Materials and Spectroscopic properties of

Cr2+ and Fe2+ doped II-VI semiconductors

at 5T2«5E Transition

(sab, sem,—peak absorption and emission cross-sections; lab, lem—peak absorption and emission cross-section wavelengths, respectively; DlFWHM –full bandwidth at half maximum; trad radiative life tame; tRT(t77K) –luminescence lifetime at room temperature and 77K; second (dij) and third  order  nonlinear

Host

ZnS

ZnSe

ZnTe

CdS

CdSe

CdTe

Physical properties

Crystal lattice*

ZB

ZB

ZB

W

W

ZB

Band Gap, eV

3.7

2.7

2.3

2.5

1.7

1.5

Bond length, Ĺ

2.34

2.45

2.60

2.52

2.62

2.81

Max optical phonon n, cm-1

350

250

207

304

211

169

Thermal conductivity, W/cmK

0.27

0.18

0.108

0.2

0.09

0.075

Refractive index @3µm

2.26

2.44

2.7

2.30

2.46

2.7

n-1 dn/dT, 10-5**

1.9

2.6

6

4

4

4.4

Max dij, pV/m

12@1µm

43@1µm

119@1µm

19@1µm

65@1µm

109@1µm

g at 1µm, ´1020 m2/W

84

~350

1200

500

150

3000

 

 

 

 

 

 

 

Host

ZnS

ZnSe

ZnTe

CdS

CdSe

CdTe

Spectroscopic properties of Cr2+ ions

Peak sab´10-18 cm2

1.0

1.1

1.2

1.5

1.9

2.2

Peak lab, µm

1.69

1.77

1.79

1.85

1.92

1.92

Bandwidth Dlab, µm

0.32

0.35

0.34

0.41

0.44

0.41

 

 

 

 

 

 

 

Peak sem´10-18 cm2

1.4

1.3

1.9

1.3

1.1

 

Peak lem, µm

2.35

2.45

2.4

2.6

2.75

 

Bandwidth Dlem, µm

0.82

0.86

0.87

1.1

1.2

 

 

 

 

 

 

 

 

t at RT, µs

4.3

5.5

3

1.2

3.7

2.9

trad , µs

5.7

5.5

3

7.6

5.5

3.3

 

 

 

 

 

 

 

Spectroscopic properties of Fe2+ ions

Peak sab´10-18 cm2

0.92

0.97

 

 

1.5

1.7

Peak lab, µm

2.8

3.1

 

3.15

3.5

3.65

Bandwidth Dlab, µm

1.22

1.35

 

1.54

1.81

1.94

 

 

 

 

 

 

 

Peak sem´10-18 cm2

1.1

1.1

 

 

3.2

1.4

Peak lem, µm

3.94

4.35

 

 

4.81

5.94

Bandwidth Dlem, µm

0.91

1.13

 

 

1.37

1.79

 

 

 

 

 

 

 

t at RT, µs

0.05(2.7)

0.38(57)

 

 

0.05

0.24(68)

trad , µs

55

57

 

 

 

72

 

 

 

 

 

 

 

*)

Dominant Crystal structure at RT, Zinc Blende (ZB) and wurtzite (W) crystal structure

References

Sergey Mirov, Igor Moskalev, Sergey Vasilyev, Viktor Smolski, Vladimir Fedorov, Dmitry Martyshkin, Jeremy Peppers, Mike Mirov, Alex Dergachev, and Valentin Gapontsev, "Frontiers of mid-IR lasers based on transition metal doped chalcogenides," in IEEE Journal of Selected Topics in Quantum Electronics, 24(5) 1601829, 29pp (2018).