Description
Atomfair MI-FPI 516 Interferometer
Product Overview
The Atomfair MI-FPI 516 is a high-precision optical instrument integrating Michelson interferometry and Fabry-Perot interferometry functions. Developed and manufactured by the Chinese brand ZKGD, with its origin in Tianjin and the manufacturer being a general distributor, this instrument is specialized in experiments and measurement applications related to interference, diffraction, and polarization. It is particularly suitable for physical optics experimental teaching in institutions of higher education. Its core advantage lies in the seamless switching between the two interferometer functions—no need to disassemble any components; only moving the light source and beam expander, and changing the observation direction are required to complete the switch.
Product Applications & Experimental Contents
Core Applications
With Michelson interferometry structure: Observe various interference phenomena such as equal-inclination interference, equal-thickness interference, and white light interference; achieve precise wavelength comparison and zero-path difference determination; measure the thickness of transparent medium sheets, coating thickness, and air refractive index.
With Fabry-Perot interferometry structure: Observe multi-beam interference phenomena (e.g., multi-beam interference sharp rings); observe the fine structure of spectral lines; measure the wavelength difference between adjacent spectral lines.
Specific Experimental Contents
Interference Phenomenon Observation: Observe equal-inclination interference, equal-thickness interference, and white light interference (sodium-tungsten dual lamp is required as an optional accessory).
Optical Parameter Measurement: Measure monochromatic light wavelength, thickness of transparent medium sheets, coating thickness, and air refractive index (air chamber, barometer, and gauge head are required as optional accessories).
Multi-beam Interference Experiment: Utilize the Fabry-Perot interferometry device to observe multi-beam interference sharp rings, measure the wavelength difference between adjacent spectral lines, and observe the fine structure of spectral lines.
Product Structure & Working Principle
Overall Structure
The instrument adopts a platform-type base design with a thick steel plate tabletop to ensure stable operation. The base integrates the core components of the two interferometers, including: He-Ne laser, side plate, beam expander (two-dimensionally adjustable and movable on a double-bar guide rail), fixed mirror (Michelson interferometer reference mirror), beam splitter (with semi-transparent film plated on the inner side), compensation plate (consistent with the beam splitter in material and thickness, adjusted to a parallel state before leaving the factory), F-P fixed mirror and F-P movable mirror, rotating arm frame, movable mirror preset screw, movable mirror, micrometer screw, movable mirror carriage, ground glass screen (receives Michelson fringes and prevents glare), pressure gauge base, etc. The transmission components are divided into upper and lower layers. The upper layer includes the F-P movable mirror, movable mirror preset screw, Michelson movable mirror, and movable mirror carriage, which facilitates presetting the movable mirror and is controlled by the lower micrometer mechanism.
Working Principle
Michelson Interferometer: The light beam emitted by the light source is directed to the beam splitter, which splits it into two paths through reflection and transmission—one path is reflected back by the fixed mirror, and the other path passes through the compensation plate and is reflected back along the original path by the movable mirror. The two light beams converge and interfere at the beam splitter, and the observer can see the interference pattern from a specific direction. The virtual image of the movable mirror and the fixed mirror form an “air parallel plate”. The interference effect is determined by the distance between the two mirror surfaces and the incident angle of the light. When specific conditions are met, concentric circular interference fringes will be formed.
Fabry-Perot Interferometer: Based on the principle of multi-beam superposition of monochromatic light reflected by parallel plane plates (F-P fixed mirror and F-P movable mirror), it produces narrow and bright interference fringes. Adjusting the distance between the two mirror surfaces allows observing different multi-beam interference effects, and spectral-related parameters can be measured through the characteristics of the fringes.
Configuration & Technical Parameters
Standard Configuration & Parameters
Configuration Name Specification Parameters Quantity
Interferometer Host Wavelength measurement accuracy: Relative error ≤2% when the fringe count is 100; Flatness of beam splitter and compensation plate: ≤1/20λ; Micrometer screw: Each small grid corresponds to a movable mirror movement of 0.0005mm, and each rotation of 0.01mm results in a movable mirror movement of 0.0005mm; Movable mirror stroke: Coarse adjustment (preset) 10mm, Fine adjustment (micrometer) 1.25mm; Overall dimensions: 450×340×250mm; Weight: Approximately 17kg (excluding light source) 1 Unit
Laser & Bracket He-Ne laser, Power: 0.7-1mW, Wavelength: 632.8nm, Including power supply 1 Set
Other Accessories Ground glass screen 1 Set
Note: The above configurations and parameters are for reference only. The final configuration shall be subject to the product packing list. No separate notice will be given for minor changes.
Optional Configurations
Optional Accessory Name Specification Parameters Quantity
Sodium-Tungsten Dual Lamp Sodium lamp power: 20W; Tungsten bromide lamp power: 15W, Voltage: 6V/3V 1 Set
Air Chamber Length: 80mm, Used for air refractive index measurement 1 Set
If you’re interested, have any questions, or have specific customization requirements, please feel free to contact us at inquiry@atomfair.com.
