Radiative-collision laser amplifier in helium–nitrogen

L. W. Downes; S. D. Marcum; R. A. Tilton; W. E. Wells

doi:10.1364/OL.7.000022

Optics Letters
Vol. 7,
Issue 1,
pp. 22-24
(1982)
•https://doi.org/10.1364/OL.7.000022

Radiative-collision laser amplifier in helium–nitrogen

L. W. Downes, S. D. Marcum, R. A. Tilton, and W. E. Wells

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L. W. Downes, S. D. Marcum, R. A. Tilton, and W. E. Wells, "Radiative-collision laser amplifier in helium–nitrogen," Opt. Lett. 7, 22-24 (1982)

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Abstract

Through the use of radiative collisions, sometimes called photon-induced collisions, and the autoionizing properties of N₂* (X, υ), a system using He–N₂ is presented as a high-efficiency (~15%) ultraviolet laser amplifier when an intense (>1 MW/cm²) photon field, tuned to the transition of interest, is directed into the system. The model is described using rate-equation analysis, and calculations are presented to describe this system.

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Rate Coefficient	Value Used	Reference
β	1.8 × 10⁻⁹ cm³/sec	9
k₁	1.2 × 10⁻⁹ cm³/sec	10
k₂	67.0 Torr⁻²/sec	11, 12
α	4.5 × 10⁻²⁰ (T_e/T₀)⁻⁴n_e + 5.0 × 10⁻²⁷(T_e/T₀)⁻¹n₀ cm³/sec	12
k₃₀	1.1 × 10⁻⁹ cm³/sec	13
k₃₁	1.6 × 10⁻²⁹ cm⁶/sec	13
S_m	S/0.56	14
k₄₀	6.9 × 10⁻¹¹ cm³/sec	15
k₄₁	2.9 × 10⁻³⁰ cm⁶/sec	15
k₅	7.0 × 10⁻¹¹(T_e)^1/2 cm³/sec	16
β₂	0.3 Torr⁻²/sec	17
A′	$8 π h ν^{3} σ^{'} \bar{υ} / ρ c^{2}$	Einstein Coefficient
$\bar{υ}$	2.5 × 10⁵ cm/sec	Thermal velocity
$α_{N_{2}}$	2.2 × 10⁻⁷ cm³/sec	18

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Optics Letters