1. General Information

• Part Number: 8070-0902-03

• Model: ZMI‑7705

• Manufacturer: ZYGO (AMETEK)

• Type: Compact Zeeman‑split Dual‑Frequency HeNe Laser Head

• Application: Semiconductor lithography, precision stage positioning, laser interferometry

• Matching System: ZMI‑2001 / ZMI‑501A, Nikon NSR series scanners

• Cooling: Air‑cooled

2. Optical Specifications

• Laser Type: CW HeNe gas laser, two‑frequency, linearly polarized

• Vacuum Wavelength: 632.8 nm

• Polarization: Two orthogonal linear polarizations

• Beat Frequency (Split Frequency): 3.6 MHz (Zeeman)

• Output Optical Power: ≥ 250 µW

• Beam Diameter: 4 mm

• Max Measuring Range: 2 m (standard)

• Beam Pointing Stability: < 0.5 arcsec/°C

• Frequency Stability (1 hr, 3σ): 10 ppb

• 24‑hr Wavelength Stability: ±0.01 ppm

• Warm‑up to full stability: < 10 min typical

3. Electrical Parameters

• Input Power: ±15 VDC

  • +15 V: 1.8 A

  • −15 V: 1.0 A

• Rated Operating Power: ~28 W

• Max Warm‑up Power: ~42 W

• Laser Onset Time: < 10 s typical

4. Mechanical Characteristics

• Weight: 3.8 kg

• Construction: Anodized aluminum alloy

• Mounting: Standard fixed feet

5. Environmental Conditions

• Operating Temperature: 10 °C to 30 °C

• Storage Temperature: −40 °C to +70 °C

• Humidity: 0%–90% RH, non‑condensing

6. Safety

• Laser Safety Class: Class II

• Compliance: IEC 60825

7. Compatibility

• Works with ZMI‑2001 (8020‑0210) single‑axis VME/ISA boards

• Works with ZMI‑501A measurement unit

• Designed for short‑range, high‑precision displacement measurement