High Gray Track Resistance KTP Elements (HGTR KTP)
高出力グリーンレーザ発生用、劣化が少ない
Raicol produces KTP crystals with gray track resistance up to ten times greater than typical flux grown KTP. This is possible due to advances in the controlled growth of KTP crystals, using proprietary modified fluxes and heat treatment. These HGTR KTP elements are suitable for high power density applications, where many other KTP elements would suffer from gray tracks or photorefractive breakdown.
仕様
| KTP Crystals | |
| Absorption coefficient | α < 10-5 cm-1 at 1064 nm and α < 0.01 cm-1 at 532 nm |
| Domain structure | Single domain |
| Guaranteed Damage threshold | 600 MW/ cm2 1064 nm, for 10 ns pulses |
| KTP Elements for SHG, SFM, DFM and OPO | |
| Fabrication | Cut from single growth sector |
| Apertures | up to 8 × 8 mm2 |
| Length | up to 12 mm along X axis |
| AR coatings | dual band R<0.2 % |
| Optical Polishing Capabilities | |
| Flatness | λ/10 |
| Parallelism | 5 arc sec |
| Perpendicularity | 5 arc min. |
| Scratch/dig | None at ×100 magnification |
Gray-tracking Effect in KTP Crystals
IR (1064 nm) absorption growth under 10 KW/cm2 of green light (514 nm)
In the GRIIRA (Green Induced Infrared Absorption) test, an infrared laser beam passes through the KTPelement.
The initial measurement (at time 0) is the infrared absorption of the crystal. After a few seconds, a greenlaser beam is allowed to go through the crystal as well. The green light causes an increase in the IR absorptionof the crystal.
This effect has been show to correlate with gray tracking in KTP crystals.The above graph shows that the Raicol HGTR KTP elements have both a lower initial IR absorption, andare affected less by the green laser. Thus, Raicol HGTR KTP is expected to have a higher gray track resistancethan regular flux grown crystals or hydrothermally grown crystals.
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