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| Non-linear crystal Silver Selenogallate (AgGaSe2 or AGSe) | |
| A closely to Silver Thiogallate
(AgGaS2 or AGS) related crystal, Silver Selenogallate (AgGaSe2
or AGSe), is also available. AgGaSe2 has band edges at 0.71 and
18 µm. It's bulk quality is excellent across the transmission
range. There is no residual e-ray absorption centred around 1800
nm. The phase matching and non-linear optical properties of AgGaSe2
allow various SFM/DFM interactions from the visible to mid-IR,
these includes non-critically phase matched DFM using selected
wavelengths (available from tunable dye and Ti:Sapphire lasers)
and OPO's pumped with commonly available Nd:YAG lasers.Tuning
within 2.5–12 µm was obtained when pumped by Ho:YLF laser at 2.05
µm; NCPM operation within 1.9–5.5 µm was achieved pumping at 1.4–1.55
µm. Efficient SHG of pulsed CO2 laser is demonstrated. The AgGaSe2
crystals are also used for frequency doubling and three-frequency
mixing. The parametric oscillators on the base of those crystals
can produce the continuously tunable radiation in the spectral
range from 1.34 mm to 18 mm with suitable pump laser. The low
absorption of AgGaSe2 crystals results in the fact, that 80 mm
length element has transmission value 66.4% on 1.06 mm wavelength,
which is in accordance with the theoretical value of Fresnel loses
for the crystal without of any absorption. With those crystals
the record results of conversion efficiency in comparison with
all known infrared materials have been obtained. SHG efficiency
of CO2 laser radiation for 40 mm length elements was about 20%
(pulse length – 80 ns, pump energy - 2 J)
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