Magneto-optic modulator

During the past 15 years the Eu chalcogenides have received tremendous interest by scientists all over the world. One obvious reason was the hope of using these magnetic semiconductors industrially, e.g. in the form of fast, light beam addressable memory systems in computers, as magneto-optical modulators or as magnetic field activated electronic switches. 

Figure 2.24 The structure and working principle of a magneto-optical modulator.

For optimum performance, CD measurements require a polarization modulated source. In principle, any of the polarization-selective optical devices discussed earlier could be mechanically moved to create the required modulation. However, this approach is problematic in that it is difficult to implement physically, the mechanical movement may introduce noise into the measurement situation, and there are limitations to the rate at which the polarization can be modulated. A preferable approach is to use an electronic device to effect the required phase retardation. Although a number of devices have been used for this purpose (e.g. magneto-optical, Kerr effect, etc.), modern CD instruments rely upon either the Pockels effect, or photoelastic modulation for this function. 

In conclusion, we have presented a reliable method for selective production and detection of high-order atomic polarization moments based on the nonlinear magneto-optical effects with frequency modulated light. This method can be used for the selective control of higher order atomic coherences in multilevel systems exploiting large Kerr nonlinearities for the construction of all-optical quantum phase gates. 

Sato, K. Kida, H. (1988). Calculations of magneto-optical spectra in compositionally-modulated multilayered films. Journal de Physique, Colloque C8, C8-1779-80. 

Optical phenomena depending on crystal structure Electro-optic effect Magneto-optic effect Photoelastic effect Optical switch Display Modulator, optical deflector Optical isolator Optical circuit device (active device) Optical fiber sensor... 

The use of SLMs in matched filters has been proposed on several occasions, but has always been limited by the availability to suitable SLM technologies. The first use of SLMs in a BPOMF was done with a magneto-optic SLM [24] and proved to be the first step in the development of the BPOMF. The choice of binary phase modulation allows us to use FLC SLMs to display the information in an all-optical system. The availability of high quality transmissive FLC SLMs [25, 26] has opened the door to the possibility of practically implementing... 

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