Langasite Family Midinfrared Nonlinear Optical Oxide Materials: Structure, Property, and Applications

Table 2

Comparison of the physical parameters of the LGS, LGN, and LGT.

	LGS	LGN	LGT
Point group	32	32	32
Lattice parameters, Å
	Thermal conductivity, W(m⋅K)^−1
-direction	1.3	1.4	1.2
-direction	1.9	1.7	1.7
Thermal expansion coefficient (10^−6/K)
	Specific heat, J/(g⋅K)	0.45	0.50	0.36
LDT (GW/cm^2) @ 1.064 μm	0.90	1.41	4.34
Transmission range (μm)	0.24~5.0	0.28~7.4	0.3~6.8
(@1.083 μm)	1.88021	1.92706	1.91745
(@1.083 μm)	1.89156	1.95623	1.94338
Birefringence @1.083 μm	0.01135	0.02917	0.02593
EO coefficient (pm/V)
	SHG coefficient (pm/V) @ 0.532 μm