1. General Information

• Model: ZMI‑7702

• Part Number: 8070‑0102‑02

• Manufacturer: ZYGO (AMETEK)

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

• Application: High‑precision interferometry, multi‑axis metrology, mid‑range measurements

• Cooling: Air‑cooled

• Optical Isolation: Yes

• Beam Diameter: 3 mm

• Mount: Standard mount

• Weight: ~4.65 kg

2. Optical Specifications

• Vacuum Wavelength:

  • F1 (vertical polarization): 632.991501 nm

  • F2 (horizontal polarization): 632.991528 nm

• Output Power: > 400 µW (typical 400–1000 µW)

• Polarization: Two orthogonal linear polarizations

• Beat Frequency: 20 MHz ± 1600 Hz

• Frequency Stability (1 hr, 3σ): 2 ppb

• Wavelength Stability:

  • 1 hour: 0.005 ppm (5 ppb)

  • 24 hours: ±0.01 ppm

• Beam Pointing Stability: < 0.5 arcsec/°C

• Max Range: 25 m (with 3 mm beam)

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 typical

4. Environmental

• Operating Temp: 10 °C to 30 °C

• Storage Temp: −40 °C to 75 °C

• Humidity: 0%–90% RH, non‑condensing

• Laser Safety: Class II

5. Model Code Breakdown

• 0102: ZMI‑7702, air‑cooled, 3 mm beam

• ‑02: Standard mount configuration

6. Compatibility

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

• Suitable for mid‑range, multi‑axis, high‑precision industrial and semiconductor applications.