High-power short-wavelength fiber laser device

A high-power, short-wavelength fiber laser device operating in the blue light spectrum comprising:

• a first optical source configured and arranged to emit a first light beam at a first wavelength λ1 of about 1900 nm, said first optical source comprising a Thulium-doped fiber laser;
• a first non-linear converter responsive to the first light beam λ1 for frequency doubling said first light beam λ1 to produce a frequency-doubled first light beam at a wavelength λ1′ of about 950 nm;
• a second optical source configured and arranged to emit a second light beam at a second wavelength λ2 of about 1550 nm, said second optical source comprising an Erbium-doped fiber laser;
• a second non-linear converter responsive to the second light beam λ2 for frequency doubling said second light beam λ2 to produce a frequency-doubled second light beam λ2′ at a wavelength of 775 nm;
• a beam combiner configured and arranged to combine said frequency doubled first light beam λ1′ and said frequency doubled second light beam λ2′ to produce a combined beam;
• and
• a non-linear sum frequency mixer responsive to the combined beam for sum frequency mixing the first and second light beams λ1′,λ2′ in the combined beam to produce a short wavelength beam of light having a wavelength λs of about 427 nm.