What is magneto-optic modulator?
What is magneto-optic modulator?
Magneto-optic modulator (MOM) concept and design. A magnetic-sensitive medium exhibits circular birefringence, i.e., difference in the refractive indices for left- and right-handed circular polarization, by applying a magnetic field. This is known as the Faraday effect.
What is magneto-optical Faraday rotation?
The Faraday effect or Faraday rotation, sometimes referred to as the magneto-optic Faraday effect (MOFE), is a physical magneto-optical phenomenon. The Faraday effect causes a polarization rotation which is proportional to the projection of the magnetic field along the direction of the light propagation.
What is a Faraday modulator?
A Faraday modulator consists of a solenoid containing a glass rod inside and an AC power supply wich output is modulated by a lock-in amplifier. The alternated magnetic field inside the solenoid causes the polarization plane of the He-Ne laser radiation to be rotated and modulated as it passes through the glass rod.
What is meant by magneto-optic effect?
Magneto-optic effect refers to physical interaction between light and magnetic matter. When a beam of light enters a magnetic substance, the properties of output light could be modulated by the light-substance interaction, such as polarization state, spectrum, phase and intensity of light.
How does a magneto-optical trap work?
Magneto-optical traps (MOTs) allow for cooling the gases consisting of neutral atoms down to the temperatures around 100µK. Optical cooling process relies on slowing down the atoms due to transfer of momentum from the beam of resonant laser photons.
Who discovered magneto optic effect?
In 1846, Faraday discovered the first magneto-optical phenomenon for which the plane of linearly polarized light is rotated after passing through a piece of glass exposed to an external magnetic field1. Thirty years later, Kerr found the corresponding effect in the reflected light2.
How does a Faraday rotator work?
Faraday Rotators are ferromagnetic crystals surrounded by strong permanent magnets, which form a magneto-optic device. Linearly polarized light sent through a faraday rotator will be rotated by 45° independently of the input angle.
What are the applications of magneto-optic effect?
It is shown how certain materials with high magneto-optic figures of merit may be used to construct low frequency and high frequency infrared modulators. Further applications such as current measurement in high voltage conductors and magneto-optic computer memories are also briefly described.
How does optical lattice work?
A basic optical lattice is formed by the interference pattern of two counter-propagating laser beams. The trapping mechanism is via the Stark shift, where off-resonant light causes shifts to an atom’s internal structure. The effect of the Stark shift is to create a potential proportional to the intensity.
What is optical molasses in physics?
Optical molasses is a laser cooling technique that can cool neutral atoms to temperatures lower than a magneto-optical trap (MOT). An optical molasses consists of 3 pairs of counter-propagating circularly polarized laser beams intersecting in the region where the atoms are present.