“…Lasers emitting in the blue range are useful in many fields, such as medicine, lithography, communications, display or biology. Classical wavelengths of frequency doubled solid state blue lasers are 473, 457, 456, and 458 nm [21][22][23][24][25][26][27][28][29][30]. These lasers are efficient and powerful, and it could be interesting to extend these sources to other wave lengths, in particular to deeper blue.…”