The use of diffraction grating and matters needing attention

• Fixed grating: The diffraction grating is mounted on a stable stand or optical table, ensuring that the surface of the grating is perpendicular to the incident beam.
• Incident Angle: The Angle of the incident beam is adjusted so that it forms an appropriate incidence Angle with the grating surface, usually the incidence Angle should match the grating constant and the desired diffraction order.

• Light source selection: Select the appropriate light source, and determine the wavelength range and intensity of the light source according to the experimental requirements.
• Light path alignment: Use optical elements (such as lenses, mirrors) to collimate the beam and ensure that the beam is vertically incident on the grating.

• Detector positioning: a detector (such as a photodetector, CCD camera) is arranged on the diffraction optical path of the diffraction grating to collect light signals from different diffraction angles.
• Spectral analysis: By changing the position of the detector or rotating the grating, the diffractive light signal of different wavelengths is recorded for spectral analysis.

• Clean environment: Ensure that the use of the environment is clean, to avoid dust and impurities attached to the surface of the grating, affecting the diffraction effect.
• Stable temperature: Keep the temperature of the use environment stable to avoid the thermal expansion of the grating material and the change of the grating constant caused by the temperature change.

• Prevent damage: Avoid direct contact with the surface of the grating with your hands, and use dust-free gloves or special tools for operation to prevent surface scratches and contamination.
• Storage: When not in use, the grating is stored in a special protective box to avoid contact with hard objects and vibration.

• Precise adjustment: When adjusting the incidence Angle of the grating and the detector position, it should be precisely controlled and adjusted using a precise adjustment mechanism (such as a fine tuning platform).
• Calibration: Before taking spectral measurements, the system should be calibrated to ensure the accuracy of the measurement results.

• Data recording: In the measurement process, the diffraction Angle and light intensity data are recorded in time, and the accuracy and efficiency of data recording are improved by using computers and data acquisition systems.
• Analysis method: Select the appropriate data analysis method according to the experimental requirements, and carry out spectral analysis or other optical measurement.

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