Observation and Measurement of Laser Modes with F-P Scanning Interferometer

Knowledge Introduction

    Laser mode is a very important index to measure the laser characteristic, is an effective way to understand laser and comprehend the theory of laser. Besides, in different fields, the laser requirements are also different, such as laser fine processing requires interferometric measurements need single longitudinal mode laser.

       In the experiment, laser longitudinal mode is analyzed with a F-P scanning interferometer, such as longitudinal mode observation (Single longitudinal mode, Multi-longitudinal mode, mode competition), line width of longitudinal mode measurement, frequency interval of longitudinal mode measurement etc. The students can understand the structure and principle of F-P scanning interferometer, grasp how to use it and comprehend the abstract concepts above by the experiment.

Experiment Device

       Main points:

       a) Longitudinal mode of standing wave cavity generation mechanism

       b) Analysis of longitudinal mode (Single longitudinal mode, Multi-longitudinal mode, mode competition)

       c) Structure and operational principle of scanning interferometer

       d) Line width and frequency space of longitudinal mode measurement and calculation

Single longitudinal mode

Multi-longitudinal mode

·Line width of laser spectrum measurement

·Fine-structure constant of interferometer measurement

·Free spectral range of interferometer measurement

·Resolution of interferometer measurement

·Laser spectrum measurement with high resolution

·Laser mode detection and control

·Longitudinal mode laser production and detection

·Analysis of laser light noise generation mechanism