1. General Information

• Model: ZMI‑7702 (7702)

• Part Number: 8070‑0102‑02

• Manufacturer: ZYGO (AMETEK)

• Type: Helium‑Neon (HeNe), CW, Two‑Frequency, Linearly Polarized

• Application: Laser interferometry (ZMI‑240X/4X04), semiconductor, ultra‑precision positioning

• Beam Diameter: 3 mm (max range 2 m, short range)

• Mount: Narrow mount

• Dimensions: ~450 × 100 × 80 mm

• Weight: 4.65 kg (10.25 lb)

2. Optical Specifications

• Vacuum Wavelength: 632.8 nm

• Output Power: > 400 µW (0.4 mW)

• Polarization: Two orthogonal linear polarizations

• Beat Frequency: 20 MHz ± 1600 Hz

• Wavelength Stability:

  • 1 hour: 0.005 ppm (5 ppb)

  • 24 hours: ±0.01 ppm

• Beam Pointing Stability: < 0.1 arcsec/°C

3. Electrical & Power

• Power Supply: ±15 VDC ±0.5 V

  • +15 V: 2.1 A

  • −15 V: 1.2 A

• Power Dissipation (max):

  • Warm‑up: 50 W

  • Operation: 39 W

• Warm‑up Time:

  • Laser out: < 10 s typical, 70 s max

  • Full stability: ~10 min

4. Environmental

• Operating Temp: 10 °C to 30 °C

• Storage Temp: −40 °C to 75 °C

• Humidity: 0%–90% RH, non‑condensing

• Cooling: Air‑cooled (no fan)

• Laser Safety: Class II

5. Model Code (8070‑0102‑02)

• ‑02: 3 mm beam, >400 µW, narrow mount

6. Compatibility

• Works with ZYGO ZMI‑240X, ZMI‑4X04 interferometer boards.

• Ideal for short‑range (<2 m), multi‑axis precision measurements.