Measurement & Safety
FPSI 200-532
Longitudinal Mode Measurement
Resolve the fine spectral structure of a continuous laser with a scanning confocal Fabry-Perot interferometer. The system combines an optical cavity, photodiode detector and piezoelectric scan controller.
How the measurement works
A sawtooth voltage changes the mirror separation. The photodiode records transmitted resonances as the cavity scans, revealing single- or multiple-longitudinal-mode structure.
Features
- Confocal Fabry-Perot layout
- Photodiode detector included
- Mirror reflectance above 99% across the listed band
- Adjustable high-voltage scan amplitude and duty cycle
Applications
- Single-frequency laser assessment
- Longitudinal-mode structure
- Interferometry and narrow-line laser experiments
Technical specifications
Interferometer
| Parameter | Specification |
|---|---|
| Model | FPSI 200-532 |
| Wavelength range | 532-633 nm; other wavelengths customised |
| Free spectral range | 2.5 GHz |
| Total finesse | ≥200 |
| Resolution | <12.5 MHz |
| Cavity length | 30 mm |
| Mirror substrate | UV fused silica |
Scan controller
| Parameter | Specification |
|---|---|
| Waveform | Sawtooth |
| Output voltage | 0-200 V |
| Listed scan-period settings | 0.05 / 0.1 / 0.5 / 1 / 5 s |
Configure your measurement
Include these details with your enquiry so we can match the instrument and accessories.
- Laser wavelength and expected linewidth/mode spacing
- Input power, beam alignment and detector readout
- Required scan period and high-voltage control