Recent achievements on middle and far-infrared second-order nonlinear optical materials

Synthesis, Crystal Structures, Optical Properties and Theoretical Calculations of Two Metal Chalcogenides Ba2AlSbS5 and Ba2GaBiSe5

“…As for Ba 2 AlSbS 5 , its asymmetrical unit is composed of one Ba, one Al, one Sb, and four S atoms. As can be seen from its structure, the Al atoms are linked with four S atoms to form AlS 4 (Figure 2a-c). The Ba atoms are connected with eight S atoms to form typical BaS 8 dodecahedra.…”

“…Metal chalcogenides have been used as critical materials in the development of modern science and technology because of their structural complexities and fascinating properties [1][2][3][4][5][6][7][8][9][10][11][12]. Among them, many trivalent cations (such as M III ': As, Sb, or Bi) containing chalcogenides have been discovered and shown to have various application prospects.…”

Coexistence of Strong Second Harmonic Generation Response and Wide Band Gap in AZn4Ga5S12 (A=K, Rb, Cs) with 3D Diamond‐like Frameworks

“…[1][2][3][4][5][6] However,t he lack of good performance MIR NLO materials is ab ig issue. [1][2][3][4][5][6] However,t he lack of good performance MIR NLO materials is ab ig issue.…”

“…Mid-infrared (MIR) nonlinear optical( NLO) crystalsi nt he range of 2-20 mmh ave many crucial applications, including long-distance laser communication, resource exploration, and optoelectronic devices, to name af ew. [1][2][3][4][5][6] However,t he lack of good performance MIR NLO materials is ab ig issue. The commercial MIR NLO materials are, AgGaQ 2 (Q = S, Se) [7,8] and ZnGeP 2 , [9] but each of them unfortunately suffers drawbacks that limit its applications.I ng eneral, outstanding MIR NLO materials should satisfy the following conditions:1 )strong second harmonic generation (SHG) coefficient d ij ;2 )large laser induced damage threshold (LIDT);3 )wide optical transparency,w hich is able to run across two important atmospherict ransparent windows (3-5 and 8-12 mm);4 )good IR phase-matchinga bility and moderate optical birefringence (0.03 < Dn < 0.10);5 )high thermal and environmental stabilitya nd so on.…”

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[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] second-order nonlinear optical( NLO) materials with outstanding performances are of great importance in laser science and technology. However,t he enormousc hallenge to design and synthesize an excellent MIR NLO material lies in achieving simultaneously as trong second harmonic generation (SHG) response [d ij > 0.6 AgGaS 2 (AGS)] and wide band gap (E g > 3.5 eV).

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