Interferometric Investigation of Modes in Optical Gas Masers

Thomas G. Polanyi; William R. Watson

doi:10.1364/JOSA.54.000449

Journal of the Optical Society of America
Vol. 54,
Issue 4,
pp. 449-454
(1964)
•https://doi.org/10.1364/JOSA.54.000449

Interferometric Investigation of Modes in Optical Gas Masers

Thomas G. Polanyi and William R. Watson

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Thomas G. Polanyi and William R. Watson, "Interferometric Investigation of Modes in Optical Gas Masers," J. Opt. Soc. Am. 54, 449-454 (1964)

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Abstract

The number and relative power of simultaneously oscillating modes in 6328-Å He–Ne optical gas masers (lasers) were measured by means of a technique utilizing Fabry–Perot interferometers. In one case 28 dominant modes spanning a frequency range of 1080 Mc/sec out of the 1500 Mc/sec half-width of the 6328-Å Ne line were found. The relative amplitudes of the modes can be fitted generally to a Gaussian-shaped curve. The technique, which utilizes a scanning Fabry–Perot, is described and discussed.

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	Chart distance, x (in.)
Spectrum (s)	Modes a	b	c	d
−6	−0.98	−0.52	−0.05	0.38
−5	1.08	1.54	2.00	2.46
−4	3.20	3.70	4.18	4.66
−3	5.38	5.82	6.31	6.76
−2	7.48	7.97	8.45	8.89
−1	9.60	10.06	10.54	11.03
0	11.81	12.27	12.78	13.19
1	13.92	14.41	14.89	15.36
2	16.06	16.48	16.96	17.38
3	18.10	18.58	19.07	19.53
4	20.19	20.63	21.10	21.56
5	22.32	22.79	23.27	23.74
6	24.45	24.92	25.37	25.94
$\frac{Σ s x}{Σ s^{2}} = \frac{\partial x}{\partial s} in .$	2.123	2.122	2.122	2.126
$\frac{Σ x}{13} = \bar{x} in .$	11.739	12.204	12.682	13.145
Δ $\bar{x}$ in.		0.465	0.478	0.463
$Δ f = \frac{15 000}{h} \frac{Δ \bar{x}}{\partial x / \partial s} measured (Mc / sec)$		243	249	242
$Δ f = \frac{15 000}{L} expected (Mc / sec)$		246	246	246
Deviation from expected (Mc/sec)		−3	+3	−4

Mirror spacing cm	Mirror radius cm	Tube diam mm	Modes		Range Mc/sec
Mirror spacing cm	Mirror radius cm	Tube diam mm	cps	No.	Range Mc/sec
100	(plane)	7	c/2L	6	750
60	(plane)	3	c/2L	5	1000
190	192	7	c/4L	28	1080
100	100	7	c/4L	10	675
60	60	3	c/2L	4	744
60	60	3	c/2L+c/4L	8	1000
57	100	3	c/2L	5	1044
60	100	5	c/4L	6	650

	Chart distance, x (in.)
Spectrum (s)	Modes a	b	c	d
−6	−0.98	−0.52	−0.05	0.38
−5	1.08	1.54	2.00	2.46
−4	3.20	3.70	4.18	4.66
−3	5.38	5.82	6.31	6.76
−2	7.48	7.97	8.45	8.89
−1	9.60	10.06	10.54	11.03
0	11.81	12.27	12.78	13.19
1	13.92	14.41	14.89	15.36
2	16.06	16.48	16.96	17.38
3	18.10	18.58	19.07	19.53
4	20.19	20.63	21.10	21.56
5	22.32	22.79	23.27	23.74
6	24.45	24.92	25.37	25.94
$\frac{Σ s x}{Σ s^{2}} = \frac{\partial x}{\partial s} in .$	2.123	2.122	2.122	2.126
$\frac{Σ x}{13} = \bar{x} in .$	11.739	12.204	12.682	13.145
Δ $\bar{x}$ in.		0.465	0.478	0.463
$Δ f = \frac{15 000}{h} \frac{Δ \bar{x}}{\partial x / \partial s} measured (Mc / sec)$		243	249	242
$Δ f = \frac{15 000}{L} expected (Mc / sec)$		246	246	246
Deviation from expected (Mc/sec)		−3	+3	−4

Mirror spacing cm	Mirror radius cm	Tube diam mm	Modes		Range Mc/sec
Mirror spacing cm	Mirror radius cm	Tube diam mm	cps	No.	Range Mc/sec
100	(plane)	7	c/2L	6	750
60	(plane)	3	c/2L	5	1000
190	192	7	c/4L	28	1080
100	100	7	c/4L	10	675
60	60	3	c/2L	4	744
60	60	3	c/2L+c/4L	8	1000
57	100	3	c/2L	5	1044
60	100	5	c/4L	6	650

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Journal of the Optical Society of America