Evaluation of Specially Grown Ruby Laser Rods

E. W. Sucov

doi:10.1364/AO.4.001107

Applied Optics
Vol. 4,
Issue 9,
pp. 1107-1112
(1965)
•https://doi.org/10.1364/AO.4.001107

Evaluation of Specially Grown Ruby Laser Rods

E. W. Sucov

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E. W. Sucov, "Evaluation of Specially Grown Ruby Laser Rods," Appl. Opt. 4, 1107-1112 (1965)

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Abstract

Twelve ruby rods incorporating two kinds of controllable gross inhomogeneities (banding and lineage) were studied. Optical evaluation by means of interferographs and low-angle scattering measurements were compared with actual performance measurements. It is concluded that not enough information is available to predict the performance of a ruby laser rod from its manner of growth or from measures of passive optical homogeneity. Time-dependent measurements are suggested as being more useful, and a hypothesis to explain the differences in performance between various rods is proposed.

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Rod	Inhomogeneity	Estimate of quality (1 = best)

		Interferograph	Low-angle scatter	Large-angle scatter
1783–30–1	Low lineage
1783–30–2	Low lineage
1783–16–1	High lineage
1783–16–2	High lineage	4	5(58)^a	2
1765–76	High lineage
1830–12	Low bands
12–9–63	Low bands	1	6(71)	6
1783–38	High bands
1830–42	High bands	5	2(29)	1
1782–58	High bands	6	4(43)	5
1–15–64	Low lensing	3	1(26)	3
2–3–64	Low lensing	2	3(37)	4

Rod	Inhomogeneity	Threshold(J)	(At 600 J energy input)

			Energy out (J)	θ (mrad)	Radiance (10³ J/Sr)
Dielectric coated rods (99–95%)
1783–30–1^a	Low lineage	220	1.16	2.3	208
1783–30–2	Low lineage	200	0.52	3.4	45
1783–16–1	High lineage	210	0.24	—	—
1765–76	High lineage	275	0.18	1.7	62
1830–12	Low bands	240	0.49	6.9	10.4
1783–38	High bands	200	0.42	6.9	8.9
Uncoated rods: external mirrors (99–85%) 43 cm apart
12–9–63	Low bands	216	0.81	2.3	145
1830–42	High bands	294	0.31	1.7	107
1782–58^a	High bands	216	0.72	1.2	514
1783–16–2^a	High lineage	294	0.62	1.4	310
2–3–64	Low lensing	216	0.93	2.3	166
1–15–64°^a	Low lensing	188	1.50	2.3	270

Rod	Inhomogeneity	Estimate of quality (1 = best)

		Interferograph	Low-angle scatter	Large-angle scatter
1783–30–1	Low lineage
1783–30–2	Low lineage
1783–16–1	High lineage
1783–16–2	High lineage	4	5(58)^a	2
1765–76	High lineage
1830–12	Low bands
12–9–63	Low bands	1	6(71)	6
1783–38	High bands
1830–42	High bands	5	2(29)	1
1782–58	High bands	6	4(43)	5
1–15–64	Low lensing	3	1(26)	3
2–3–64	Low lensing	2	3(37)	4

Rod	Inhomogeneity	Threshold(J)	(At 600 J energy input)

			Energy out (J)	θ (mrad)	Radiance (10³ J/Sr)
Dielectric coated rods (99–95%)
1783–30–1^a	Low lineage	220	1.16	2.3	208
1783–30–2	Low lineage	200	0.52	3.4	45
1783–16–1	High lineage	210	0.24	—	—
1765–76	High lineage	275	0.18	1.7	62
1830–12	Low bands	240	0.49	6.9	10.4
1783–38	High bands	200	0.42	6.9	8.9
Uncoated rods: external mirrors (99–85%) 43 cm apart
12–9–63	Low bands	216	0.81	2.3	145
1830–42	High bands	294	0.31	1.7	107
1782–58^a	High bands	216	0.72	1.2	514
1783–16–2^a	High lineage	294	0.62	1.4	310
2–3–64	Low lensing	216	0.93	2.3	166
1–15–64°^a	Low lensing	188	1.50	2.3	270

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Applied Optics