The F-P (Fabry-Pérot) etalon is a high-resolution spectroscopic instrument because of its high flat reflectivity and extremely narrow multi-beam isotropic interference fringes. It can be used for high-resolution spectroscopy and the study of spectral lines with very close wavelengths, such as isotope spectra of elements, ultrafine structures of spectra, tiny frequency shifts during light scattering, Doppler shifts of spectral lines caused by atomic movement, and the structural shape inside spectral lines; it can also be used as a high-resolution optical filter and to construct a precision wavelength meter; in laser systems, it is often used to narrow spectral lines within the cavity or to make the laser system run in single mode, and can be used as a bandwidth control and tuning device in broadband picosecond lasers to analyze and detect spectral (longitudinal mode, transverse mode) components in lasers.

Technical Parameter

Experiment Test

Test Steps:

1. Install the 1532nm laser, connect the power supply and USB cable.

2. Laser output connected to a fibre collimator.

3. Connect the signal generator to the low-frequency modulation port of the laser driver with a BNC-to -BNC cable.

4. Connect the detector to the channel 2 port of the oscilloscope with a BNC-to-BNC cable.

5. Turn on the laser and the signal generator (triangle wave modulation, frequency 1KHZ, voltage amplitude 500mW).

6. The light emitted by the laser passes through the etalon and hits the photosensitive surface of the detector. By adjusting the angle of the etalon, the modulation waveform can be viewed on the oscilloscope.

Test Results: