AOM Acousto optic modulator AOTF Acousto-optic Tunable Filters


AOM Acousto optic modulator AOTF Acousto-optic Tunable Filters
 
The acousto-optic tunable filter (AOTF) is an electro-optical device that functions as an electronically tunable excitation filter to simultaneously modulate .
 
 
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Assisted with the laser gain regulation based on the polarization conversion induced by vector mode coupling during acousto-optical interactions, the wavelength of near-transform-limited soliton laser can be widely tuned by controlling the acoustical wave frequency.
 
 
AOM are used in Laser printer,Laser Doppler measuring,Various light recording,Various light,Lasr processing.While AOTF are used in Rapid scan spectrum analyzer,Color decomposition.
 
It helps us to modulate the intensity of the beam laser, in order to analize the recovery of fluorescence. Initialy it excites the molecule with a low intensity (measuring the light emmited), but in some milisecond it applies a high intensity to bleach the area, and then it reduces the intensity again to measure the fluorescence in a detector (APD). We can do this with an AOM or AOTF, applying voltage to a driver that it gives a RF wave to the AOM and change the refraction index to modulate the intensity.
 
laser's spec:
 
488 nm – Externally Doubled Diode Lasers
200 mW Excelsior-488, Collimated, incl. Power Supply (100 - 240 VAC), Laser Head Cable
Wavelength 488 nm
Output Power 200nW
Spectral Linewidth <10 MHz (<0.01 pm)
Spatial Mode ?TEM00
Longitudinal Mode Single
Frequency Drift ?<50 MHz/°C
Beam Quality ?M2 <1.1
Beam Diameter (1/e2): Collimated ?0.7 ±0.05 mm
Beam Divergence: Collimated ?<1.1 mrad
Beam Ellipticity ?1 ±0.1
Beam Pointing Stability ?<10 μrad/°C
Noise <0.2% rms (20 Hz–20 MHz)
Power Stability (over 8 hours) ?<±1%
Polarization Ratio ?>100:1 (vertical
Warm-up Time ?<5 min
Beam Height ?19 mm
Technology Externally Doubled Diode
 
Wavelength is important in many arenas of the optical sciences, fluorescence spectroscopy and microscopy. Acousto-optic tunable filter (AOTF), are employed to modulate the wavelength, ?and amplitude of illuminating laser light. You can read more about AOTF here.?
 
Here are more information about AOTF for your reference.
 
The acousto-optic tunable filter (AOTF) is a device that functions as an electronically tunable excitation filter to simultaneously modulate the intensity and wavelength of multiple laser lines from one or more sources.?olympusmicro
 
Acousto-Optics Components from Brimrose. Brimrose is a world technology leader in the area of Acousto-Optics components, serving the U.S government and world wide industry since 1979.
 
Acousto-optic imaging: Merging the best of two worlds