Mode-locked femtosecond laser pulses (center wavelength of 800 nm and a full-width half maximum of 10 nm) are emitted from a Ti:sapphire crystal in an optical cavity (Spectra Physics, Tsunami). The laser is collimated and a linearly polarized TEM00 mode beam. The time interval between pulses is 12.4 ns (80.7 MHz), and the pulse duration is ~94 fs. The power of the laser is fixed to 690 mW. The femtosecond laser passes through a 20× objective lens and focuses on the NP-water suspension in the cuvette. A beam profiler (Thorlab BP104-UV) measures the minimum waist of the Gaussian beam (~6 μm). We note ballistic movements were still observed with a 10× objective lens (Supplementary Video 2 ) or a laser power as high as ~1 W. The scattered lights from the Au NPs passes through another objective lens and focuses on the image sensors of the high-speed camera (HX-7, NAC). The recorded images in the camera are then analyzed using a customized image processing software in MATLAB.
Optical cavity
Manufactured by Spectra-Physics
An optical cavity is a device that confines and amplifies light through the use of two or more mirrors. It consists of a pair of highly reflective mirrors that allow light to oscillate back and forth, creating a resonant condition. The optical cavity's core function is to provide a means for light to be trapped and amplified, enabling various applications in fields such as lasers, spectroscopy, and optical sensing.
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Lab products found in correlation
2 protocols using optical cavity
1
Ultrafast Optical Imaging of Nanoparticle Dynamics
2
Femtosecond Pulsed Laser Setup
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Pulsed laser: The mode-locked monochromatic femtosecond pulsed laser we used in our experiments is emitted from a Ti:Sapphire crystal in an optical cavity (Spectra Physics, Tsunami). The laser has a center wavelength of 800.32 nm and a full-width-half-maximum length of ~ 10.5 nm. The laser power is in the range of 0.3 ~ 1.2 W with the pulse duration of ~ 200 fs and the repetition rate of 80.7 MHz. The laser beam is guided by a series of broadband dielectric mirrors and finally focused by a 10× (Edmund Optics) objective lens to achieve a Gaussian intensity profile with a 1/e 2 radius of 20 μm on the quartz surface. An optical shutter controlled by a digital controller (KDC101, Thorlabs) is used to turn on/off the laser (see Figure 5a).
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