Ionizing waves of potential gradient in a transversely excited N<sub>2</sub> laser cavity

C. Lal; S. N. Thakur

doi:10.1364/AO.21.002317

Applied Optics
Vol. 21,
Issue 13,
pp. 2317-2322
(1982)
•https://doi.org/10.1364/AO.21.002317

Ionizing waves of potential gradient in a transversely excited N₂ laser cavity

C. Lal and S. N. Thakur

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C. Lal and S. N. Thakur, "Ionizing waves of potential gradient in a transversely excited N₂ laser cavity," Appl. Opt. 21, 2317-2322 (1982)

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Abstract

The positions of maximum intensity in the beam cross section of transversely excited N₂ lasers have been measured at different gas pressures for three types of laser channel. The results show that there is a nonuniformity in the population inversion in the interelectrode region, which is discussed in terms of ionizing waves of potential gradient.

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Laser cavity	Pressure (in Torr)	d (in mm) for direct biasing	d (in mm) for reverse biasing
Laser 1	40	8.7	8.2
	60	9.4	8.3
	80	10.4	9.3
Laser 2	40	5.0	5.1
	60	5.3	5.2
	80	5.8	6.1
	100	6.3	6.2
Laser 3	50	4.3 and 5.7	5.6
	70	4.3 and 6.4	6.4
	90	4.3 and 7.1	7.0

Laser cavity	Applied voltage V(kV)	E = V/x (V/cm)	p(Torr)	E/p (V/cm Torr)	(ions/cm electron)	υ (cm/sec)	d (mm)
Laser 1	13	8666.67	40	216.7	122.80	17.8 × 10⁷	2.7
			60	144.4	87.06	14.5 × 10⁷	4.7
			80	108.3	58.32	12.6 × 10⁷	7.9
Laser 2	13	13000.00	40	325.0	176.00	21.8 × 10⁷	1.5
			60	216.7	184.20	17.8 × 10⁷	1.8
			80	162.5	146.00	15.4 × 10⁷	2.6
			100	130.00	113.50	13.7 × 10⁷	3.8
Laser 3	13	13000.00	50	260.00	187.50	19.5 × 10⁷	1.6
			70	185.70	170.52	16.4 × 10⁷	2.1
			90	144.4	130.59	14.5 × 10⁷	3.1

Laser cavity	Pressure (in Torr)	d (in mm) for direct biasing	d (in mm) for reverse biasing
Laser 1	40	8.7	8.2
	60	9.4	8.3
	80	10.4	9.3
Laser 2	40	5.0	5.1
	60	5.3	5.2
	80	5.8	6.1
	100	6.3	6.2
Laser 3	50	4.3 and 5.7	5.6
	70	4.3 and 6.4	6.4
	90	4.3 and 7.1	7.0

Laser cavity	Applied voltage V(kV)	E = V/x (V/cm)	p(Torr)	E/p (V/cm Torr)	(ions/cm electron)	υ (cm/sec)	d (mm)
Laser 1	13	8666.67	40	216.7	122.80	17.8 × 10⁷	2.7
			60	144.4	87.06	14.5 × 10⁷	4.7
			80	108.3	58.32	12.6 × 10⁷	7.9
Laser 2	13	13000.00	40	325.0	176.00	21.8 × 10⁷	1.5
			60	216.7	184.20	17.8 × 10⁷	1.8
			80	162.5	146.00	15.4 × 10⁷	2.6
			100	130.00	113.50	13.7 × 10⁷	3.8
Laser 3	13	13000.00	50	260.00	187.50	19.5 × 10⁷	1.6
			70	185.70	170.52	16.4 × 10⁷	2.1
			90	144.4	130.59	14.5 × 10⁷	3.1

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Applied Optics