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Phone: +86 16626708626Description
3. Key Technical Specifications
The Zygo ZMI 7702 Laser Head generates a stable two-frequency (heterodyne) He-Ne laser beam for multi-axis interferometric feedback systems, delivering high frequency stability and sub-nanometer measurement precision.
| Parameter | Value |
|---|---|
| Model / Series | Zygo ZMI 7702 (8070-0102 Series) |
| Manufacturer | Zygo Corporation |
| Laser Type | Helium-Neon (He-Ne), Continuous Wave, Two-Frequency |
| Vacuum Wavelength | 632.8 nm (Red) |
| Output Power | > 400 µW (up to > 650 µW depending on variant) |
| Polarization | Collinear, orthogonally linear polarized frequencies |
| Beam Diameter | 3 mm or 6 mm (model dependent) |
| Beam Pointing Stability | < 0.5 arcsec/°C |
| System Compatibility | ZMI 2000 / ZMI 240X / 4X04 VME & PCI Measurement Boards |
4. Product Introduction & Supply Chain Strategy
The Zygo ZMI 7702 Laser Head serves as the central optical reference source for precision displacement measuring interferometers (DMI). Used extensively in semiconductor wafer stages, flat panel display inspection, and ultra-precision CNC machinery, it generates two orthogonally polarized optical frequencies with a tight split frequency. These frequencies interact with external optical receivers and measurement cards (e.g., ZMI 2000 series) to track position changes down to sub-nanometer levels in real time.
Holding a genuine New Surplus Zygo 7702 Laser Head in reserve is essential for avoiding catastrophic fab downtime. Laser tubes experience gas depletion and power degradation over years of continuous operation. Securing a unused, factory-sealed surplus unit guarantees clean optical coatings, full rated output power, and precise beam pointing stability without the risks of thermal drift or low output associated with worn, high-hour refurbished units.
7702
7702
5. Installation & Configuration Guide
Laser Safety & Optical Handling Warning
Class 2 / Class 3R laser product. Direct eye exposure can cause permanent ocular damage. Ensure laser power supplies are turned off before performing physical alignment, and always wear appropriate 632.8 nm laser safety eyewear during beam path setup.
1
Power Disconnection & Enclosure Prep
Prerequisite
1.Power Disconnection & Enclosure Prep:Prerequisite.
Power down the external Zygo Laser Head Power Supply unit (e.g., ZMI LH Power Supply). Ensure the optical pathway and stage environment are clean and isolated.
2
Kinematic Base Alignment
Mechanical Mounting
2.Kinematic Base Alignment:Mechanical Mounting.
Secure the ZMI 7702 laser head onto its precision kinematic mounting base or stage enclosure using low-stress mounting hardware to avoid twisting the internal tube optics.
3
High-Voltage Cable Connection
Interconnects
3.High-Voltage Cable Connection:Interconnects.
Connect the high-voltage power cable and optical reference pickup cable from the laser power supply unit directly to the designated rear sockets of the 7702 head.
4
Thermal Stabilization & Optical Tuning
Alignment & Warm-up
4.Thermal Stabilization & Optical Tuning:Alignment & Warm-up.
Switch on the laser power supply. Allow a minimum 30-minute thermal stabilization period to ensure frequency locking, then adjust alignment optics until target receivers detect peak optical power.
6. Firmware/Software Versions & Upgrade Notes
- Hardware Compatibility: Operates seamlessly with Zygo ZMI 2000, 240X, and 4X04 VME/PCI VMEbus axis processing boards.
- Thermal Management: The 7702 relies on natural air convection; ensure at least 50 mm clearance around ventilation ports for stable frequency drift performance.
- Power Supply Matching: Must be driven by a compatible Zygo ZMI laser head power supply providing correct cathode/anode operating voltages and reference signal pickoff circuits.
7. Frequently Asked Questions (FAQ)
Q: Is this Zygo ZMI 7702 laser head genuinely new? A: Yes, this item is a Brand New Surplus unit. It has zero operating hours on the He-Ne tube, was never installed on a fab tool, and is preserved in static-shielding and optically protective packaging.
Q: Why choose New Surplus over a refurbished laser head? A: Helium-Neon laser tubes suffer from gas leakage and internal mirror degradation over time. Refurbished or used laser heads often have low beam power output and high thermal frequency drift. New Surplus guarantees full factory output power (>400 µW to >650 µW) and optimal signal-to-noise ratio across all optical axes.
Q: What is the difference between the 3 mm and 6 mm beam variants? A: The beam diameter (3 mm or 6 mm) determines optical aperture sizing and total allowable beam path length. Larger beam diameters reduce divergence over long axis distances, allowing measurement over longer travel ranges.
Q: What warranty accompanies this unit? A: Every Zygo ZMI 7702 Laser Head comes with a full 1-year replacement warranty and a certified optical power and quality inspection report prior to shipment.
