Medium-power diode-pumped Nd:BaY<sub>2</sub>F<sub>8</sub> laser

Antonio Agnesi; Annalisa Guandalini; Andrea Lucca; Elisa Sani; Alessandra Toncelli; Mauro Tonelli; Stefano Dell’Acqua

doi:10.1364/OE.11.001149

Optics Express
Vol. 11,
Issue 10,
pp. 1149-1155
(2003)
•https://doi.org/10.1364/OE.11.001149

Medium-power diode-pumped Nd:BaY₂F₈ laser

Antonio Agnesi, Annalisa Guandalini, Andrea Lucca, Elisa Sani, Alessandra Toncelli, Mauro Tonelli, and Stefano Dell’Acqua

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Antonio Agnesi, Annalisa Guandalini, Andrea Lucca, Elisa Sani, Alessandra Toncelli, Mauro Tonelli, and Stefano Dell’Acqua, "Medium-power diode-pumped Nd:BaY₂F₈ laser," Opt. Express 11, 1149-1155 (2003)

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Abstract

We report what is to our knowledge the first Nd:BaY₂F₈ (Nd:BaYF) laser pumped with a multiwatt fiber-coupled diode array tuned at ≈804 nm. As much as 2.4 W were obtained with 6.2 W of absorbed pump power, showing efficient operation (51% slope efficiency), excellent beam quality (M ²=1.1), and weak thermal lensing. Small intracavity losses (<1%) were measured, indicating both reduced thermally induced aberrations and good optical quality of the laser crystal.

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Fig. 1. Output power as a function of the absorbed input power. The slope efficiency η for each output coupler is given. The curve with the output coupler reflectivity R=90% was obtained eventually by pumping the crystal until some optical damage occurred.

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Fig. 2. Thermal focal length values measured in Nd:BaYF, Nd:YVO₄ and numerical results.

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Fig. 3. Comparison between the intracavity passive loss values determined experimentally in Nd:BaYF, Nd:YVO₄ and the numerical results. The total loss L is calculated as the sum of a background constant loss L ₀(≈0.25% for Nd:BaYF and ≈0.1% for Nd:YVO₄) and the power-dependent diffractive contribution L_d from Eq. (7).

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Equations (7)

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P_{o} = \frac{(1 - R) P_{sat}}{2 (1 - R + L)} [g_{0} + \ln (R - L)]

W_{p} (z) = W_{p 0} + \frac{λ_{p} M_{p}^{2}}{π n_{p} W_{p 0}} ∣ z - z_{0} ∣

Δ T (r, z) = \frac{ξ P_{abs}}{4 π K_{c}} \frac{α_{eff} e^{- α_{eff} z}}{(1 - e^{- α_{eff} l})} {[(1 - \frac{r^{2}}{W_{p}^{2}}) + \ln (\frac{r_{b}^{2}}{W_{p}^{2}})] Θ (u) + \ln (\frac{r_{b}^{2}}{r^{2}}) Θ (- u)}

Δ φ (r) = φ (r) - φ (0) - γ r^{2}

φ (r) = \frac{4 π}{λ} χ \int_{0}^{l} Δ T (r, z) d z

L_{d} \approx \frac{4}{w_{g}^{2}} [\int_{0}^{r_{b}} {(Δ φ)}^{2} e^{- \frac{{2 r}^{2}}{w_{g}^{2}}} r dr - {(\int_{0}^{r_{b}} Δ φ e^{- \frac{2 r^{2}}{w_{g}^{2}}} r dr)}^{2}]

f_{th} = - \frac{2 π}{λ γ}

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Equations (7)

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