1. General Information

• Model: ZMI-7702 (7702)

• Part Number: 8070-0102-01X (X = 1/2/3/4...)

• Manufacturer: ZYGO (AMETEK)

• Type: Helium-Neon (HeNe), Continuous Wave (CW), Two-Frequency, Linearly Polarized

• Applications: Laser interferometry (with ZMI-240X/4X04 boards), semiconductor metrology, ultra-precision positioning, machine tools

• Dimensions: Approx. 450 × 100 × 80 mm

• Weight: 5.5 kg (12 lb)

2. Optical Specifications

• Vacuum Wavelength:

  • F1 (vertical polarization): 632.991501 nm

  • F2 (horizontal polarization): 632.991528 nm

• Output Power:

  • Standard: > 400 µW (0.4 mW)

  • High Power: > 525 µW (0.525 mW)

  • Max: < 1 mW

• Beam Diameter & Max Range:

  • 3 mm → 2 m (short range)

  • 6 mm → 25 m (long range)

• 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

  • Lifetime: ±0.1 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 light out: < 10 s typical, 70 s max

  • Full wavelength stability: < 10 min typical

4. Environmental

• Operating Temperature: 10 °C to 30 °C

• Storage Temperature: −40 °C to 75 °C

• Humidity: 0%–90% RH, non-condensing

• Cooling: Air-cooled (no fan)

• Laser Safety: Class II, compliant with NCDRH regulations

5. Model Variants (8070-0102-01X)

• -31: 6 mm, >400 µW, narrow mount

• -32: 3 mm, >400 µW, narrow mount

• -33: 6 mm, >400 µW, wide mount

• -34: 3 mm, >400 µW, wide mount

• -35: 6 mm, >525 µW, narrow mount

• -36: 3 mm, >525 µW, narrow mount

6. Key Features

• Air-cooled, no fan, low noise

• Two-frequency HeNe for sub-nanometer interferometry

• Ultra-stable wavelength (5 ppb/hour)

• Low beam drift and high pointing stability

• Fully compatible with ZYGO ZMI-240X/4X04 interferometer boards