共 51 条
Cr2+-doped zinc chalcogenides as efficient, widely tunable mid-infrared lasers
被引:285
作者:
Page, RH
[1
]
Schaffers, KI
[1
]
DeLoach, LD
[1
]
Wilke, GD
[1
]
Patel, FD
[1
]
Tassano, JB
[1
]
Payne, SA
[1
]
Krupke, WF
[1
]
Chen, KT
[1
]
Burger, A
[1
]
机构:
[1] FISK UNIV,DEPT PHYS,CTR PHOTON MAT & DEVICES,NASHVILLE,TN 37208
关键词:
chromium materials/devices;
laser tuning;
lasers;
optical amplifiers;
optical materials;
solid lasers;
zinc materials/devices;
D O I:
10.1109/3.563390
中图分类号:
TM [电工技术];
TN [电子技术、通信技术];
学科分类号:
0808 ;
0809 ;
摘要:
Transition-metal-doped zinc chalcogenide crystals have recently been investigated as potential mid-infrared lasers. Tetrahedrally coordinated Cr2+ ions are especially attractive as lasants on account of high luminescence quantum yields for emission in the 2000-3000-nm range. Radiative lifetimes and emission cross sections of the upper (5)E state are respectively similar to 10 mu s and similar to 10(-18) cm(2). The associated absorption band peaked at similar to 1800 nm enables laser-diode pumping of the Cr2+ systems. Laser demonstrations with ZnS:Cr and ZnSe:Cr (using a MgF2:Co2+ laser pump source) gave slope efficiencies up to 30%. Excited-state-absorption losses appear small, and passive losses dominate at present, Tuning experiments with a diffraction grating produce a tuning range covering at least 2150-2800 nm. Laser crystals can be produced by Bridgman growth, seeded physical vapor transport, or diffusion doping, Zinc chalcogenide thermomechanical properties of interest for medium-to-high-power operation compare favorably with those of other host materials, except for the larger refractive-index derivative dn/dT.
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页码:609 / 619
页数:11
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