Abstract: The information display device includes a display unit configured to display information; an irradiating unit configured to irradiate the display unit with light; at least one imaging unit configured to capture an image on the display unit; a controller configured to cause the irradiating unit to alternately switch irradiation and non-irradiation; a medium identifying unit configured to identify a first input medium that emits light and a second input medium that does not emit the light, used for inputting additional information to be added to the information, in accordance with images successively captured by the at least one imaging unit, by the controller causing the irradiating unit to alternately switch the irradiation and the non-irradiation; and a position detector configured to detect positions of the first input medium and the second input medium on the display unit in accordance with the images successively captured.

Abstract: The information display device includes a display unit configured to display information; an irradiating unit configured to irradiate the display unit with light; at least one imaging unit configured to capture an image on the display unit; a controller configured to cause the irradiating unit to alternately switch irradiation and non-irradiation; a medium identifying unit configured to identify a first input medium that emits light and a second input medium that does not emit the light, used for inputting additional information to be added to the information, in accordance with images successively captured by the at least one imaging unit, by the controller causing the irradiating unit to alternately switch the irradiation and the non-irradiation; and a position detector configured to detect positions of the first input medium and the second input medium on the display unit in accordance with the images successively captured.

Abstract: A laser oscillation device comprises a light emitting unit for projecting a pump laser beam, a laser medium for absorbing the pump laser beam and for emitting a spontaneous emission light, a saturable absorber for absorbing the spontaneous emission light and for emitting a pulsed light, and a holder for holding the laser medium in a close contact state, wherein a portion of the holder as appressed against at least one surface of the laser medium is made of a metal and the pump laser beam is projected to an edge portion of the laser medium as appressed against the holder.

Abstract: A laser oscillation device comprises a light emitting unit for projecting a pump laser beam, a laser medium for absorbing the pump laser beam and for emitting a spontaneous emission light, a saturable absorber for absorbing the spontaneous emission light and for emitting a pulsed light, and a holder for holding the laser medium in a close contact state, wherein a portion of the holder as appressed against at least one surface of the laser medium is made of a metal and the pump laser beam is projected to an edge portion of the laser medium as appressed against the holder.