Observation of transverse modes in a microchip laser with combined gain and index guiding

N. J. van Druten; S. S. R. Oemrawsingh; Y. Lien; C. Serrat; M. P. van Exter; J. P. Woerdman

doi:10.1364/JOSAB.18.001793

Journal of the Optical Society of America B
Vol. 18,
Issue 12,
pp. 1793-1804
(2001)
•https://doi.org/10.1364/JOSAB.18.001793

Observation of transverse modes in a microchip laser with combined gain and index guiding

N. J. van Druten, S. S. R. Oemrawsingh, Y. Lien, C. Serrat, M. P. van Exter, and J. P. Woerdman

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N. J. van Druten, S. S. R. Oemrawsingh, Y. Lien, C. Serrat, M. P. van Exter, and J. P. Woerdman, "Observation of transverse modes in a microchip laser with combined gain and index guiding," J. Opt. Soc. Am. B 18, 1793-1804 (2001)

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Abstract

The transverse-mode profiles for a plano–concave $Nd : {YVO}_{4}$ microchip laser near threshold are examined, both experimentally and theoretically, and in both the near and the far field. We study in particular the transition from dominant quadratic index guiding to dominant gain guiding. The modal profiles change dramatically in this transition, and the agreement between experiment and the theoretical model is excellent.

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Variable	Description	Value
$L_{1}$	Crystal thickness	0.21(3) mm
$n_{1}$	Crystal refractive index	2.1652
$L_{2}$	Size of the air gap	0.10(3) mm
$n_{2}$	Refractive index of air gap	1
$R_{c}$	Mirror radius of curvature	200 mm
$w_{g}$	Gain (=pump) waist size	14(1) µm
$λ_{at}$	Laser output wavelength	1064 nm
$γ_{at} / π$	FWHM of the gain	207 GHz
L	Effective length	0.3 mm
$n_{0}$	Effective refractive index	1.7
$w_{0}$	Waist size of parabolic index guide	46 µm

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Journal of the Optical Society of America B