Avesta TeMa掺镱固体飞秒激光器

Avesta 固体光纤激光器相关论文

We have achieved experimentally a generation of white-light few-cycle femtosecond laser pulses, using a neon-filled hollow-core fibre. The pulses observed by us are as short as 6.22 fs at the repetition rate of 1 kHz, when the input is characterized by the parameters 2.5 mJ and 33 fs. Pulse compression has been achieved using a supercontinuum produced in a static neon-filled hollow fibre, while a pair of chirped mirrors have compensated the dispersion. Our technique allows for directly tuning the pulse duration via changing the gas pressure, while maintaining near-transform-limited pulses with constant output energies and thus reducing the complications introduced by the chirped pulses. Using the measurements of the optical transmission of the fibre as a function of the gas pressure, we have testified a high enough throughput exceeding 60%. This demonstrates the successful compression that yields few-cycle femtosecond-long pulses, with a wide spectral bandwidth.

Avesta 飞秒激光器相关论文

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 show to be less than 1 fs. A simple qualitative model addressing the synchronisation mechanism utilising the сross-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.

Avesta 飞秒激光器相关论文

A femtosecond Raman laser utilising compressed hydrogen is experimentally investigated under pumping by radiation from a 1-kHz-repetition-rate Ti : sapphire laser. In the regime of double-pulse pumping, the conditions are determined, which correspond to the minimal energy dispersion of Stokes pulses. The optical scheme is realised, which is capable of ensuring the long-term stability of the average power of the first Stokes component with a variation of less than 2 %. The Stokes pulses are produced with a pulse duration of 60 fs and energy of 0.26 mJ at a conversion efficiency of 14 %.

脉冲飞秒激光器相关论文

Laser systems with Yb3+ ion doped active elements (yt terbium lasers) are in strong demand owing to their high efficiency and energy capabilities.1,2 Along with high-power cw ytterbium lasers, the pulsed laser systems are quite widespread, with femtosecond output pulses in particular. A powerful source of femtosecond visible light pulses with a central wavelength of 515 nm can be created on the basis of ytterbium laser radiation with wavelength of 1030 nm con verted to second harmonic. Such light pulses with the duration shorter than 20–30 fs and having energy of ∼(10–100)μJ may be widely used. For example, in biology, laser micromachining, parametric laser pumping, and so on. However,the duration of the output pulses of ytterbium laser systems which are designed on the master oscillator-amplifier scheme and operate in the (10−2–1) mJ energy range is longer than 200 fs.3,4 Therefore, nonlinear techniques are used to compress laser pulses down to 30 fs.