Y. Kitaoka et al., Quasi-phase-matched second harmonic generation device in Mg-doped LiNbO3 and its application to high-density optical disk system, B MATER SCI, 22(3), 1999, pp. 405-411
The resistance to photorefractive damage is investigated for several nonlin
ear crystals. A quasi-phase-matched (QPM) second harmonic generation (SHG)
waveguide device is fabricated in 5 mol% Mg-doped LiNbO3 which has high res
istance to optical damage. The SHG blue laser of the QPM-SHG waveguide devi
ce and a tunable distributed Bragg reflector (DBR) laser diode is demonstra
ted, wherein output stability of continuous blue light is measured. The SHG
blue laser, using the QPM-SHG waveguide device with broadened flat matchin
g response, shows good modulation characteristics. The pulsed peak power of
23 mW with rectangular modulated waveform is generated. The SHG blue laser
is installed to an optical head, and good recording and readout characteri
stics are demonstrated. Moreover, butt-coupled SHG blue laser is examined t
o gain a miniature module with volume of 0.8 cc.