Laser Alignment Protocol
Laser Alignment Protocol - Related Videos
07:12
Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment
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Cited by 3 •
2022
This protocol demonstrates the use of a microfluidic channel with changing geometry along the fluid flow direction to generate extensional strain (stretching) to align fibers in a 3D collagen hydrogel (<250 µm in thickness). The resulting alignment extends across several millimeters and is influenced by the extensional strain rate.
09:43
Improved Protocol For Laser Microdissection Of Human Pancreatic Islets From Surgical Specimens
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Cited by 25 •
2013
Laser microdissection is a technique that allows the recovery of selected cells from minute amounts of parenchyma. Here we describe a protocol for acquiring human pancreatic islets from surgical specimens to be used for transcriptomic studies. Our protocol improves the intrinsic autofluorescence of human beta cells, thus facilitating their collection.
07:35
Laser Microdissection-Based Protocol for the LC-MS/MS Analysis of the Proteomic Profile of Neuromelanin Granules
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Cited by 4 •
2021
A robust protocol is presented here for isolating neuromelanin granules from human post-mortem substantia nigra pars compacta tissue via laser microdissection. This revised and optimized protocol massively minimizes the required time for sample collection, reduces the required sample amount, and enhances the identification and quantification of proteins by LC-MS/MS analysis.
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Cited by 2 •
2016
A protocol to detect and automate mode locking in a pre-adjusted nonlinear polarization rotation fiber laser is presented. The detection of a sudden change in the output polarization state when mode locking occurs is used to command the alignment of an intra-cavity polarization controller in order to find mode-locking conditions.
11:36
Assembly, Loading, and Alignment of an Analytical Ultracentrifuge Sample Cell
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Cited by 21 •
2009
The analytical ultracentrifuge (AUC) sample cell holds sample and reference buffer and during experiments and is exposed to high vacuum and rotor speeds up to 60,000 rpm. This video will demonstrate the rigorous attention to detail necessary for assembly, loading and alignment of this very important component of an AUC experiment.
FAQs
A low-power alignment beam provides a safer reference for checking beam position before the full optical system is operated. It can be observed at reference apertures, irises, or detectors while mirrors, lenses, and mounts are adjusted. This approach helps establish the intended path and reduces exposure to hazardous laser radiation during initial positioning.
Reference apertures and irises provide fixed geometric checkpoints along the optical path. Centering the beam through these points helps verify that its direction remains consistent between components rather than merely appearing correct at one location. Their use supports accurate beam positioning and helps maintain the geometry required for stable measurements in complex optical systems.
Each component contributes differently to the beam geometry. Mirror adjustments redirect the beam, while lens positioning affects how the beam proceeds through the optical system; mounts provide controlled mechanical positioning for these elements. Coordinated adjustments are necessary because changing one component can alter the beam position or direction at later reference points and detectors.
Stable alignment preserves the beam geometry while an experiment operates or measurements are repeated. If the path changes, signal strength can decrease and optical aberrations or drift can affect the recorded result. Maintaining the intended positioning therefore improves repeatability and helps ensure that observed changes arise from the experiment rather than inconsistent beam alignment.
A typical procedure begins with a low-power alignment beam and establishes reference positions using apertures or irises. Operators then make controlled adjustments to mirrors, lenses, and mounts so the beam follows the intended path, checking its position with reference points or detectors. The system is subsequently assessed for centering, direction, stability, and safe operation.
Interferometers, spectroscopy systems, and imaging instruments all depend on suitable beam geometry, although the alignment requirements differ with the measurement. In each case, careful positioning can improve signal strength, reduce optical aberrations and drift, and support repeatable results. The protocol is therefore relevant wherever beam direction and component placement influence the quality of optical data.