Laser Frequency Splitting and Mode Competition Educational System

Knowledge Points Involved:
Frequency splitting, mode competition, laser resonator, laser longitudinal mode, laser polarization state.F-P Coaxial Spherical Scanner, Laser Operating Current.

 
Frequency Splitting and Mode Competition System Architecture Diagram

Courses Involved:
Optics, laser principles, optoelectronics, laser technology, laser optics, engineering optics, photoelectric detection, etc.
Experiment Content:
Adjust half-cavity laser using cross-threading method.
The relationship between different laser resonator types and laser output power.
Laser diode operating current
Learn about the F-P confocal spherical scanner interferometer, free spectral range.
Measure the longitudinal mode spacing of the laser and understand the impact of different cavity lengths on the laser's longitudinal mode spacing.
Measure quartz angle—frequency splitting curve
Measure stress-frequency splitting curve
Observation of laser mode competition phenomena
Calculate measurement laser beam width.
Research on Laser Output Characteristics.
Experimental Principle Diagram

Illustration of Experimental System Structure for Laser Frequency Splitting and Mode Competition(M2 is the output mirror, Q is the quartz plate, PZT is piezoelectric ceramic)

Experimental Effect Illustration:

Dual Transverse Modulation Output Dual Transverse Modulation Frequency Split Output

Technical Specifications:
Laser Diode HeNe Laser: central wavelength 632.8nm; laser output power >1mW, laser tube length 250mm; laser cavity length approximately 360mm, dual longitudinal mode output.
Laser Power Supply: Provides power for lasers up to 150~450mm in length, with adjustable working current from 0-6mA; this particular laser operates at 5.5mA.
Cross-tie assembly with anodized aluminum surface for non-reflective finish, featuring a φ1mm hole at the center of the cross like a bullseye, 0.5W, 220VAC powered LED light.
F-P Coherent Scanner Interferometer: Operating Wavelength 632.8nm; Free Spectral Range 2.5GHz; Sawtooth Wave Amplitude 0~300VDC
Piezoelectric ceramic drive power supply voltage: 0-400V DC, manually adjustable.
Polarizer (with rotatable frame), φ12.7mm, AR @ 400-700nm, extinction ratio 500:1, end face 360°, angular graduation lines.
Instrument suite completeness:
HeNe external-cavity laser module, laser power supply, quartz crystal component, stress glass component (optional), scanning interferometer, scanning interferometer power supply, polarizer component.
Essential Equipment:
Oscilloscope (dual channel,)1Gs/s，100MHz）。
Usage Instructions:
System power on/off and specific installation, adjustment, and wiring methods, please refer to the operation manual of this system.
Suggested Class Hours:
2 hours.