How Does CCD Offset Affect Laser Beam Exit Angle?

In summary, the conversation discusses measuring laser pointing stability using a focusing lens and a CCD. The relationship between the offset from focal point in the CCD and the angle with which the beam exits the laser depends on the setup, with no offset if the laser source and CCD are both in focus. The software fits a gaussian to the image of the beam and determines the central coordinates, which can be affected by the laser's instability. The angle from the source can be related to the offset in μradians. It is also mentioned that the focus of the camera should be set to infinity for accurate measurements. Additional information about pointing stability can be found at the provided link.
  • #1
_Matt87_
15
0
hi,
I'm measuring my laser pointing stability with a focusing lens and a CCD.
Could you guys tell me what would the relationship be between the offset from focal point in CCD and the angle with which the beam exits the laser?

CCD is in focus.
 

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  • #2
That depends on your setup. If the laser source is in the focus (as well as the CCD), there is no offset at all - that is the idea of the focus,
 
  • #3
light source is about 2 meters from the ccd with a lens 10cm before the camera (100 mm f).
software fits a gaussian to an image of the beam and tells me the central coordinates. Now I see that the laser is unstable in a way that the centrum of the Gaussian moves up and down in the focal plane, meaning that the beam hits the lens sometimes higher/lower than the middle. I'm trying to relate the angle from the source to that offset (see the attachment) in μradians.
 
  • #4
Okay, so focus of the camera is basically set to infinity. Then the vertical position of the laser does not matter (in an ideal camera) and you can consider rays going through the center of the lens. The displacement is just sin(angle)*focal length.
 

1. What is laser pointing stability?

Laser pointing stability refers to the ability of a laser beam to maintain its direction and position over time. This is an important factor in laser applications that require precise targeting, such as in scientific experiments or industrial processes.

2. How is laser pointing stability measured?

Laser pointing stability is typically measured in terms of the beam's stability over time, as well as its divergence and jitter (random fluctuations). These measurements can be taken using specialized equipment such as a laser power meter, beam profiler, or position sensitive detector.

3. What factors can affect laser pointing stability?

There are several factors that can impact laser pointing stability, including temperature changes, power fluctuations, and mechanical vibrations. The quality and alignment of the laser components, such as mirrors and lenses, can also play a role.

4. How can laser pointing stability be improved?

To improve laser pointing stability, it is important to use high-quality components and ensure proper alignment. Controlling environmental factors, such as temperature and vibrations, can also help. In some cases, active stabilization systems can be used to compensate for any fluctuations.

5. Why is laser pointing stability important in scientific research?

In scientific research, laser pointing stability is crucial for accurate and repeatable experiments. It allows researchers to precisely target their desired location and minimize any potential errors or variations in their data. Without stable laser pointing, the results of experiments can be inconsistent or unreliable.

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