KGW Crystals for Stimulated Raman Scattering
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… Read more →
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| SKU | Dimensions · Coating · Description | |
|---|---|---|
| KGW-0324-24 | 10x10x70 nm·Uncoated·KGW crystal, undoped, b-cut |
Out of stock
Ships in: 62–65 calendar days
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| KGW-0324-25 | 5x5x50 mm·Uncoated·KGW crystal, undoped, b-cut |
Out of stock
Ships in: 62–65 calendar days
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| KGW-0324-26 | 5x5x50 mm·AR/AR@1064+1160 nm·KGW crystal, undoped |
Out of stock
Ships in: 62–65 calendar days
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| KGW-0324-27 | 3x3x50 mm·AR/AR@530-700 nm·KGW crystal, undoped, b-cut |
Out of stock
Ships in: 62–65 calendar days
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| KGW-701 | 7 x 7 x 30 mm·Uncoated·KGW crystal, undoped, b-cut |
2 in stock
Ships in: 2–5 calendar days
$1,575
|
| KGW-702 | 5 x 7.5 x 30 mm·BBAR/BBAR@400-700 nm·KGW crystal, undoped, b-cut |
Out of stock
Ships in: 62–65 calendar days
$1,956
|
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Specifications
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 |
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 | KGW pumped at | Ba(NO₃)₂ 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 |
| 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 |
Description
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.
