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Cr:Forsterite (Cr:Mg2SiO4)
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Forsterite
Cr:Forsterite (Cr:Mg2SiO4) crystal is a new tunable laser material that fills the spectral void in the near-IR region. The tuning range covers the important spectral range from 1130 to 1348 nm, which provides a minimal dispersion in optical fibers. The Cr:Forsterite laser eventually explores its niche applications for semiconductor characterisation, eye-safe ranging, medical, industrial and scientific research. Both pulsed and continuous-wave (CW) laser operations have been obtained when pumped with 532, 578, 629 and 1064 nm.
   We provide Cr:Forsterite crystals with the dimensions of up to 120 mm in length and up to 30 mm in diameter. AR-coatings can be provided to meet your specific requirements.
PHYSICAL AND OPTICAL PROPERTIES:
Cr dopant concentration, at.% 0.05 ÷ 0.50
Syngony rhombic
Lattice space parameters, Å a = 4.77; b = 10.28; c = 6.00
Refractive indexes ng = 1.670; nm = 1.651; np = 1.635
Density, g/cm3 3.217
Mohs hardness 7
Axial characteristic biaxial
Thermal expansion coefficient 9.5 x 10-6 x K-1
Thermal conductivity, W x cm-1 x K-1 0.08
Stimulated emission cross section, cm-2 1.44 x 10-19
Relaxation time of terminal lasing level, ps < 10
Radiative lifetime, µs 25
Spontaneous fluorescence, µs 2.7
Absorption loss at 1230 nm, cm-1 0.007 - 0.060
Absorption coefficient at 1064 nm, cm-1 0.7 - 3.0

SPECTROSCOPIC AND LASER PROPERTIES:
Major pumping bands, nm 850 - 1200; 600 - 850; 350 - 550
Fluorescence band, nm 680 - 1400
Fluorescence lifetime at 25C, µs < 3
Lasing wavelength (center) 1235 nm (pulsed), 1244 nm (CW)
Spectral bandwidth 30 nm (pulsed), 12 nm (CW)
Typical slope efficiency 23% (pulsed), 38% (CW)
Tuning range, nm 1130 - 1348
Gain cross section, cm2 < 1.45 x 10-19

Rods with round cross-sections and slabs are manufactured
Diameter, mm (4 ÷ 10) ± 0.1
Length, mm (60 ÷ 110) ± 0.6
Ends unparallelity 10´´
Surface quality, scratch/dig 10 - 5
Flatness »/10
Orientation tolerance < 5
Orientation 001

We supply rods and slabs with different cross-sections, dimensions and coatings. Different dopants compositions with different concentrations are available for specific customer requirements.

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  
Dopant conc.:
% ;      Orientation:
Dimensions/Tolerances:
For example:
10.0 +/- 0.1
Coating:

For example: 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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