Efficient diode-array-pumped Nd:YAG and Nd:Lu:YAG lasers

Toomas H. Allik; Wayne W. Hovis; David P. Caffey; Vernon King

doi:10.1364/OL.14.000116

Optics Letters
Vol. 14,
Issue 2,
pp. 116-118
(1989)
•https://doi.org/10.1364/OL.14.000116

Efficient diode-array-pumped Nd:YAG and Nd:Lu:YAG lasers

Toomas H. Allik, Wayne W. Hovis, David P. Caffey, and Vernon King

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Toomas H. Allik, Wayne W. Hovis, David P. Caffey, and Vernon King, "Efficient diode-array-pumped Nd:YAG and Nd:Lu:YAG lasers," Opt. Lett. 14, 116-118 (1989)

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Abstract

Nd:YAG (YAG) and Nd:Lu:YAG (LYAG) are investigated as high-efficiency laser materials utilizing a diode-array side-pump geometry. We demonstrate higher laser efficiencies than previously reported for transversely pumped YAG. A YAG rod yielded an optical slope efficiency of 47.7%, while a LYAG rod yielded an optical slope efficiency of 50.3%. Increased performance of these materials is attributed to higher pump absorption and lower losses.

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Output-Coupler Reflectivity and Radius of Curvature	Nd:Lu:YAG		Nd:YAG
Output-Coupler Reflectivity and Radius of Curvature	Optical Slope Efficiency (%)	Extrapolated Threshold (mJ)	Optical Slope Efficiency (%)	Extrapolated Threshold (mJ)
0.975 (∞)	42.1	8.7	37.6	9.1
0.965 (∞)	44.8	9.4	40.6	9.9
0.961 (∞)	45.0	9.9	41.0	10.2
0.937 (∞)	44.0	15.8	40.9	15.8
0.908 (∞)	44.1	19.0	41.4	18.7
0.975 (63.5 cm)	49.6	11.3	44.6	11.6
0.950 (63.5 cm)	49.0	16.2	46.3	16.2
0.915 (75.0 cm)	48.9	22.3	47.0	21.9
0.885 (75.0 cm)	48.0	24.3	46.3	23.9

Parameter	Nd:YAG	Nd:Lu:YAG
Round-trip loss (L)	3.1 ± 0.6%	2.5 ± 0.6%
Pumping coefficient (K)	6.6 ± 0.7 ×10⁻⁴ W⁻¹	6.2 ± 0.6 ×10⁻⁴ W⁻¹
Fluorescence lifetime (τ)	232 ± 2 μsec	262 ± 2 μsec
Saturation intensity (I_s)	2.9 × 10³ W/cm²	3.0 × 10³ W/cm²
Absorption efficiency factor (η_a)	0.36 ± 0.07	0.35 ± 0.07

Output-Coupler Reflectivity and Radius of Curvature	Nd:Lu:YAG		Nd:YAG
Output-Coupler Reflectivity and Radius of Curvature	Optical Slope Efficiency (%)	Extrapolated Threshold (mJ)	Optical Slope Efficiency (%)	Extrapolated Threshold (mJ)
0.975 (∞)	42.1	8.7	37.6	9.1
0.965 (∞)	44.8	9.4	40.6	9.9
0.961 (∞)	45.0	9.9	41.0	10.2
0.937 (∞)	44.0	15.8	40.9	15.8
0.908 (∞)	44.1	19.0	41.4	18.7
0.975 (63.5 cm)	49.6	11.3	44.6	11.6
0.950 (63.5 cm)	49.0	16.2	46.3	16.2
0.915 (75.0 cm)	48.9	22.3	47.0	21.9
0.885 (75.0 cm)	48.0	24.3	46.3	23.9

Parameter	Nd:YAG	Nd:Lu:YAG
Round-trip loss (L)	3.1 ± 0.6%	2.5 ± 0.6%
Pumping coefficient (K)	6.6 ± 0.7 ×10⁻⁴ W⁻¹	6.2 ± 0.6 ×10⁻⁴ W⁻¹
Fluorescence lifetime (τ)	232 ± 2 μsec	262 ± 2 μsec
Saturation intensity (I_s)	2.9 × 10³ W/cm²	3.0 × 10³ W/cm²
Absorption efficiency factor (η_a)	0.36 ± 0.07	0.35 ± 0.07

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Optics Letters