerr-lens mode-locked Cr:ZnS laser, generating 550 mW of 69 fs nearly transform-limited pulses at 2.39 μm wavelength. The pulse energy reached 3.8 nJ at 145 MHz repetition rate, limited by the onset of double-pulsing. This corresponds to the shortest-pulse and highest-energy direct femtosecond laser source in the mid-infrared. Dispersion compensation was achieved by a single chirped mirror and a thin sapphire plate, making the laser design simple, compact and very stable, and operating at ambient air and room temperature. The superb thermal and mechanical properties of Cr:ZnS, exceeding those of Cr:ZnSe and many established femtosecond laser crystals, should allow for further scaling of output power.
ABSTRACT form only given. Femtosecond coherent light sources emitting in the mid-infrared are of ... more ABSTRACT form only given. Femtosecond coherent light sources emitting in the mid-infrared are of particular interest for a number of applications like environmental sensing, medicine, metrology, material processing and telecommunications. Among the alternatives, Cr-doped chalcogenide-based crystalline lasers are the most compact, robust and cheap.For decade pulse energy of these lasers were limited at the level of 1-2 nJ. Finally Cr:ZnS laser with 3.8 nJ pulse energy and 550 mW average output power producing 69-fs pulses was demonstrated very recently [1]. Power scaling of femtosecond crystalline oscillators is not a simple task. The pulse energy of these systems is limited by the pulse breakup due to high third-order optical nonlinearity of the active medium. Increasing the output power over the certain limit result in either multiple-pulsing or harmonic mode-locking regimes. In order to overcome that, the intracavity power density inside the active medium should be reduced. That could be done by using the technique of chirped-pulse-oscillator (CPO). This technique is well-established in fiber and Tisapphire lasers, and has recently been demonstrated with the Cr:YAG and Yb-doped thin-disk lasers. For Cr:ZnSe the analytical theory [2] predicts pulse energies up to 0.5 μJ [3] and initial demonstration of CPO technique has already been performed for Cr:ZnSe as well as Cr:ZnS lasers [4]. We report the successful demonstration of Cr:ZnS CPO pulse energy over 8 nJ. The laser was build on the basis of a classic 4-mirror astigmatically-compensated cavity and was pumped by 1.61 μm cw polarized 5-W Er:fiber laser. The mode-locking was achieved using soft-aperture Kerr lens effect. The compensation of the group-delay dispersion was performed by the chirped mirror. The pulses having the duration ranging from 0.8 to 2 picoseconds were obtained at the pulse repetition rate of 105 MHz. The laser average output power reached 0.88 W with 26% slope efficiency. At out- ut powers over 750 mW we observe leakage of 3-5 % of energy into higher-order modes, visible as the narrow spectral lines. The input-output curve, typical autocorrelation trace, and laser emission spectra for different output pulse energies are shown in the Figure 1.
Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical t... more Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical technology. In this paper we demonstrate nonlinear-optical enhancement and shape control of atmospheric absortion lines using a broadband ultrashort-pulse oscillator and nonlinear fiber propagation. The absorption signal is generated inside the passively mode-locked mid-IR Cr:ZnS laser. The nonlinear interaction with the broadband ps-long pulse causes the narrow-band ns-long absorption signal to acquire a 90° phase shift with respect to the pulse [1]. The signature of such an absorber on the output spectrum is a dispersion-like modulation, which can be much stronger than absorption modulation itself. This effect has been experimentally observed using the atmospheric water vapour absorption lines around 2.5 μm in Cr:ZnSe laser [1, 2]. Additional modulation increase has been predicted to occur near the spectrum edge if the laser is operating in a chirped-pulse (dissipative soliton) regime.
Simple Kerr-lens mode-locked Cr:LiSrGaF laser, containing no intracavity prisms has been demonstr... more Simple Kerr-lens mode-locked Cr:LiSrGaF laser, containing no intracavity prisms has been demonstrated for the first time. The laser produced stable near transform-limited 47 fs pulses with an output power of 100 mW. The low-loss Gires-Tournois structured dielectric mirrors were used for dispersion control. The measured group-delay dispersion of the active medium as well as of the mirrors allowed to identify the origin of the narrow spectral side-band.
Russian Journal of Bioorganic Chemistry
Modification of naphthoquinonlevopimaric acid was carried out by introducing of propargylamino re... more Modification of naphthoquinonlevopimaric acid was carried out by introducing of propargylamino residues. Anti-inflammatory activity Mannich bases were studied.
We report a Cr2+:ZnS laser for broadband ultrasensitive intracavity laser spectroscopy, with effe... more We report a Cr2+:ZnS laser for broadband ultrasensitive intracavity laser spectroscopy, with effective absorption path up to about 50 km in the 2.4 µm range. The spectrometer operates with both Er-fiber and direct diode pumping.
Topics in Applied Physics, 2003
... m2) is the reduced mass for two bodies m1,m2 vibrating with an elastic restoring force k ... ... more ... m2) is the reduced mass for two bodies m1,m2 vibrating with an elastic restoring force k ... The important physical properties of the popular glasses used for optical fibers are shown in ... and be incorporated in the host in several oxidation states with different spectroscopic properties. ...
The spectral broadening of the 50 femtosecond pulses from the Cr:YAG laser at 1.5 μm in a tapered... more The spectral broadening of the 50 femtosecond pulses from the Cr:YAG laser at 1.5 μm in a tapered fiber with 1.4 μm taper waist diameter is observed. The broadening mechanism around the second dispersion zero is studied experimentally and numerically.
Journal of Medical Genetics, 1999
A moderately mentally retarded 3 year old boy showed minor anomalies including a prominent forehe... more A moderately mentally retarded 3 year old boy showed minor anomalies including a prominent forehead and flat occiput, exophthalmos, large and prominent ears, high arched palate, umbilical hernia, sacral dimple, and irregular position of the toes. Cardiac sonography disclosed a chorda running through the left ventricle. Cytogenetic investigation of the family showed a balanced insertional translocation of segment 1p13→p22 into
Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178), 1998
ABSTRACT Summary form only given. The diode laser and Ti:sapphire laser pumped cw broadly tunable... more ABSTRACT Summary form only given. The diode laser and Ti:sapphire laser pumped cw broadly tunable (80 nm) and efficient (16% of slope efficiency) laser action was obtained in a new laser material at room temperature and compared with other common Tm,Ho-doped laser crystals. In the mode-locked regime, 25-ps pulses at 100-mW of average output power and 100-MHz repetition rate have been obtained. Preliminary results show a large potential of this Cr,Tm,Ho:YScGG/GdScAG laser for mode-locking
Conference on Lasers and Electro-Optics 2010, 2010
ABSTRACT A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectro... more ABSTRACT A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured within 10 µs with 12 GHz resolution.
Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 t... more Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth.
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, 2006
Advanced Solid-State Lasers, 2001
Bulletin of experimental biology and medicine, 2015
Toxic liver injury with the development of fibrosis and cirrhosis was modeled in Wistar rats by i... more Toxic liver injury with the development of fibrosis and cirrhosis was modeled in Wistar rats by intragastric administration of 0.1 ml/kg CCl4 in combination with 5% ethanol with glucose 3 times a week for 6 weeks. The animals were treated with betulonic acid amide (50 mg/kg in Tween aqueous solution) and heptral (6 mg/kg) as hepatoprotective compounds. It was found that betulonic acid amide stimulated the regenerative response in hepatocytes under conditions of combined toxic exposure and promoted recovery of their qualitative and quantitative characteristics, which was accompanied by a significant decrease in the severity of liver fibrosis and the absence of cirrhotic transformation of the liver.
Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian
Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian
Optics Letters
We report the soft-aperture Kerr-lens mode-locked Cr:ZnS laser, generating 550 mW of 69 fs nearly... more We report the soft-aperture Kerr-lens mode-locked Cr:ZnS laser, generating 550 mW of 69 fs nearly transform-limited pulses at 2.39 μm wavelength. The pulse energy reached 3.8 nJ at 145 MHz repetition rate, limited by the onset of double-pulsing. This corresponds to the shortest-pulse and highest-energy direct femtosecond laser source in the mid-infrared. Dispersion compensation was achieved by a single chirped mirror and a thin sapphire plate, making the laser design simple, compact and very stable, and operating at ambient air and room temperature. The superb thermal and mechanical properties of Cr:ZnS, exceeding those of Cr:ZnSe and many established femtosecond laser crystals, should allow for further scaling of output power.
ABSTRACT form only given. Femtosecond coherent light sources emitting in the mid-infrared are of ... more ABSTRACT form only given. Femtosecond coherent light sources emitting in the mid-infrared are of particular interest for a number of applications like environmental sensing, medicine, metrology, material processing and telecommunications. Among the alternatives, Cr-doped chalcogenide-based crystalline lasers are the most compact, robust and cheap.For decade pulse energy of these lasers were limited at the level of 1-2 nJ. Finally Cr:ZnS laser with 3.8 nJ pulse energy and 550 mW average output power producing 69-fs pulses was demonstrated very recently [1]. Power scaling of femtosecond crystalline oscillators is not a simple task. The pulse energy of these systems is limited by the pulse breakup due to high third-order optical nonlinearity of the active medium. Increasing the output power over the certain limit result in either multiple-pulsing or harmonic mode-locking regimes. In order to overcome that, the intracavity power density inside the active medium should be reduced. That could be done by using the technique of chirped-pulse-oscillator (CPO). This technique is well-established in fiber and Tisapphire lasers, and has recently been demonstrated with the Cr:YAG and Yb-doped thin-disk lasers. For Cr:ZnSe the analytical theory [2] predicts pulse energies up to 0.5 μJ [3] and initial demonstration of CPO technique has already been performed for Cr:ZnSe as well as Cr:ZnS lasers [4]. We report the successful demonstration of Cr:ZnS CPO pulse energy over 8 nJ. The laser was build on the basis of a classic 4-mirror astigmatically-compensated cavity and was pumped by 1.61 μm cw polarized 5-W Er:fiber laser. The mode-locking was achieved using soft-aperture Kerr lens effect. The compensation of the group-delay dispersion was performed by the chirped mirror. The pulses having the duration ranging from 0.8 to 2 picoseconds were obtained at the pulse repetition rate of 105 MHz. The laser average output power reached 0.88 W with 26% slope efficiency. At out- ut powers over 750 mW we observe leakage of 3-5 % of energy into higher-order modes, visible as the narrow spectral lines. The input-output curve, typical autocorrelation trace, and laser emission spectra for different output pulse energies are shown in the Figure 1.
Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical t... more Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical technology. In this paper we demonstrate nonlinear-optical enhancement and shape control of atmospheric absortion lines using a broadband ultrashort-pulse oscillator and nonlinear fiber propagation. The absorption signal is generated inside the passively mode-locked mid-IR Cr:ZnS laser. The nonlinear interaction with the broadband ps-long pulse causes the narrow-band ns-long absorption signal to acquire a 90° phase shift with respect to the pulse [1]. The signature of such an absorber on the output spectrum is a dispersion-like modulation, which can be much stronger than absorption modulation itself. This effect has been experimentally observed using the atmospheric water vapour absorption lines around 2.5 μm in Cr:ZnSe laser [1, 2]. Additional modulation increase has been predicted to occur near the spectrum edge if the laser is operating in a chirped-pulse (dissipative soliton) regime.
Simple Kerr-lens mode-locked Cr:LiSrGaF laser, containing no intracavity prisms has been demonstr... more Simple Kerr-lens mode-locked Cr:LiSrGaF laser, containing no intracavity prisms has been demonstrated for the first time. The laser produced stable near transform-limited 47 fs pulses with an output power of 100 mW. The low-loss Gires-Tournois structured dielectric mirrors were used for dispersion control. The measured group-delay dispersion of the active medium as well as of the mirrors allowed to identify the origin of the narrow spectral side-band.
Russian Journal of Bioorganic Chemistry
Modification of naphthoquinonlevopimaric acid was carried out by introducing of propargylamino re... more Modification of naphthoquinonlevopimaric acid was carried out by introducing of propargylamino residues. Anti-inflammatory activity Mannich bases were studied.
We report a Cr2+:ZnS laser for broadband ultrasensitive intracavity laser spectroscopy, with effe... more We report a Cr2+:ZnS laser for broadband ultrasensitive intracavity laser spectroscopy, with effective absorption path up to about 50 km in the 2.4 µm range. The spectrometer operates with both Er-fiber and direct diode pumping.
Topics in Applied Physics, 2003
... m2) is the reduced mass for two bodies m1,m2 vibrating with an elastic restoring force k ... ... more ... m2) is the reduced mass for two bodies m1,m2 vibrating with an elastic restoring force k ... The important physical properties of the popular glasses used for optical fibers are shown in ... and be incorporated in the host in several oxidation states with different spectroscopic properties. ...
The spectral broadening of the 50 femtosecond pulses from the Cr:YAG laser at 1.5 μm in a tapered... more The spectral broadening of the 50 femtosecond pulses from the Cr:YAG laser at 1.5 μm in a tapered fiber with 1.4 μm taper waist diameter is observed. The broadening mechanism around the second dispersion zero is studied experimentally and numerically.
Journal of Medical Genetics, 1999
A moderately mentally retarded 3 year old boy showed minor anomalies including a prominent forehe... more A moderately mentally retarded 3 year old boy showed minor anomalies including a prominent forehead and flat occiput, exophthalmos, large and prominent ears, high arched palate, umbilical hernia, sacral dimple, and irregular position of the toes. Cardiac sonography disclosed a chorda running through the left ventricle. Cytogenetic investigation of the family showed a balanced insertional translocation of segment 1p13→p22 into
Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178), 1998
ABSTRACT Summary form only given. The diode laser and Ti:sapphire laser pumped cw broadly tunable... more ABSTRACT Summary form only given. The diode laser and Ti:sapphire laser pumped cw broadly tunable (80 nm) and efficient (16% of slope efficiency) laser action was obtained in a new laser material at room temperature and compared with other common Tm,Ho-doped laser crystals. In the mode-locked regime, 25-ps pulses at 100-mW of average output power and 100-MHz repetition rate have been obtained. Preliminary results show a large potential of this Cr,Tm,Ho:YScGG/GdScAG laser for mode-locking
Conference on Lasers and Electro-Optics 2010, 2010
ABSTRACT A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectro... more ABSTRACT A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured within 10 µs with 12 GHz resolution.
Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 t... more Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth.
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, 2006
Advanced Solid-State Lasers, 2001
Bulletin of experimental biology and medicine, 2015
Toxic liver injury with the development of fibrosis and cirrhosis was modeled in Wistar rats by i... more Toxic liver injury with the development of fibrosis and cirrhosis was modeled in Wistar rats by intragastric administration of 0.1 ml/kg CCl4 in combination with 5% ethanol with glucose 3 times a week for 6 weeks. The animals were treated with betulonic acid amide (50 mg/kg in Tween aqueous solution) and heptral (6 mg/kg) as hepatoprotective compounds. It was found that betulonic acid amide stimulated the regenerative response in hepatocytes under conditions of combined toxic exposure and promoted recovery of their qualitative and quantitative characteristics, which was accompanied by a significant decrease in the severity of liver fibrosis and the absence of cirrhotic transformation of the liver.
Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian
Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian