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Product Name：He-Ne Laser Apparatus
Product Type：Laser Principles
Product Model：BEX-8201
Brands：Brolight
Applications：E-learning Products
Introduction
He-Ne lasers have many industrial and scientific uses. They are widely used because of relatively lower price and easier to operate compared to other visible lasers producing beams of similar quality in terms of spatial coherence. This apparatus is designed to help students to learn laser‘s structure and basic theory.

Features
• Open structure help students to understand laser easily.
• Optimized structure design to enable students to focus the cavity‘s adjustment, making the laser output experiment easy and effective.
• High resolution F-P confocal resonator scanning interferometer is used to get clear frequency spectrum of mode.

Objectives of the Experiment
• To understand the basic principle and structure of laser
• To understand the basic of resonant cavity
• To understand mode theory and measure longitudinal mode for different length of resonant cavity
• To test the polarization of laser

How it works
• When the optical axis and parallelism of main laser, flat concave mirror and flat mirror are adjusted well, the laser will oscillate and lase. When the cavity is optimized, the output power is maximum. By moving the optical carrier to change the length of the resonant cavity, different output power can be measured.

• The longitudinal mode spacing is determined by the length of resonant cavity. The F-P confocal resonator scanning interferometer and oscillograph are used to measure it.

• In this kit, the main laser has two Brewster window, so the output of the laser is linearly polarized. It can be test by polarizing filter and Malus law.
Degrees
cos2θ
Normalized Power
0°
1.000
1
10°
0.970
0.985
20°
0.883
0.874
30°
0.750
0.748
40°
0.587
0.572
50°
0.413
0.396
60°
0.250
0.243
70°
0.117
0.104
80°
0.030
0.024
90°
0.000
0.001


Order Information

Description Model# Qty.
Track,with Strong Base, L1000mm BEM-5201-10 1
Optical Carrier, W30mm BEM-5204-30 5
Precision Kinematic Optical Mount, Φ45mm,2D BEM-5203 5
F-P Confocal Resonator Scanning Interferometer,Δν=1.5GHz BEM-5024 1
Sawtooth Wave Generator BEM-5020 1
Pilot Laser with Power Supply, 1800V,max 5mA, <5mW, Singlemode BEM-5025 1
Sheath Protection Main Laser with Power Supply, 2500V,max 8mA, <5mW, Multimode BEM-5026 1
Polarizing Filter BEM-5404 1
Flat-concave Mirror, R=1000mm BEM-5406 1
Flat Mirror BEM-5407 1
Laser Base BEM-5212 2
Laser Goggles BEM-5801 1
Optical Power Meter BIM-7001 1
Optical Silicon Detector, 380nm~1100nm, 100pw~10mw BIM-7101 1
Fixed Mount, Φ45 BEM-5220 1
Diaphragm, Φ5 BEM-5221-05 1

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