Axial Mode Competition in the 636.0 nm He-Cd II Hollow Cathode Metal Vapor Lasers

Wakao SASAKI; Tatehisa OHTA; Hideshi UEDA

Axial Mode Competition in the 636.0 nm He-Cd II Hollow Cathode Metal Vapor Lasers

Wakao SASAKI, Tatehisa OHTA, Hideshi UEDA

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This paper reports the measurements for the axial mode competition in the 636.0 nm He-Cd II laser at several He pressures. The beginning conditions for the actual mode competition are examined experimentally, and discussed qualitatively from the viewpoints of the broadening mechanisms of the spectral lines. As a result, the axial mode separation at the beginning point of the mode competition gives the upper laser level decay rate γ_a under the actual lasing condition at 636.0 nm Cd II line. Based on experiments, the upper and lower laser level decay rates γ_a and γ_b, and hence the γ_ab (mean value of γ_a and γ_b), are all determined along with the collision cross sections of the excited lasing state Cd atoms with buffer gas (He) atoms. The derived values of γ_a (0)49.5 MHz at the zero-pressure limit, which yields the radiative life time of the upper laser level at 3.2 ns, and the collision corss section ^σ_He1.710^-16 cm² are roughly consistent with those reported based on the theoretical calculations. The experimentally determined He pressure dependence of the γ_a is expressed by γ_a49.51^P_He(MHz), where ^P_He is the He pressure. For example, at ^P_He6 Torr, γ_a56.5 MHz, γ_b121 MHz, and then γ_ab(γ_aγ_b)/288.8 MHz.

Publication: IEICE TRANSACTIONS on transactions Vol.E68-E No.5 pp.331-336

Publication Date: 1985/05/25

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Type of Manuscript: PAPER

Category: Optical and Quantum Electronics

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Wakao SASAKI
Tatehisa OHTA
Hideshi UEDA

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Wakao SASAKI, Tatehisa OHTA, Hideshi UEDA, "Axial Mode Competition in the 636.0 nm He-Cd II Hollow Cathode Metal Vapor Lasers" in IEICE TRANSACTIONS on transactions, vol. E68-E, no. 5, pp. 331-336, May 1985, doi: .
Abstract: This paper reports the measurements for the axial mode competition in the 636.0 nm He-Cd II laser at several He pressures. The beginning conditions for the actual mode competition are examined experimentally, and discussed qualitatively from the viewpoints of the broadening mechanisms of the spectral lines. As a result, the axial mode separation at the beginning point of the mode competition gives the upper laser level decay rate γ_a under the actual lasing condition at 636.0 nm Cd II line. Based on experiments, the upper and lower laser level decay rates γ_a and γ_b, and hence the γ_ab (mean value of γ_a and γ_b), are all determined along with the collision cross sections of the excited lasing state Cd atoms with buffer gas (He) atoms. The derived values of γ_a (0)49.5 MHz at the zero-pressure limit, which yields the radiative life time of the upper laser level at 3.2 ns, and the collision corss section ^σ_He1.710^-16 cm² are roughly consistent with those reported based on the theoretical calculations. The experimentally determined He pressure dependence of the γ_a is expressed by γ_a49.51^P_He(MHz), where ^P_He is the He pressure. For example, at ^P_He6 Torr, γ_a56.5 MHz, γ_b121 MHz, and then γ_ab(γ_aγ_b)/288.8 MHz.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e68-e_5_331/_p

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@ARTICLE{e68-e_5_331,
author={Wakao SASAKI, Tatehisa OHTA, Hideshi UEDA, },
journal={IEICE TRANSACTIONS on transactions},
title={Axial Mode Competition in the 636.0 nm He-Cd II Hollow Cathode Metal Vapor Lasers},
year={1985},
volume={E68-E},
number={5},
pages={331-336},
abstract={This paper reports the measurements for the axial mode competition in the 636.0 nm He-Cd II laser at several He pressures. The beginning conditions for the actual mode competition are examined experimentally, and discussed qualitatively from the viewpoints of the broadening mechanisms of the spectral lines. As a result, the axial mode separation at the beginning point of the mode competition gives the upper laser level decay rate γ_a under the actual lasing condition at 636.0 nm Cd II line. Based on experiments, the upper and lower laser level decay rates γ_a and γ_b, and hence the γ_ab (mean value of γ_a and γ_b), are all determined along with the collision cross sections of the excited lasing state Cd atoms with buffer gas (He) atoms. The derived values of γ_a (0)49.5 MHz at the zero-pressure limit, which yields the radiative life time of the upper laser level at 3.2 ns, and the collision corss section ^σ_He1.710^-16 cm² are roughly consistent with those reported based on the theoretical calculations. The experimentally determined He pressure dependence of the γ_a is expressed by γ_a49.51^P_He(MHz), where ^P_He is the He pressure. For example, at ^P_He6 Torr, γ_a56.5 MHz, γ_b121 MHz, and then γ_ab(γ_aγ_b)/288.8 MHz.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - Axial Mode Competition in the 636.0 nm He-Cd II Hollow Cathode Metal Vapor Lasers
T2 - IEICE TRANSACTIONS on transactions
SP - 331
EP - 336
AU - Wakao SASAKI
AU - Tatehisa OHTA
AU - Hideshi UEDA
PY - 1985
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E68-E
IS - 5
JA - IEICE TRANSACTIONS on transactions
Y1 - May 1985
AB - This paper reports the measurements for the axial mode competition in the 636.0 nm He-Cd II laser at several He pressures. The beginning conditions for the actual mode competition are examined experimentally, and discussed qualitatively from the viewpoints of the broadening mechanisms of the spectral lines. As a result, the axial mode separation at the beginning point of the mode competition gives the upper laser level decay rate γ_a under the actual lasing condition at 636.0 nm Cd II line. Based on experiments, the upper and lower laser level decay rates γ_a and γ_b, and hence the γ_ab (mean value of γ_a and γ_b), are all determined along with the collision cross sections of the excited lasing state Cd atoms with buffer gas (He) atoms. The derived values of γ_a (0)49.5 MHz at the zero-pressure limit, which yields the radiative life time of the upper laser level at 3.2 ns, and the collision corss section ^σ_He1.710^-16 cm² are roughly consistent with those reported based on the theoretical calculations. The experimentally determined He pressure dependence of the γ_a is expressed by γ_a49.51^P_He(MHz), where ^P_He is the He pressure. For example, at ^P_He6 Torr, γ_a56.5 MHz, γ_b121 MHz, and then γ_ab(γ_aγ_b)/288.8 MHz.
ER -