Q-switched Laser
Q-switched Laser - Related Videos
01:22
Switching of BJT
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2024
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch. Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
09:49
Induction and Assessment of Class Switch Recombination in Purified Murine B Cells
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Cited by 7 •
2010
Following antigen exposure, subpopulations of activated B cells undergo a process known as class switch recombination (CSR) to produce antibody isotypes with distinct effector functions. The protocol outlined in this report explains how CSR can be induced and analyzed in vitro for the purposes of studying B cell function.
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.
09:14
An In Vitro System to Study Tumor Dormancy and the Switch to Metastatic Growth
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Cited by 39 •
2011
A modified 3-D in vitro system is presented in which growth characteristics of several tumor cell lines in reconstituted basement membrane correlate with the dormant or proliferative behavior of the tumor cells at a metastatic secondary site in vivo.
07:00
Measuring the Switch Cost of Smartphone Use While Walking
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2020
This study design measures the task-switching cost of using a smartphone while walking. Participants undergo two experimental conditions: a control condition (walking) and a multitasking condition (texting while walking). Participants switch between these tasks and a direction determining task. EEG data as well as behavioral measures are recorded.
FAQs
The Q-switch first keeps the cavity from lasing while the gain medium accumulates optical energy. When the switch rapidly opens the cavity, the stored energy exits in a nanosecond pulse rather than being released gradually. This timing concentrates the available energy into a brief event, enabling high-intensity interaction with the targeted material or tissue.
Their short duration and high intensity produce strong photothermal and photoacoustic effects. Photothermal effects support localized thermal interaction, while photoacoustic effects provide a basis for imaging and analysis. In infection research, this combination allows investigators to examine pigments, biomaterials, and biological structures while limiting energy exposure to nearby material.
Photothermal and photoacoustic effects serve different analytical purposes. Photothermal effects describe energy producing thermal changes in the target, supporting precise tissue or material interaction. Photoacoustic effects are especially relevant when the goal is imaging. Distinguishing these outcomes helps investigators emphasize selective disruption, structural analysis, or visualization in an immunology or infection study.
Its nanosecond, high-intensity pulses can generate photoacoustic effects in biological targets, creating a basis for visualizing inflamed or infected tissues. This approach is relevant when researchers need to assess tissue regions while keeping exposure to surrounding material limited. It connects pulse-controlled optical delivery with imaging questions in immunology and infection research.
The technique can be applied to pigments, biomaterials, biological structures, and pathogen-associated components. These targets support several kinds of investigation, including material characterization, selective disruption, structural analysis, and examination of components associated with infection. The range of targets makes the method relevant to both tissue-focused studies and research on infection-related materials.
Within immunology and infection research, the method links physical characterization to biological questions. Investigators can characterize pigments and biomaterials, selectively disrupt or analyze biological structures, and investigate pathogen-associated components. These uses extend beyond image formation, allowing pulse-driven optical interactions to support studies of infected tissues and the materials or structures associated with infection.