The HP/Agilent 5501A Laser Head is a Helium-Neon laser source engineered for precision interferometric and metrology applications. It delivers a coherent, split-beam output with Zeeman frequency modulation, requiring zero warm-up time and operating with automatic tuning. The laser head serves as the core reference component in high-resolution positioning and measurement systems, providing a differential squarewave reference signal at approximately 1.8 MHz for direct compatibility with Laser Transducer System output accessories.
Technical Specifications
• Laser Type: Helium-Neon with Zeeman frequency split beam
• Beam Power Output: Maximum 1 mW
• Beam Diameter: 7 mm standard; Option 009 provides 9 mm for specific interferometer applications
• Reference Signal: Differential squarewave at approximately 1.8 MHz (1.5–2.0 MHz operating range); TTL-compatible
• Warm-up Time: None
• Tuning: Automatic with remote RETUNE command capability
– Electrical Specifications
• Power Requirements: +15 Vdc ± 0.25 Vdc at 0.6 A; −15 Vdc ± 0.25 Vdc at 0.5 A
• Internal Fuses: 2 A fuses permit power distribution to additional Laser Transducer units
• Diagnostic Outputs: TTL-level signals for operational status monitoring
– Key Features
• Laser tube assembly with integrated cathode current control maintains optimal tube current through high-voltage adjustment
• Regulator circuits optimize laser operation and stability
• Diagnostic circuits provide visual and electrical status indication
• Front beam shutter for safety control
• Safety interlock disables high voltage upon cover removal
• NEMA Type 12 enclosure; 3.9 kg (8.5 lb)
– Compatibility & Integration
The 5501A integrates with all Laser Transducer System output accessories via reference signal output. System interconnection uses custom-fabricated cables. The Agilent 5501B laser head provides pin-compatible replacement capability, maintaining identical polarization, cabling, and electrical specifications for existing installations.
