Langasite Lanthanum Gallium Silicate LGS Piezoelectric Effect Crystals
Langasite Lanthanum Gallium Silicate LGS Piezoelectric Crystal for Q-switch
Langasite - Lanthanum Gallium Silicate, is a piezoelectric crystal of gallogermanate family . Though langasite was initially developed as a laser crystal, it revealed a remarkable combination of piezoelectric qualities, which opened up new opportunities to use the LGS crystal in radio frequency devices. The main applications of langasite crystals now is SAW filters and SAW resonators.
Main Properties:
| Crystal Structure | rigonal system, group 33 a= 8.1783 c = 5.1014 |
| Growth Method | Czochralski |
| Hardness | 6.6 Moh's |
| Density | 5.754 g/cm3 |
| Melt Point | 1470 o C ( phase transition point: N/A) |
| Thermal expansion (x10-6/ oC) | α 11: 5.10 α 33: 3.61 |
| Acoustic velocity, SAW | 2400 ( m/sec ) |
| Frequency constant, BAW | 1380 ( kHz/mm ) |
| Piezoelectric coupling | K2 (%) BAW: 2.21 SAW: 0.3 |
| Inclusions | N0 |
Features:
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High damage threshold
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Good optical rotation
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Can withstand high and low temperature changes
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Stable physical and chemical properties
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High electromechanical coupling coefficient (3 times of quartz)
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Low equivalent series resistance
Main Appliaction :
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electro-optic Q-switch
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SAW device
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BAW device
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Sensor
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High power high repetition rate all solid state laser
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High and low temperature change laser
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