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KGW Crystals for Stimulated Raman Scattering

KGW Crystals for Stimulated Raman Scattering

For picosecond pulses we offer undoped KGW crystals that feature high damage threshold, making the crystal an excellent candidate for power scaling.

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delivery Estimated delivery time: 15 - 16 days
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Code Description Dimensions Coating Price Delivery Add to cart
KGW-701 KGW crystal, undoped, b-cut 7x7x30 mm Uncoated 690 $ Request
KGW-702 KGW crystal, undoped, b-cut 5x7.5x30 mm BBAR/BBAR@400-700 nm 903 $ Request

KGW Physical and Optical Properties

Crystal symmetry Monoclinic, C2/c
Transmission range 0.35-5.5 µm
Density 7.27 g/cm3
Hardness Mohs 4-5
Refractive indices @ 1064 nm ng = 2.061; np = 1.982; nm = 2.010
Raman shift

901 cm-1 (p[mm]p)
768 cm-1 (p[gg]p)

Raman gain, pump 1064 nm

3.3 cm/GW (901 cm-1)
4.4 cm/GW (768 cm-1)

Thermal conductivity, W/mK Ka = 2.6; Kb = 3.8; Kc = 3.4
Thermo-optic coefficients @ 1064 nm dnp/dT=-15.7 x 10-6 K-1
dnm/dT=-11.8 x 10-6 K-1
dng/dT=-17.3 x 10-6 K-1
Optical Damage threshold > 10 GW/cm2

 
KGW Physical and Optical Properties

STANDARD SPECIFICATIONS Ba(NO3)2 KGW
Surface quality 40/20 scr/dig 10/5 scr/dig
Flatness λ/4 @ 633 nm λ/8 @ 633 nm
Maximum elements dimensions 10x10x100 mm 10x10x80 mm

 

Stokes generation wavelengths in KGW crystal with oscillation coefficient 901.5 cm-1 and Ba(NO3)2 crystal are given in the table below. 

Stokes

KGW pumped at

Ba(NO3)2 pumped at

Efficiency,
%
532 nm 1064 nm 532 nm 1064 nm
1 Stoke 558 1177 563 1197 35-70
2 Stoke 588 1316 598 1369 20-40
3 Stoke 621 1494 638 1599 10-15
4 Stoke 658 1726 684 1924 < 10
1 Antistoke 507   970 503   957 10-30
EKSMA Optics KGW Crystals for Stimulated Raman Scattering
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EKSMA OPTICS offers crystalline materials - Barium Nitrate - Ba(NO3)2 and undoped potassium gadolinium tungstate KGd(WO4)2 or KGW which have attracted much interest as most suitable crystals for stimulated Raman scattering (SRS). These materials can be used for frequency conversion in lasers for extending of tuning range. SRS in crystals is compatible with current all-solid-state technology and provides a very simple, compact means of frequency conversion.

 

KGW Crystals

Thermal effects are significantly smaller in KGW. This along with the high damage threshold make the crystal an excellent candidate for power scaling. Comparing Ba(NO3)2 and KGW for Raman application Ba(NO3)2 are more effective in case of ns pulses and KGW – in case of ps pulses.