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Technical Article

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How to find lost Trap 2

 

Abstract

This guide details how to recover Trap 2 in the C-Trap system when it is out of the field of view. It uses Z-finder camera focus, joystick movement, and step-size adjustments to locate and center the trap based on the back reflections. The same protocol can also be used to get Trap 3 or 4 back to the field of view. Keywords: Trap 2, lost trap, C-Trap, Z-finder, back reflection, trap recovery, step size, joystick control

If Trap 2 is lost from the field of view, follow the steps below to bring it back using the Z-Finder camera in Bluelake. You’ll be looking for the second back reflection to help you re-locate the trap.
Tip:
If Trap 2 appears at any point, you can skip the remaining steps and reposition it directly.

1. Open the Z-Finder and Adjust the Objective

  • Go to the Z-Finder camera tab in Bluelake.
  • Using the objective micrometer, move the objective downward, toward the first back reflection, until the back reflection is clearly visible.
  • Adjust the height until you can see wide interference rings, these make Trap 2 easier to spot.

2. Check Initial System Settings

  • Confirm that the Trap 1 split is set to 50%.
  • Make sure that Trap 1+2 XY position is centered at (0, 0).
Z-finder tab in Bluelake

3. Move Trap 2 to the Right Limit

  • Select Trap 2.
  • Use the joystick to move it all the way to the right.
  • Stop when the clicking noise stops. This indicates the trap has reached its limit.

4. Move Trap 2 to the Left Limit with Large Step Size

  • In the Trap movement box (red box), enter a large step size, such as 10,000 nm (10 µm).
  • While counting the clicks, click the left arrow to move Trap 2 all the way to the left limit.
  • Stop when the clicking noise ceases (you’ve reached the end). This will require many clicks.
Step size in Bluelake
Left arrow to move Trap 2

5. Center Trap 2 in X

  • Divide the total number of clicks it took to go from right to left by 2.
  • Move that many steps back to the right, to position Trap 2 roughly at the center of its X-range.
  • Lock the X-direction.

You might already see the second back reflection at this point. If so, skip ahead to adjust the objective and center visually.

6. Move Trap 2 to the Upper Y Limit

  • Use the joystick to move Trap 2 upward until the clicking stops.

7. Move Trap 2 to the Lower Y Limit

  • Use the large step size from earlier.
  • While counting clicks, click the down arrow until Trap 2 reaches the bottom (no more clicking).
Bottom arrow to move Trap 2 downward

8. Center Trap 2 in Y

  • Divide the number of clicks by 2.
  • Move that many steps back up, centering Trap 2 in the Y-direction.

9. Final Adjustments in the Z-Finder

  • Trap 2 should now be close to its central position and visible in the Z-Finder.
  • If the rings are not visible:
    • Slightly raise the objective to widen the back reflections.
    • Move Trap 2 around gently until you locate the reflection.