2.3- and 4.4-μm Lasing in Cr, Fe:Zn1 –xMnxSe (x = 0.3) Single Crystal Pumped by Q-Switched Er:YLF Laser at 1.73 μm

• Published in: Physics of wave phenomena Vol. 28; no. 3; pp. 231 - 235
• Main Authors: Říha, A., Doroshenko, M. E., Jelínková, H., Němec, M., Jelínek, M., Šulc, J., Vyhlídal, D., Kovalenko, N. O., Terzin, I. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-07-2020; Springer Nature B.V
• Subjects: Acoustics; Energy transfer; Excitation; Ferrous ions; Laser Radiation and Its Application; Lasers; Lasing; Optical pumping; Oscillations; Physics; Physics and Astronomy; Q switched lasers; Quantum Optics; Single crystals; YLF lasers
• ISSN: 1541-308X; 1934-807X
• DOI: 10.3103/S1541308X20030176

Novel Cr
2+
and Fe
2+
co-doped Zn
1–
x
Mn
x
Se (
x
= 0.3) crystal with Cr
2+
to Fe
2+
ions concentration ratio of about 1 : 2 (both doping ions concentration were at the ~10
18
cm
–3
level) with a good optical quality was synthesized. Under pumping by a Q-switched Er:YLF laser at 1.73 μm, the oscillations of Cr
2+
ions at 2.3 μm as well as Fe
2+
ions at 4.4 μm were realized. Both regimes, i.e. intracavity pumping of Fe
2+
ions by Cr
2+
ions as well as excitation through the Cr
2+
→ Fe
2+
ions energy transfer mechanism, were demonstrated. The output energy for Cr
2+
ions lasing at 2.3 μm was up to 900 μJ while Fe
2+
ions lasing at 4.4 μm reached up to 60 μJ in the intracavity pumping mode. In the Cr
2+
→ Fe
2+
energy transfer mode, the maximum output energy was 20 μJ at 4.4 μm. Laser generation at 2.3 μm was observed up to 340 K while Fe
2+
ions oscillations stopped for temperatures above ~150 K. The Fe
2+
ions oscillation wavelength was observed to shift with temperature increase from ~4.4 μm at 78 K to ~4.5 μm at 150 K. The Fe
2+
ions output pulses were quite stable in amplitude and temporal domain in both excitation modes with beam profile close to the fundamental transversal mode.