Sum frequency generation of UV laser radiation at 266 nm in LBO crystal

D. G. Nikitin; O. A. Byalkovskiy; O. I. Vershinin; P. V. Puyu; V. A. Tyrtyshnyy

doi:10.1364/OL.41.001660

Optics Letters
Vol. 41,
Issue 7,
pp. 1660-1663
(2016)
•https://doi.org/10.1364/OL.41.001660

Sum frequency generation of UV laser radiation at 266 nm in LBO crystal

D. G. Nikitin, O. A. Byalkovskiy, O. I. Vershinin, P. V. Puyu, and V. A. Tyrtyshnyy

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D. G. Nikitin, O. A. Byalkovskiy, O. I. Vershinin, P. V. Puyu, and V. A. Tyrtyshnyy, "Sum frequency generation of UV laser radiation at 266 nm in LBO crystal," Opt. Lett. 41, 1660-1663 (2016)

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Abstract

We report experimental results of generation at 266 nm in LBO crystal by frequency mixing of the fundamental (1064 nm) and third harmonic (355 nm) of ytterbium pulsed fiber laser radiation. Deep ultraviolet (DUV) output power of 3.3 W at 266 nm was achieved with 14% IR-to-DUV conversion efficiency. UV-induced bulk degradation of LBO crystals was observed and visualized by the dark field method.

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Crystal	PM Type	PM Scheme ^a	Walk-Off Angle, mrad [11]	PM Angle	PM Temperature, °C	Dimensions, ${mm}^{3}$	Beam Waist Diameter in Center of Crystal at 1064 nm, μm
LBO SHG	I	$o_{z}^{ω} + o_{z}^{ω} \to e_{x y}^{2 ω}$	0	$θ = 90 °$ , $φ = 0 °$	148	$3 \times 3 \times 20$	75
LBO THG	II	$o_{z}^{ω} + e_{x y}^{2 ω} \to o_{z}^{3 ω}$	10	$θ = 47 °$ , $φ = 90 °$	60	$3 \times 3 \times 15$	140
LBO FHG	I	$o_{z}^{ω} + o_{z}^{3 ω} \to e_{x y}^{4 ω}$	16	$θ = 90 °$ , $φ = 61 °$	140	$3 \times 3 \times 20$	130

LBO Crystals						Lenses
SHG LBO		THG LBO		FHG LBO		L1 ( $f = 35 mm$ )		L2 ( $f = 57 mm$ )		L3 ( $f = 57 mm$ )
Input	Output	Input	Output	Input	Output	Input	Output	Input	Output	Input	Output
AR 1064/532			Uncoated			AR 1064		AR 1064/532		AR 355

Crystal	PM Type	PM Scheme ^a	Walk-Off Angle, mrad [11]	PM Angle	PM Temperature, °C	Dimensions, ${mm}^{3}$	Beam Waist Diameter in Center of Crystal at 1064 nm, μm
LBO SHG	I	$o_{z}^{ω} + o_{z}^{ω} \to e_{x y}^{2 ω}$	0	$θ = 90 °$ , $φ = 0 °$	148	$3 \times 3 \times 20$	75
LBO THG	II	$o_{z}^{ω} + e_{x y}^{2 ω} \to o_{z}^{3 ω}$	10	$θ = 47 °$ , $φ = 90 °$	60	$3 \times 3 \times 15$	140
LBO FHG	I	$o_{z}^{ω} + o_{z}^{3 ω} \to e_{x y}^{4 ω}$	16	$θ = 90 °$ , $φ = 61 °$	140	$3 \times 3 \times 20$	130

LBO Crystals						Lenses
SHG LBO		THG LBO		FHG LBO		L1 ( $f = 35 mm$ )		L2 ( $f = 57 mm$ )		L3 ( $f = 57 mm$ )
Input	Output	Input	Output	Input	Output	Input	Output	Input	Output	Input	Output
AR 1064/532			Uncoated			AR 1064		AR 1064/532		AR 355

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