Borate Crystals for Nonlinear Optical and Laser Applications: A Review

Table 2

Comparison between RECOB crystals.

Properties	YCOB	GdCOB	LCOB
Unit cell parameters	𝑎=8.04 Å	𝑎=8.09 Å	𝑎=8.16 Å
	𝑏=15.95 Å	𝑏=16.01 Å	𝑏=16.08 Å
	𝑐=3.51 Å	𝑐=3.55 Å	𝑐=3.63 Å
Bond angle	𝛼=𝛾=90^∘	𝛼=𝛾=90^∘	𝛼=𝛾=90^∘
	𝛽=101.19^∘	𝛽=101.27^∘	𝛽=101.3^∘
Crystal system	Monoclinic	Monoclinic	Monoclinic
Space group	𝐶𝑚	𝐶𝑚	𝐶𝑚
Hygroscopicity	Nonhygroscopic	Nonhygroscopic	Nonhygroscopic
Transparency range	220–3600 nm	320–2700 nm	Above 210 nm
Melting point	1510°C	1480°C	1410°C