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1. Main stage 2. Side stage 3. Light source 4. Beam expander 5. Transparent slice clamp 6. Ground glass screen 7. Rotational pointer and SOCKET 3 8. Fixed mirror (also as a F-P mirror) 9. Presetting micrometer 10. Fine micrometer 11. Movable mirror 12. Stage for mounting items 6 or 8 13. Compensator 14. Beam splitter 15. Extension arm 16. Two-in-one screen 17. SOCKET 2 for mounting item 4
Fringe image acquired by color camera |
Features
Three Modes
Stable Base for Precise Measurement
Compact and Lightweight
He-Ne Laser, Sodium-Tungsten Lamp, and Air Chamber Included
Optional VGA Video Camera for Fringe Image Display and Projection
Introduction
This equipment combines the historically important Michelson interferometer, the high resolution Fabry-Perot interferometer, and the useful Twyman-Green interferometer in one unit. Michelson interferometer is still an important instrument in today's physics laboratories and is used for observing two-beam interference phenomena. Fabry-Perot interferometer is for observing multiple-beam interference and measuring the fine structure of spectrum. Twyman-Green interferometer is used to measure the defects in optical components such as lenses, prisms, and windows etc.
Measurements are precise in three classical modes of operation. Switching between the three modes of operation and aligning components are very simple, as this complete set of high quality components is carefully mounted on a heavy, stable base. Using an optional color camera, interference fringes can be displayed on a VGA monitor or sent to a projector for real-time lecture demonstration.
The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.
Using this instrument, the following experiment examples can be conducted:
1. Two-beam Interference observation
2. Equal-inclination fringe observation
3. Equal-thickness fringe observation
4. White-light fringe observation
5. Wavelength measurement of the Sodium D-lines
6. Wavelength separation measurement of the Sodium D-lines
7. Measurement of the refractive index of air
8. Measurement of the refractive index of a transparent slice
9. Multi-beam interference observation
10. Measurement of the He-Ne laser wavelength
11. Interference fringe observation of the Sodium D-lines
12. Demonstrating the principle of a Twyman-Green interferometer
13. Interference fringe acquisition by color camera for VGA display or projector (optional)
Specifications
| Description | Specifications |
| Flatness of Beam Splitter and Compensator | 0.1 λ |
| Coarse Travel of Mirror | 10 mm |
| Fine Travel of Mirror | 0.625 mm |
| Fine Travel Resolution | 0.25 μm |
| Fabry-Perot Mirrors | 30 mm (dia), R=95% |
| Wavelength Measurement Accuracy | Relative error: 2% for 100 fringes |
| Sodium-Tungsten Lamp | Sodium lamp: 20 W; Tungsten lamp: 30 W adjustable |
| He-Ne Laser | Power: >2.5 mW; Wavelength: 632.8 nm |
| Air Chamber, Pump with Gauge | Chamber length: 80 mm; Pressure range: 0-40 kPa |
Camera with VGA Port (Optional) | Sensor size: 1/4" |
| Resolution: 1280 × 1024 | |
| Pixel size: 2.8 μm × 2.8 μm | |
| Bit: 8 | |
| Output format: VGA | |
| Length measurement on screen with crosshairs | |
| Function setting & operation: via keypad and menu |
Part List
| Description | Qty |
| Interferometer Main Frame | 1 |
| Ground Glass Screen | 1 |
| Holder for Beam Expander | 1 |
| Extension Arm | 1 |
| Two-in-One Observation Screen | 1 |
| Transparent Slice Specimens | 2 |
| Transparent Slice Clamp | 1 |
| Sodium-Tungsten Lamp with Power Supply | 1 set |
| He-Ne Laser with Power Supply | 1 set |
| Air Chamber with Gauge | 1 set |
| Manual Counter | 1 |
| CMOS VGA Camera with Mount & Keypad (Optional) | 1 set |
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1. Main stage 2. Side stage 3. Light source 4. Beam expander 5. Transparent slice clamp 6. Ground glass screen 7. Rotational pointer and SOCKET 3 8. Fixed mirror (also as a F-P mirror) 9. Presetting micrometer 10. Fine micrometer 11. Movable mirror 12. Stage for mounting items 6 or 8 13. Compensator 14. Beam splitter 15. Extension arm 16. Two-in-one screen 17. SOCKET 2 for mounting item 4
Fringe image acquired by color camera |
