Abstract
Stress induced modulation of the diffraction angle and efficiency of the light reflected from a stripe-domain magnetic garnet was demonstrated. The spacing of the magnetic domain was changed using the inverse magnetostriction effect. The sample structure was a piezo actuator/Al reflection layer/magnetic garnet substrate. A diffraction angle between the 0th and 1st ordered light was changed from 9.12 deg. to 10.20 deg. This result indicates that the domain spacing was changed from 3.3 μm to 3.0 μm. The change of the diffraction angle was irreversible for the voltage. However, reversible, linear and continuous change of the diffraction efficiency was observed. These results could be applicable for a voltage-driven optical solid state light deflector with low power consumption and high switching speed.
Highlights
Laser beam steering systems are key components of several types of modern devices such as scanners[1,2] or projectors.[3,4] Typically, they employ a moving mirror to steer a laser beam.[5,6,7,8] The deflection angle velocities of these devices are fundamentally limited to up to a few dozen kilohertz because of the inertia associated with the mass of the mirrors and other moving parts.[9]
The diffraction angle and efficiency of a MO diffraction of a stripe-domain magnetic garnet was modulated by an inverse magnetostriction effect
A piezo actuator was employed to convert the voltage to the stress applied to YIG
Summary
Laser beam steering systems are key components of several types of modern devices such as scanners[1,2] or projectors.[3,4] Typically, they employ a moving mirror to steer a laser beam.[5,6,7,8] The deflection angle velocities of these devices are fundamentally limited to up to a few dozen kilohertz because of the inertia associated with the mass of the mirrors and other moving parts.[9]. Optical solid state deflectors, which rely on the electro-optical or acousto-optic effect, have been developed and are being applied. They do not contain moving parts and can exhibit high deflection angle velocities.[9,10,11]. Where λ is the magnetostriction constant, σ is the applied stress, and φ is the angle between stress and magnetic moment This formula suggests that the anisotropy could be effectively changed by the stress, and the stress can modulate the domain spacing. The inverse magnetostriction effect, which principally changed the spacing of the domain without saturation, was employed to modulate the spacing and the magnetization
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