title: Photorefractive effect in GaP.
abstract: The photorefractive effect in undoped semi-insulating GaP was observed. GaP has a photorefractive sensitivity in the spectral region of 0.6 to 0.9 microm. The photorefractive center is the deep donor resulting from the P antisite defect. We measured the two-beam coupling gain coefficient and its time constant as functions of the grating period and the pumping intensity, using a 633-nm He-Ne laser. The maximum gain coefficient of 0.33 cm(-1) was obtained at a grating period of 1.1 microm. The time constant, which depends on the grating period, was 3-20 msec at a pumping intensity of 30 mW/cm(2).
authors.forename: K
authors.initials: K
authors.lastname: Kuroda
authors.forename: Y
authors.initials: Y
authors.lastname: Okazaki
authors.forename: T
authors.initials: T
authors.lastname: Shimura
authors.forename: H
authors.initials: H
authors.lastname: Okamura
authors.forename: M
authors.initials: M
authors.lastname: Chihara
authors.forename: M
authors.initials: M
authors.lastname: Itoh
authors.forename: I
authors.initials: I
authors.lastname: Ogura