Determination of the Velocity of Light Using the Laser as a Source*

Douglas Sinclair; M. Parker Givens

doi:10.1364/JOSA.54.000795

Journal of the Optical Society of America
Vol. 54,
Issue 6,
pp. 795-797
(1964)
•https://doi.org/10.1364/JOSA.54.000795

Determination of the Velocity of Light Using the Laser as a Source

Douglas Sinclair and M. Parker Givens

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Douglas Sinclair and M. Parker Givens, "Determination of the Velocity of Light Using the Laser as a Source*," J. Opt. Soc. Am. 54, 795-797 (1964)

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Abstract

A measurement has been made of the velocity of light using the laser as a light source. The beating between the modes of the laser provided intensity fluctuations which made it unnecessary to modulate the beam artificially.

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Run	A	B	C	D
Run	1st min (cm)	2nd min (cm)	3rd min (cm)	4th min (cm)
1	37.7	86.1	137.2	186.6
2	36.8	86.05	136.8	186.6
3	37.3	85.7	136.2	186.1
4	37.4	85.6	137.7	186.6
5	36.5	86.0	137.1	186.6
6	37.4	86.2	137.4	186.7
7	37.4	85.8	136.2	185.7
8	36.5	86.7	137.1	186.3
9	37.1	86.2	137.3	186.3
10	37.1	85.9	137.3	186.8
Average	37.12	86.03	137.03	186.43
Differences: B−A = 48.91 cm C−B = 51.00 cm D−C = 49.40 cm C−A = 99.91 cm D−B = 100.40 cm
Indicated wavelength, λ, ⋯ 97.82, 99.91, 102.00, 100.40, 98.80 cm
Average wavelength λ of the beat frequency 99.78 cm.
Velocity of light c		= 99.78 cm×3.00×10⁸∼/sec
		= 2.993×10¹⁰ cm/sec

Run	A	B	C	D
Run	1st min (cm)	2nd min (cm)	3rd min (cm)	4th min (cm)
1	36.6	86.4	137.0	186.6
2	36.9	86.3	136.9	185.9
3	36.75	86.9	137.2	186.0
4	36.95	86.0	136.9	185.7
5	36.7	86.7	136.7	186.2
6	36.7	86.2	137.1	186.1
7	36.6	86.2	137.0	186.3
Averages	36.74	86.39	136.97	186.11
Differences: B−A = 49.65 cm C−B = 50.58 cm D−C = 49.14 cm C−A = 100.23 cm D−B = 99.72 cm
Indicated wavelength, λ, ⋯ 99.30, 100.23, 101.16, 99.72, 98.28 cm
Average wavelength, λ of the beat frequency 99.74 cm.
Velocity of light c		= 99.74 cm×3.00×10⁸∼/sec
		= 2.992×10¹⁰ cm/sec.

Run	A	B	C	D
Run	1st min (cm)	2nd min (cm)	3rd min (cm)	4th min (cm)
1	37.7	86.1	137.2	186.6
2	36.8	86.05	136.8	186.6
3	37.3	85.7	136.2	186.1
4	37.4	85.6	137.7	186.6
5	36.5	86.0	137.1	186.6
6	37.4	86.2	137.4	186.7
7	37.4	85.8	136.2	185.7
8	36.5	86.7	137.1	186.3
9	37.1	86.2	137.3	186.3
10	37.1	85.9	137.3	186.8
Average	37.12	86.03	137.03	186.43
Differences: B−A = 48.91 cm C−B = 51.00 cm D−C = 49.40 cm C−A = 99.91 cm D−B = 100.40 cm
Indicated wavelength, λ, ⋯ 97.82, 99.91, 102.00, 100.40, 98.80 cm
Average wavelength λ of the beat frequency 99.78 cm.
Velocity of light c		= 99.78 cm×3.00×10⁸∼/sec
		= 2.993×10¹⁰ cm/sec

Run	A	B	C	D
Run	1st min (cm)	2nd min (cm)	3rd min (cm)	4th min (cm)
1	36.6	86.4	137.0	186.6
2	36.9	86.3	136.9	185.9
3	36.75	86.9	137.2	186.0
4	36.95	86.0	136.9	185.7
5	36.7	86.7	136.7	186.2
6	36.7	86.2	137.1	186.1
7	36.6	86.2	137.0	186.3
Averages	36.74	86.39	136.97	186.11
Differences: B−A = 49.65 cm C−B = 50.58 cm D−C = 49.14 cm C−A = 100.23 cm D−B = 99.72 cm
Indicated wavelength, λ, ⋯ 99.30, 100.23, 101.16, 99.72, 98.28 cm
Average wavelength, λ of the beat frequency 99.74 cm.
Velocity of light c		= 99.74 cm×3.00×10⁸∼/sec
		= 2.992×10¹⁰ cm/sec.

Abstract

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Equations (4)

Journal of the Optical Society of America