Cr<sup>2+</sup>:ZnSe and Co<sup>2+</sup>:ZnSe saturable-absorber Q switches for 1.54-µm Er:glass lasers

A. V. Podlipensky; V. G. Shcherbitsky; N. V. Kuleshov; V. P. Mikhailov; V. I. Levchenko; V. N. Yakimovich

doi:10.1364/OL.24.000960

Optics Letters
Vol. 24,
Issue 14,
pp. 960-962
(1999)
•https://doi.org/10.1364/OL.24.000960

Cr²⁺:ZnSe and Co²⁺:ZnSe saturable-absorber Q switches for 1.54-µm Er:glass lasers

A. V. Podlipensky, V. G. Shcherbitsky, N. V. Kuleshov, V. P. Mikhailov, V. I. Levchenko, and V. N. Yakimovich

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A. V. Podlipensky, V. G. Shcherbitsky, N. V. Kuleshov, V. P. Mikhailov, V. I. Levchenko, and V. N. Yakimovich, "Cr²⁺:ZnSe and Co²⁺:ZnSe saturable-absorber Q switches for 1.54-µm Er:glass lasers," Opt. Lett. 24, 960-962 (1999)

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Abstract

Passive $Q$ switching of Er:glass lasers has been demonstrated with ${Cr}^{2 +} : ZnSe$ and ${Co}^{2 +} : ZnSe$ saturable absorbers. A pulse duration of $\sim 50 ns$ and an output pulse energy of 5 mJ were obtained with both Co:ZnSe and Cr:ZnSe passive shutters. A $Q$ -switched conversion efficiency of as much as 26% was obtained for Cr:ZnSe. Theoretical modeling exhibits satisfactory agreement with experimental data.

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$Q$ -Switched Material	Cavity Length (mm)	Output Coupler Transmission (%)	$A_{g} ({mm}^{2})$ a	$A_{a} ({mm}^{2})$ b	$Q$ -Switched Output Energy (mJ)		Free-Running Energy (mJ)	$Q$ -Switched Conversion Efficiency (%)	Pulse Duration (ns)
$Q$ -Switched Material	Cavity Length (mm)	Output Coupler Transmission (%)	$A_{g} ({mm}^{2})$ a	$A_{a} ({mm}^{2})$ b	Exp.	Calc.	Free-Running Energy (mJ)	$Q$ -Switched Conversion Efficiency (%)	Exp.	Calc.
$Co : ZnSe$	620	10	1.14	1.72	3	3.8	30	10	180	149
	600	22	1.13	1.77	4.2	6.8	27	16	140	148
	300	22	0.78	1.0	3	4.8	25	12	50	73
	300	30	0.78	1.0	5.2	5.8	30	17	50	75
$Cr : ZnSe$	600	22	1.13	1.77	5	8.1	19	26	140	121
	600	30	1.13	1.77	5	9.9	21	24	130	129
	300	22	0.78	1.0	∼5c	5.8	25	25c	40	57

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