Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses.

@article{Liu2013SelfseededLI,
  title={Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses.},
  author={Yi Liu and Yohann Brelet and Guillaume Point and A. Houard and Andr{\'e} Mysyrowicz},
  journal={Optics express},
  year={2013},
  volume={21 19},
  pages={
          22791-8
        }
}
We report on the lasing in air and pure nitrogen gas pumped by a single 800 nm femtosecond laser pulse. Depending on gas pressure, incident laser power and beam convergence, different lasing lines are observed in the forward direction with rapid change of their relative intensities. The lines are attributed to transitions between vibrational and rotational levels of the first negative band of the singly charged nitrogen molecule-ion. We show that self-seeding plays an important role in the… 

Time-resolved study of laser emission in nitrogen gas pumped by two near IR femtosecond laser pulses.

The time profile of a lasing signal at 391.4 nm emitted by a weakly ionized gas of nitrogen molecules at low pressure is measured under double excitation with intense femtosecond laser pulses at 800 nm, terminating the conditions for lasing in a V-scheme without population inversion.

Backward lasing of singly ionized nitrogen ions pumped by femtosecond laser pulses

We report on the observation of backward lasing at 391.4 nm of nitrogen ions pumped by linearly polarized intense femtosecond pulses at 800 nm. The strongly enhanced spectral intensity at 391.4 nm,

Self-seeded forward lasing action from a femtosecond Ti:sapphire laser filament in air

428 nm forward lasing action was observed from a femtosecond laser filament in air created by Ti:sapphire laser pulses. The 800 nm femtosecond laser filament not only provides a source for population

Active medium parameters of molecular nitrogen ions in air laser plasma

In this work, self-seeded lasing pulse duration of the В2Σ+u – X2Σ+g transition of molecular nitrogen ion in air laser plasma at different pump pulse focusing conditions was investigated. Pumping was

Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses.

A distinct dependence of the backward UV spectrum on pump laser polarization and intensity is observed, pointing to the occurrence of backward amplified spontaneous emission inside filaments.

Theory of femtosecond strong field ion excitation and subsequent lasing in N2+

Delayed cavity-free forward lasing at the wavelengths of 391 and 428 nm was observed in recent experiments in air or pure nitrogen pumped with an intense femtosecond laser pulse at wavelength of 800

Lasing of N2+ induced by filamentation in air as a probe for femtosecond coherent anti-Stokes Raman scattering.

It is shown that the lasing pulse acts as a probe for the excited levels by detecting the corresponding anti-Stokes Raman spectroscopy signals, which may be applied to remote sensing applications, as the temporal and spatial alignment of the probe beam and the filament is intrinsically provided.

Gain dynamics of a free-space nitrogen laser pumped by circularly polarized femtosecond laser pulses.

By measuring the intensities of 337-nm signal from nitrogen gas mixed with different concentrations of oxygen gas, it is found that oxygen molecules have a significant quenching effect on the nitrogen laser signal.

Quantum erasing of laser emission in N2.

Cavity-free lasing of N2+ induced by a femtosecond laser pulse at 800 nm is nearly totally suppressed by a delayed twin control pulse. We explain this surprising effect within the V-scheme of lasing

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428 nm forward lasing action was observed from a femtosecond laser filament in air created by Ti:sapphire laser pulses. The 800 nm femtosecond laser filament not only provides a source for population

Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses

We demonstrate multiwavelength amplified harmonic emissions in carbon dioxide gas driven by intense mid-infrared femtosecond laser pulses. The simultaneous amplified emissions at 315, 326, 337 and

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Abstract.Second-harmonic generation (SHG) in atmospheric-pressure air is experimentally studied using single focused linear-polarized Ti:sapphire intense femtosecond laser pulses at 810 nm. The

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We report on the generation of remote self-seeding laser amplification by using only one 800 nm Ti:sapphire femtosecond laser pulse. The laser pulse (∼40 fs) is first used to generate a filament

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Abstract.The backscattered fluorescence of nitrogen from filaments generated by intense ultra-fast Ti:sapphire laser pulses propagating in air is studied. The backscattered fluorescence from N2

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It is demonstrated that high gain can be achieved in the near-infrared region by pumping with a focused ultraviolet laser and low-divergence backward air lasing provides possibilities for remote detection.

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We experimentally demonstrate the generation of narrow-bandwidth emissions with excellent coherent properties at ∼391 and ∼428 nm from N2+ (B2Σu+ (v′ = 0) → X2Σg+ (v = 0, 1)) inside a femtosecond

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We report on experimental results in adaptive control over UV fluorescence from a femtosecond filament created in nitrogen. We demonstrate that an optimized sequence of femtosecond pulses can