Abstract:
Laser action in the visible spectrum is achieved by use of an infrared-emitting GaAs diode. Second photon or higher order photon processes are involved.
Abstract:
Increased light output results from certain design modifications in a GaAs infrared emitting diode coated with a phosphor for converting this emission to visible light. These design modifications include shape and dimensional considerations for minimizing internal reflection and absorption of infrared emission within the diode as well as dimensional and compositional considerations as applied to the coating for reducing scattering losses and minimizing internal reflection of its emission.
Abstract:
A color pictorial display is produced by scanning a phosphor layer with a frequency and/or amplitude-modulated infrared beam. Visible emission results by virtue of a two-photon or high-order multiphoton process.
Abstract:
A crystal of KTax Nb1-x O3, where x lies between 0.2 and 0.8 is produced by said crystal growth from a melt at 1250 DEG C in an oxygen containing atmosphere. Initial ingredients may be in the form of oxides or carbmates, and small quantities of Sn, Si, Ge and Ti may be added as dopants. Care is taken to minimise the presence of Ca, Cl, F, Sr, Ba, Na and Li.
Abstract:
Q-switching of a laser is accomplished by controlling the state of an intracavity acousto-optic switch that comprises a piezoelectric transducer bonded to a low-optical-loss ultrasonic propagation medium. Energization of the transducer causes a traveling acoustic diffraction grating to propagate through the medium. Illustratively, the direction of propagation of the grating is perpendicular to the direction in which light travels in the laser. The interaction between the light and the acoustic grating gives rise to diffraction losses that prevent the laser from oscillating. In response to a momentary deenergization of the transducer, the laser cavity is restored to a high-Q oscillatory condition during which energy stored in the system during the nonoscillatory state is suddenly released. During each such deenergization period, a high-amplitude output pulse of coherent radiation is obtained.