Product Description
Coherent 7800 Acousto-Optic Q-Switch – High-Power Nd:YAG Laser Modulator
This used Coherent 7800 is a high-performance acousto-optic Q-switch designed for pulsed Nd:YAG laser systems operating at 1064 nm . The Q-switch is a critical component that allows a laser to produce short, high-energy pulses by modulating the resonator’s quality factor (Q) .
The crystal quartz AO medium offers excellent optical transmission and high damage threshold, making it suitable for demanding scientific and industrial applications. The device features an AR coating (R < 0.2%) for minimal insertion loss .
Condition Note: This unit is untested and sold as-is. No RF driver is included unless specified.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Coherent, Inc. |
| Model | 7800 |
| AO Medium | Crystal Quartz |
| Center Wavelength | 1064 ± 30 nm |
| Active Aperture | 3 x 1.5 mm, 4 x 2.5 mm, or 4 x 3.0 mm |
| RF Frequency Options | 40.68 MHz, 68 MHz, or 80 MHz |
| Loss Modulation | > 85% |
| Max. Insertion Loss | 1% |
| Rise/Fall Time | < 180 ns |
| Optical Power Density | 1000 MW/cm² |
| Max Operational RF Power | 20 W |
| RF Input Impedance | 50 Ω |
| Coating | AR R < 0.2% @ 1064 ±5 nm |
| Cooling | Conduction cooled |
| Operating Temperature | 0°C to 50°C |
| Condition | Used – Untested |
Applications
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Nd:YAG Laser Systems: Q-switching for pulsed operation
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Scientific Research: Time-resolved spectroscopy, materials processing
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Industrial Lasers: Marking, drilling, and cutting
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Medical Lasers: Dermatology and surgical applications
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LIDAR Systems: Atmospheric sensing and ranging
RF Driver Compatibility
The Coherent 7800 Q-Switch requires an external RF driver providing:
-
Power: Up to 20 W
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Impedance: 50 Ω
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Frequency: 40.68, 68, or 80 MHz (verify the unit’s frequency from its label)
The RF driver also needs a TTL-compatible pulse input to control the Q-switch timing.
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