Hi Maksym,

You may make an inquiry at Alfa Chemistry, they offer you advices and kinds of good-quality chemicals.

https://www.alfa-chemistry.com/inquiry

Dear Maksym,

LGS and LGSe crystal can be purchased today from only one supplier. :)

There are also many new very interesting nonlinear materials with high laser damage and large nonlinearity coefficients.

Write a private message, I’ll send you contact information.

Sincerely,

Dmitry.