Passively Q-switched Pr:YLF laser with a Co2+:MgAl2O4 saturable absorber

Maxim Demesh; Daniel-Timo Marzahl; Anatol Yasukevich; Viktor Kisel; Günter Huber; Nikolay Kuleshov; Christian Kränkel

doi:10.1364/OL.42.004687

Optics Letters
Vol. 42,
Issue 22,
pp. 4687-4690
(2017)
•https://doi.org/10.1364/OL.42.004687

Passively Q-switched Pr:YLF laser with a Co²⁺:MgAl₂O₄ saturable absorber

Maxim Demesh, Daniel-Timo Marzahl, Anatol Yasukevich, Viktor Kisel, Günter Huber, Nikolay Kuleshov, and Christian Kränkel

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Maxim Demesh, Daniel-Timo Marzahl, Anatol Yasukevich, Viktor Kisel, Günter Huber, Nikolay Kuleshov, and Christian Kränkel, "Passively Q-switched Pr:YLF laser with a Co²⁺:MgAl₂O₄ saturable absorber," Opt. Lett. 42, 4687-4690 (2017)

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Abstract

We report on a $2 ω$ -OPSL-pumped passively $Q$ -switched $\Pr^{3 +} : {LiYF}_{4}$ laser operating at the wavelengths of 523, 607, and 640 nm. For this, we utilized a ${Co}^{2 +}$ -doped ${MgAl}_{2} O_{4}$ (MALO) crystal as a saturable absorber in the visible range for the first time, to the best of our knowledge. In the green spectral region, the pulse duration was 210 ns with a pulse energy of 3.6 μJ and a repetition rate of 125 kHz. The minimum pulse duration of 87 ns at the highest pulse energy of 8.6 μJ was obtained at a repetition rate of 110 kHz at 607 nm. The highest $Q$ -switched average laser power of 1.4 W was obtained at an absorbed continuous-wave pump power of 3.3 W with a slope efficiency of 47% at 640 nm. Absorption saturation measurements with Co:MALO were performed, and ground and excited state absorption cross sections in the visible spectral range were determined.

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$λ_{em}$ (nm)		523	607	640
AM [2]	$σ_{em} (10^{- 20} {cm}^{2})$	2.6	13.6	21.8
AM [2]	$τ ({{}^{3}P}_{j})$ (μs)	40
SA	$σ_{GSA} (10^{- 19} {cm}^{2})$	$2.7 \pm 0.1$	$8.8 \pm 1$	$7.8 \pm 1$
	$σ_{ESA} (10^{- 19} {cm}^{2})$	$1.7 \pm 0.1$	$2.6 \pm 0.4$	$3.2 \pm 0.4$
	$N (10^{18} {cm}^{- 3})$	$2.4 \pm {0.3}^{(sample a)}$
	$N (10^{18} {cm}^{- 3})$	$0.6 \pm {0.15}^{(sample b)}$
	$τ ({}^{4}{T_{1}} ({}^{4}P))$ (ns)	150 [13]
	$F_{sat} (J / {cm}^{2})$ ^a	1.4	0.37	0.4
	$T_{o} {(%)}^{(sample a)}$	79.6	49.2	52.3
	$T_{sat} {(%)}^{(sample a)}$	87	80.1	77.9
	$T_{o} {(%)}^{(sample b)}$	99.4	97.4	97.9
	$T_{sat} {(%)}^{(sample b)}$	99.6	99.4	99.2

$λ_{em}$ (nm)	$T_{oc}$ (%)	$P_{ave}$ (W)	$η$ (%)	$τ_{p}$ (ns)	$f$ (kHz)	$E_{p}$ (μJ)	$P_{peak}$ (W)
523	1.5	0.43	17^a	205	125	3.5	16.6
607	6	0.64	26	130	100	5.9	45
607	14	0.94	40^a	87	110	8.6	99
640	2	1.16	37	120	210	4.8	40.3
640	6	1.4	47^a	103	172	8.1	79

$λ_{em}$ (nm)		523	607	640
AM [2]	$σ_{em} (10^{- 20} {cm}^{2})$	2.6	13.6	21.8
AM [2]	$τ ({{}^{3}P}_{j})$ (μs)	40
SA	$σ_{GSA} (10^{- 19} {cm}^{2})$	$2.7 \pm 0.1$	$8.8 \pm 1$	$7.8 \pm 1$
	$σ_{ESA} (10^{- 19} {cm}^{2})$	$1.7 \pm 0.1$	$2.6 \pm 0.4$	$3.2 \pm 0.4$
	$N (10^{18} {cm}^{- 3})$	$2.4 \pm {0.3}^{(sample a)}$
	$N (10^{18} {cm}^{- 3})$	$0.6 \pm {0.15}^{(sample b)}$
	$τ ({}^{4}{T_{1}} ({}^{4}P))$ (ns)	150 [13]
	$F_{sat} (J / {cm}^{2})$ ^a	1.4	0.37	0.4
	$T_{o} {(%)}^{(sample a)}$	79.6	49.2	52.3
	$T_{sat} {(%)}^{(sample a)}$	87	80.1	77.9
	$T_{o} {(%)}^{(sample b)}$	99.4	97.4	97.9
	$T_{sat} {(%)}^{(sample b)}$	99.6	99.4	99.2

$λ_{em}$ (nm)	$T_{oc}$ (%)	$P_{ave}$ (W)	$η$ (%)	$τ_{p}$ (ns)	$f$ (kHz)	$E_{p}$ (μJ)	$P_{peak}$ (W)
523	1.5	0.43	17^a	205	125	3.5	16.6
607	6	0.64	26	130	100	5.9	45
607	14	0.94	40^a	87	110	8.6	99
640	2	1.16	37	120	210	4.8	40.3
640	6	1.4	47^a	103	172	8.1	79

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Optics Letters