Development of resonator analysis applied in hybrid slab laser with consideration of optical gain and thermal lens effect

Xingkun Ma; Lei Huang; Mali Gong; Qiang Liu; Haitao Zhang; Ping Yan

doi:10.1364/AO.52.004858

Applied Optics
Vol. 52,
Issue 20,
pp. 4858-4863
(2013)
•https://doi.org/10.1364/AO.52.004858

Development of resonator analysis applied in hybrid slab laser with consideration of optical gain and thermal lens effect

Xingkun Ma, Lei Huang, Mali Gong, Qiang Liu, Haitao Zhang, and Ping Yan

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Xingkun Ma, Lei Huang, Mali Gong, Qiang Liu, Haitao Zhang, and Ping Yan, "Development of resonator analysis applied in hybrid slab laser with consideration of optical gain and thermal lens effect," Appl. Opt. 52, 4858-4863 (2013)

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Abstract

By introducing the rate equations and light intensity propagating equations into the fast Fourier transform-based calculation, the optical gain served as the connection between the light field and light intensity, its influence over mode pattern was studied. Thermal lens effect was also investigated by means of finite element analysis. The analysis was applied to a slab laser with a hybrid cavity. A similar experimental study was also carried out in the laboratory. ${TEM}_{00}$ mode with sidelobes along the unstable direction was observed both in the calculation and experiment. As predicted in the analysis, the homogeneity of the pump light improved the beam quality. Numerical and experimental results of pump threshold and slope efficiency were also presented.

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Pump (Dilas GmbH)	LD bar (at 808 nm)	$P = 0 - 50 W$
Pump (Dilas GmbH)	Divergence angle	Fast-axis (collimated) 8 mrad slow-axis (uncollimated) 8°
	Pump distance	$D = 7 - 20 mm$
Crystal	Material	$Nd : {YVO}_{4}$ (0.5 at. %)
	Dimensions	$10 m m \times 7 m m \times 1.5 m m$
	Absorption coefficient	$α_{a} = 3.0 {cm}^{- 1} E_{∥ a}$
	Intrinsic loss	$ε_{loss} = 0.02 {cm}^{- 1}$
Cavity	Radius of $M_{1}$	$R_{1} = 500 mm$
	Radius of $M_{2}$	$R_{2} = 350 mm$
	Cavity length	$L = 75 mm$

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Applied Optics