He-Ne laser and laser resonance
Experiment contents and related subjects:
Using semiconductor laser as the collimation light source and self-collimation method to adjust a semi-internal cavity He-Ne laser to meet the staring conditions for oscillation and so as to produce laser.
By moving the reflecting mirror on the guide to change the resonant cavity length. the relationship between cavity length and the transverse mode, longitudinal mode (with F-P scanning interferometer), power can be observed and, at the same time, the effect on waist diameter and divergence angle can also be observed. The working principle of laser and laser resonate theory can be understand and grasped.
Measure the gain of the laser by inserting an adjustable loss in the cavity.
Features of instrument:
All hard sealed semi-internal cavity He-Ne laser has a very long storage life and service life.
The semiconductor laser is 650nm, 4mW; the laser power meter is 3 and a half digital meter whose range are 200μW, 2mW, 20mW,200 mW and tunable range respectively.
Stabilized current laser power supply whose current range is 4-7mA.
Laser beam analyzer which can observe the spot intensity distribution, measure spot diameter and divergence angle, etc. (optional).
Complete set of equipment:
Optical experiment guide ,semiconductor laser, semi-internal cavity He-Ne laser, beam expander mirror ,two-dimensional adjustable mold piece frame ,laser power indicator ,gain measuring annex F-P scanning interferometer(optional) laser beam analysis.