Table of Contents
How does an acousto-optic modulator work?
How Does an Acousto-Optic Modulator Work? Acousto-optic modulator typically uses a transparent crystal or piece of glass as a medium for light propagation. An electric signal then drives an attached transducer to vibrate, therefore generating a sound wave within the cell.
How does an acousto-optic deflector work?
Acousto-optic deflectors are devices which can be used to deflect a laser beam in one direction by a variable angle, controlled by the frequency of an electrical signal. Figure 1: Schematic setup of a non-resonant acousto-optic modulator….
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What is Raman Nath diffraction?
When a light beam is incident on such a refractive index grating, diffraction takes place and this produces either multiple order diffraction or only single order diffraction. The former is referred to as Raman–Nath diffraction and is usually observed at low acoustic frequencies.
What are acousto-optic devices?
❖ An acousto-optic modulator (AOM) is a device which can be used for controlling the power of a laser beam with an electrical drive signal. It is based on the acousto-optic effect, i.e. the modification of the refractive index of some crystal or glass material by the oscillating mechanical strain of a sound wave.
What are acousto optic devices?
What are the characteristics of acoustical waves?
The five main characteristics of sound waves include wavelength, amplitude, frequency, time period and velocity. Wavelength: The most important characteristic of sound waves may be the wavelength.
How does an optical filter work?
Optical filters selectively transmit light in a particular range of wavelengths, that is, colours, while absorbing the remainder. They can usually pass long wavelengths only (longpass), short wavelengths only (shortpass), or a band of wavelengths, blocking both longer and shorter wavelengths (bandpass).
What is the difference between a sound wave and an acoustic wave?
Ultrasonic waves are acoustic waves that are so high in frequency that humans can’t hear them; however, infrasonic waves are sound waves that are lower in frequency than what humans can hear. A subsonic wave is a wave that is traveling slower than the speed of sound and a supersonic waves travels faster.
What are RF tunable filters?
Tunable RF Filters are bandpass filters whose passband frequency can be fine tuned. The passband frequency can be modified digitally, with a know (mechanically) or by using a control voltage. everything RF has listed tunable filters from the leading manufacturers and made them searchable by specification.
What are the two 2 types of optical filters?
There are two classes of optical filters that have different mechanisms of operation: absorptive filters and dichroic filters.
Why optical filters are used in spectrophotometer?
The optical filter is a device or material that changes the spectral distribution a light beam spectrally selectively or non-selectively. Absorption and interference filters are frequently used in colorimeters and abridged spectrophotometers.
Can humans hear supersonic?
Although this limit can vary from one person to another, humans can generally hear sounds from 20 Hz to 20,000 Hz. Ultrasonic sounds are high-frequency sound waves that are beyond the limit of human hearing. For this reason, sounds above 20,000 Hz are referred to as ultrasound.
How does acoustic power affect diffraction efficiency?
For small acoustic powers, the diffraction efficiency is proportional to the acoustic power; for higher powers, it saturates. For sufficiently high acoustic power, more than 50% of the optical power can be diffracted – in extreme cases, even more than 95% diffraction efficiency is achieved.
What is acousto-optic effect?
It is based on the acousto-optic effect, i.e. the modification of the refractive index of some crystal or glass material by the oscillating mechanical strain of a sound wave ( photoelastic effect ).
What makes a good acousto-optic frequency shifter or acoustic deflector?
For acousto-optic frequency shifters and acousto-optic deflectors, other aspects can come into play. For example, a low velocity of sound is advantageous for achieving a wide range of beam angles.
How to choose the best acousto-optic modulator and RF driver?
Our acousto-optic modulators are optimized for low scatter and high laser damage threshold. Rise time, modulation rate, beam diameter, and power handling needs of the application need to be understood in order to identify the best acousto-optic modulator and RF driver solution.