Laser Power Adjustment
Laser Power Adjustment - Related Videos
03:55
Inducing Targeted Neuronal Injury Using a High-Power Laser in a Drosophila Larva
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2025
This video demonstrates a method for inducing targeted neuronal injury in Drosophila larvae using a high-power laser. After positioning the larva under a microscope, a low-power laser scans for fluorescent neurons, and then the laser power is increased to induce localized damage. The injury is confirmed by increased fluorescence and a crater at the injury site.
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.
01:25
The Anchoring-and-Adjustment Heuristic
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2020
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
01:12
Adjusting a Traverse
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2025
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
01:27
Adjusting Entries
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2025
In accounting, a business's economic activities are segmented into designated time intervals, typically monthly, quarterly, or annually, known as accounting periods. This segmentation facilitates consistent tracking, summarization, and reporting of financial data, enabling stakeholders to accurately evaluate a company's performance and financial position. Companies must incorporate adjusting entries at the close of each period to ensure that financial reports conform to the accrual basis of...
FAQs
Drive current changes the laser’s optical output at its source, whereas optical attenuation reduces the light before it reaches the sample. Both approaches can alter irradiance, the light intensity at the experimental target, and therefore photon flux. Selecting between them allows researchers to control stimulation or measurement conditions while maintaining a defined light level.
Photon flux determines how many photons reach the sample and therefore influences the strength of light-dependent neural stimulation or fluorescence measurements. Controlling this quantity helps researchers relate observed neural responses to stimulus intensity rather than to uncontrolled variation in illumination. It also provides a basis for comparing results across preparations and experimental sessions.
Reducing unnecessary optical output lowers the amount of light delivered to the sample, which helps limit heating and photodamage during light-based experiments. The appropriate setting balances sufficient illumination for optogenetic stimulation or fluorescence imaging with restraint in photon delivery. This balance supports usable measurements while reducing light-related effects that could compromise the preparation.
Calibration establishes a consistent relationship between the selected laser setting and the light reaching the sample. Without that control, similar nominal settings may not produce comparable experimental illumination, making neural responses harder to interpret. Consistent power adjustment strengthens comparisons across animals, preparations, and imaging sessions by helping ensure that stimulus intensity remains comparable.
A basic workflow sets the laser output through drive current or optical attenuation, then establishes the intended light level at the sample for the planned experiment. Researchers choose a setting appropriate for the task, while considering photon delivery, heating, and photodamage. Maintaining that calibrated condition during data collection supports reproducible stimulation or measurement.
It is especially useful when researchers need reproducible activation or inhibition of opsin-expressing neurons. Adjusting the delivered light changes the stimulus intensity and helps relate the resulting neural response to that intensity. Controlled settings also make optogenetic outcomes more comparable across animals and preparations, rather than allowing differences in illumination to confound interpretation.
For fluorescence imaging and related measurements, controlled illumination helps maintain a consistent photon supply to the sample. This supports comparisons among imaging sessions and helps researchers distinguish changes in measured fluorescence or neural activity from changes caused by illumination. Limiting excess output also addresses heating and photodamage while preserving the light needed for measurement.