The EG&G Model 460-1 Laser Power Meter is a vintage, portable device used to directly measure the average power of various gas, diode, and dye lasers, often paired with a silicon (like the 460-2) or thermopile detector for different wavelengths and power ranges, functioning by converting light into electrical signals that are then displayed as wattage, providing crucial feedback for laser system diagnostics and performance monitoring, especially for pulsed or continuous wave (CW) lasers. 

Key Features & Functionality:

• Direct Reading: Displays power in watts, suitable for pulsed (low or repetitive) and continuous wave (CW) lasers.
• Detector Dependent: Uses various sensors (e.g., silicon, thermopile) to capture light, with different detectors for specific power levels and spectral ranges.
• Portability: Designed as a compact, handheld unit for field or lab use.
• Versatility: Capable of measuring a broad spectrum of lasers, from low-power pointers to higher-power systems, depending on the detector used. 

How it Works (General Principle):

1. Absorption: The laser beam hits a detector (like a photodiode or thermopile).
2. Signal Generation: The detector converts the light energy into an electrical signal (current or heat).
3. Processing: Internal electronics amplify and process this signal.
4. Display: The meter translates the electrical signal into a direct power reading in watts. 

Typical Usage:

• Calibration & Testing: Verify laser output power.
• Troubleshooting: Diagnose issues in laser systems, like engravers.
• Performance Monitoring: Ensure lasers meet specified power levels