In this section you may find selected articles with experimental results having been obtained with the use of our equipment.
- Ti:sapphire laser synchronised with femtosecond Yb pump laser via nonlinear pulse coupling in Ti:sapphire active medium
- Femtosecond Er3+ fiber laser for application in an optical clock
- Efficient source of femtosecond pulses and its use for broadband supercontinuum generation
- Self-mode-locking in erbium-doped fibre lasers with saturable polymer film absorbers containing single-wall carbon nanotubes synthesised by the arc discharge method
N.V. Didenko, A. V. Konyashchenko, D. A. Konyashchenko, P. V. Kostryukov, I. I. Kuritsyn, A. P. Lutsenko, A. O. Mavritskiy
A laser system utilising the method of synchronous pumping of a Ti : sapphire laser by a high-power femtosecond Yb3+-doped laser is described. The pulse repetition rate of the Ti : sapphire laser is successfully locked to the repetition rate of the Yb laser for more than 6 hours without the use of any additional electronics. The measured timing jitter is shown to be less than 1 fs. A simple qualitative model addressing the synchronisation mechanism utilising the cross-phase modulation of oscillation and pump pulses within a Ti : sapphire active medium is proposed. Output parameters of the Ti : sapphire laser as functions of its cavity length are discussed in terms of this model. A laser system utilising the method of synchronous pumping of a Ti : sapphire laser by a high-power femtosecond Yb3+-doped laser is described. The pulse repetition rate of the Ti : sapphire laser is successfully locked to the repetition rate of the Yb laser for more than 6 hours without the use of any additional electronics. The measured timing jitter is shown to be less than 1 fs. A simple qualitative model addressing the synchronisation mechanism utilising the cross-phase modulation of oscillation and pump pulses within a Ti : sapphire active medium is proposed. Output parameters of the Ti : sapphire laser as functions of its cavity length are discussed in terms of this model.
Keywords: synchronous pumping, femtosecond pumping, Ti:sapphire laser, cross-phase modulation.
M. A. Gubin, A. N. Kireev, A. V. Tausenev, A. V. Konyashchenko, P. G. Kryukov, D. A. Tyurikov, A. S. ShelkovikovThe main elements needed for the realization of a compact femtosecond methane optical clock are developed and studied. A femtosecond laser system on an Er3+ fiber (λ = 1.55 μm) contains an oscillator, an amplifier, and a fiber with a relatively high nonlinearity in which the supercontinuum radiation is generated in the range 1–2 μm. In the supercontinuum spectrum, the fragments separated by an interval that is close to the methane-optical reference frequency (λ = 3.39 μm) exhibit an increase in intensity. The supercontinuum radiation is converted into the difference frequency in a nonlinear crystal to the range of the methane-reference frequency (λ = 3.3–3.5 μm), so that the frequency components of the transformed spectrum have sufficient intensities for the subsequent frequency-phase stabilization with respect to the methane reference. A system that stabilizes the pulse repetition rate of the femtosecond Er3+laser is also employed. Thus, the repetition rate of the ultrashort pulses of the femtosecond fiber laser is locked to the methane reference. The pulse repetition rate is compared with the standard second. Thus, the scheme of an optical clock is realized.
Anton V. Tausenev, P. G. Kryukov, M. M. Bubnov, M. E. Likhachev, E. Yu. Romanova, M. V. Yashkov, V. F. Khopin and M. Yu. SalganskiiA femtosecond Er3+-doped fibre laser system is developed and studied. The system contains a master oscillator operating in the pulse stretching regime, an amplifier of chirped pulses, and a device for pulse compression. The laser emits 1.55-μm, 100-fs, 90-mW pulses with a pulse repetition rate of 25 MHz. The setup was used for supercontinuum generation in an optical fibre heavily doped with GeO2. The width of the generated supercontinuum was close to an octave.
Anton V. Tausenev, Elena D. Obraztsova, A. S. Lobach, A. I. Chernov, Vitalii I. Konov, Aleksandr V. Konyashchenko, P. G. Kryukov and Evgenii M DianovWe studied the ring and linear schemes of erbium-doped fibre lasers in which passive mode locking was achieved with the help of saturable absorbers made of high-optical quality films based on cellulose derivatives with dispersed single-wall carbon nanotubes. The films were prepared by the original method with the use of nanotubes synthesised by the arc discharge method. The films exhibit nonlinear absorption at a wavelength of 1.5 μm. Pulses in the form of optical solitons of duration 1.17 ps at a avelength of 1.56 μm were generated in the ring scheme of the erbium laser. The average output power was 1.1 mW at a pulse repetition rate of 20.5 MHz upon pumping by the 980-nm, 25-mW radiation from a laser diode. The pulse duration in the linear scheme was reduced to 466 fs for the output power up to 4 mW and a pulse repetition rate of 28.5 MHz. The specific feature of these lasers is a low pump threshold in the regime of generation of ultrashort pulses.
- Multiterawatt Hybrid (Solid/Gas) Femtosecond Systems in the Visible (Chapter 6 from High Energy and Short Pulse Lasers)
- Femtosecond Laser Simulation Facility for SEE IC Testing
Leonid D. Mikheev and Valery F. Losev (2016). Multiterawatt Hybrid (Solid/Gas) Femtosecond Systems in the Visible, High Energy and Short Pulse Lasers, Dr. Richard Viskup (Ed.), InTech, DOI: 10.5772/63972.A novel hybrid (solid/gas) approach to the development of femtosecond high‐intensity laser systems operating in the visible is presented in this chapter. Behind this approach is a combination of a solid‐state front end relying on widespread and highly developed techniques for femtosecond pulse generation in the near infrared with a photochemically driven boosting amplifier operating in the visible spectral range. Historical background of developing photochemically pumped gas lasers on broad bandwidth electronic transitions in molecules and physical principles of their operation are briefly summarized as well. The architecture and the design issues of the hybrid femtosecond systems relying on the amplification of the second harmonic of Ti:sapphire front ends in the photodissociation XeF(C‐A) power‐boosting amplifiers driven by the VUV radiation from electron‐beam‐to‐VUV‐flash converters are described, as well as breakthrough results of proof‐of‐principle experiments demonstrating a high potential of the hybrid approach. Wavelength scaling of laser‐matter interaction is shortly discussed to demonstrate advantages of shorter driver wavelengths for some applications with main emphasis placed on recombination‐pumped soft X‐ray lasers.
A. N. Egorov et al., "Femtosecond Laser Simulation Facility for SEE IC Testing," 2014 IEEE Radiation Effects Data Workshop (REDW), Paris, 2014, pp. 1-4. doi: 10.1109/REDW.2014.7004570Abstract: The new SEE laser simulation facility based on femtosecond laser source with tunable pulse duration is presented, and its most important features are discussed. The influence of laser pulse duration on simulation results is observed.
- Contrast degradation in a chirped-pulse amplifier due to generation of prepulses by postpulses
N.V. Didenko, A.V. Konyashchenko, A.P. Lutsenko, and S.Yu. TenyakovExperiment and modeling show that the refractive index nonlinearity can significantly degrade the contrast of a chirped-pulse amplifier seeded with a pulse and a single postpulse. Multiple powerful non-equidistant pre- and postpulses are generated. For a Gaussian pulse and a hat-top beam, an incident postpulse of energy W results in a prepulse of energy 0.58B^2 W, where B is the nonlinear phase (B-integral) of the main pulse. Calculations show that level of satellites due to gain saturation is negligibly small. Experimental results for Ti:Sapphire regenerative and multipass amplifiers and prepulse generation in fused silica agree well with the theory.
- Efficient amplification of a femtosecond Ti:sapphire laser with a ring regenerative amplifier
Wei Zhang, Hao Teng, Zhaohua Wang, Zhongwei Shen, and Zhiyi Wei, Appl. Opt. 52, 1517-1522 (2013).A high-stability and high-efficiency ring Ti:sapphire regenerative amplifier is demonstrated based on a double-gating pulse picker at a repetition rate of 1 kHz. Pulse energy up to 5.7 mJ is obtained using a pump energy of 20.0 mJ at 527 nm, corresponding to a relatively high slope efficiency of 30.3%. After a grating compressor, the laser pulse is compressed to 37.2 fs with an energy of 4.1 mJ. The beam quality factors are 1.4 and 1.3 in tangential and sagittal directions, respectively. The measured root mean square energy stability is better than 0.31% over an 11 h period.
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Avesta is participating in the “LASER World of PHOTONICS 2017” (Munich, Germany, 26-29 June 2017) trade show. Feel free to drop by our booth B2.151 to see the TeMa Yb laser system along with the AA-20 autocorrelator and GECON supercontinuum generator. The trade show participation is supported by the Russian Export Center and organized by Expocenter and Russian Laser Association.