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Non-linear Crystal Mercury Thiogallate (HgGa2S4 or HGS)
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Mercury Thiogallate
High values of laser damage threshold and conversion efficiency allow to use Mercury Thiogallate HgGa2S4 (HGS) non-linear crystals for frequency doubling and OPO/OPA in the wavelength range from 1.0 to 10 µm. It was established that SHG efficiency of CO2 laser radiation for 4 mm length HgGa2S4 element is about 10 % (pulse duration 30 ns, radiation power density 60 MW/cm2). The high conversion efficiency and wide range of radiation wavelength tuning allows to expect that this material may compete with AgGaS2, AgGaSe2, ZnGeP2 and GaSe crystals in spite of the considerable difficulty of big size crystals growth process.

APPLICATIONS:
• Generation second harmonics on CO and CO2 - lasers • Different frequency generator to middle infrared regions.
• Optical parametric oscilator • Frequency mixing in the middle IR region

Literature: F. Rotermund, V. Petrov and F. Noack, Difference-frequency generation of intense femtosecond pulses in the mid-IR (4-12 µm) using HgGa2S4 and AgGaS2. Opt. Commun. 185 (2000) 177-83
MAIN PROPERTIES:

Transparency range, µm 0.55 - 13.00
Negative uniaxial crystal no > ne
Point group 4
Mohs hardness 3 - 3.5
Density, g/cm3 4.95
Energy gap, eV 2.34
Dispersion of refractive indices (Experimental values):
at 0.5495 µm no = 2.6592; ne = 2.5979
at 0.6500 µm no = 2.5796; ne = 2.5264
at 1.0760 µm no = 2.4774; ne = 2.4324
at 3.5400 µm no = 2.4386; ne = 2.3979
at 11.000 µm no = 2.3690; ne = 2.3290
Non-linear coefficients d36 (1.064 mm) = 1.8 d36 ( AgGaS2 ) ± 15% = (35.2 ± 5.3 ) pm/V
  d31 (1.064 mm) = 0.6 d36 ( AgGaS2 ) ± 15% = (11.7 ± 1.8 ) pm/V
Optical damage threshold, MW/cm2 60 - 90 at surface (1064nm, 10 ns)

  We supply HGS optical elements made according to customers' order.

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:

For example: SHG@1064; SFG@800+267->200; DFG@780-842->10600; OPO@355->460÷560+960÷1150; etc.
polished sites:

BLOCK    or  BLOCK
 a-b b-c a-c
or d  
Type & angles:
 I    II         angles:  theta  , phi
Dimensions/Tolerances:
For example:
10.0 +/- 0.1
Coating:

For example: p-coating, ARC s1/s2 1064 R<0.25%; ARC s1/s2 1064 R<0.25%+532<0.5%;
BBAR s1/s2 1064 R<1%+3÷10<5% etc.
a = mm;
c = mm
b     = mm or
dia. = mm;
This field is for additional information such as application,
comments, add. requirements etc.

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