The results of the experiments with AgGaS2 element
Pump wavelength (mm) 1.06
30 ps mode-locked output wavelength (mm) 4 - 10
Quantum conversion efficiency (%)
2.8 ( l = 5.2 mm)
1.6 ( l = 6.3 mm)
0.6 ( l = 7.1 mm)
Application
The AgGaS2 crystals are used for
frequency doubling and three-frequency mixing. The parametric oscillators on the base
of those crystals can produce the continuously tunable wavelength of radiation in the
spectral range from 1.0 to 10 mm with suitable pump laser.High quality of nonlinear
AgGaS2 elements and their big length make it possible to achieve the
high conversion efficiency. The parametric generation in AgGaS2
crystals being pumped by a single picosecond pulse of a Nd3+: YAG laser (1.064 mm)
has been investigated in 2.2 - 7.4 mm
spectral range. The higher conversion efficiency than reported before (for optical parametric
oscillators with picosecond pulse length in this spectral range) has been achieved due to
non-collinear two-crystal configuration.On the base of one AgGaS2 element
the two-pass OPO has been realized. This device has some advantages in comparison with two-crystal
OPO without of losing the conversion efficiency.