Temporal behavior of air lasing by molecular nitrogen ions

Ivanov, N. G.; Zyatikov, I.A.; Losev, V. F.; Prokop'ev, V. E.

doi:10.1016/j.optcom.2019.124573

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…Signal amplification has been recently reported in air at normal pressure [32]. The pump pulse wavelength was at 950 nm and the lasing signal occurred at 428 nm.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 90%

Theory of femtosecond strong field ion excitation and subsequent lasing in N$_2^+$

Tikhonchuk¹,

Liu²,

Danylo³

et al. 2020

Preprint

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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 nm. The mechanism responsible for the lasing is highly controversial. In this article we explain the delayed emission by the presence of long-lived polarizations coupling simultaneously ground state X 2 Σ + g to states A 2 Π u and B 2 Σ + u of singly ionized nitrogen molecules N + 2 . Ionization of neutral nitrogen molecules in a strong laser field and subsequent ion excitation are described by a system of Bloch equations providing a distribution of ions in the ground and excited states A and B at the end of the laser pulse. The delayed signal amplification at the B-X transition wavelength is described by a system of Maxwell-Bloch equations with polarization coupling maintained by a weak laser post-pulse. Two regimes of signal amplification are identified: a signal of a few ps duration at low gas pressures and a short (sub-picosecond) signal at high gas pressures. The theoretical model compares favorably with experimental results.

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“…Signal amplification has been recently reported in air at normal pressure [32]. The pump pulse wavelength was at 950 nm and the lasing signal occurred at 428 nm.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 90%

Theory of femtosecond strong field ion excitation and subsequent lasing in N$_2^+$

Tikhonchuk¹,

Liu²,

Danylo³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Данное излучение было впервые обнаружено путём накачки лазерным импульсом в средней ИК области [1]. Позже оно наблюдалось при накачке импульсом на других длинах волн, включая 1.03 µm [5], 950 nm [7,8], 800 nm [2][3][4]. Было показано, что для возникновения генерации необходимо использовать внешнее дополнительное (затравочное) излучение на длине волны соответствующего перехода иона азота, в качестве которого выступаeт излучение гармоник накачки или суперконтинуума (СК).…”

Section: Introductionunclassified

“…Поскольку типичная спектральная ширина на полувысоте генерации составляет ∼ 0.28 и ∼ 0.24 nm для длин волн 427.8 и 391.4 nm, то была оценена спектрально ограниченная длительность в 0.96 и 0.93 ps соответственно [3]. Однако дальнейшие эксперименты по измерению длительности кросс-корреляционным методом и стрик-камерой с разрешением 0.74 [7]…”

Section: Introductionunclassified

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Безрезонаторная Генерация На Ионах Молекулярного Азота В Воздушной Лазерной Плазме

Зятиков¹,

Лосев²

2022

Оптика И Спектроскопия

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In this work, the results of investigation of temporal and spectral lasing characteristics on the first negative transition В – X of molecular nitrogen ions in air laser plasma are presented. Pumping was performed by the emission with central wavelength of 950 nm, 60 fs duration, and energy of 10 mJ. The active medium parameters are analyzed and possible mechanism for the formation of picosecond duration of radiation pulse is discussed.

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Emission of Nitrogen Molecules at Tight Focusing of Femtosecond Laser Pulses in Air

et al. 2022

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Temporal behavior of air lasing by molecular nitrogen ions

Cited by 10 publications

References 13 publications

Theory of femtosecond strong field ion excitation and subsequent lasing in N$_2^+$

Theory of femtosecond strong field ion excitation and subsequent lasing in N$_2^+$

Безрезонаторная Генерация На Ионах Молекулярного Азота В Воздушной Лазерной Плазме

Emission of Nitrogen Molecules at Tight Focusing of Femtosecond Laser Pulses in Air

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