GLASS LASER MODIFYING METHOD Russian patent published in 2019 - IPC C03C3/78 C03B32/02 

FIELD: information technology.

SUBSTANCE: invention relates to a method of modifying a glass structure under the action of a laser beam for forming luminescent microregions and can be used for multiple rewriting and storage of information. In a silicate glass containing cadmium sulphide, a microregion is recorded during local irradiation with femtosecond laser pulses with a wavelength in the near infrared range, with energy of laser pulses in range of 100–400 nJ, duration of laser pulses of 180–600 fs, repetition frequency of laser pulses within 100–1,000 kHz. A lens with a numerical aperture of 0.45–0.85 is used to focus the laser beam. Further, it is possible to erase the recorded microregion by scanning it with a femtosecond laser beam or moving the glass relative to the focused beam along a path, which is set by the movement speed in range of 10–30 mcm/s, diameter in range of 30–100 mcm and oscillation frequency along the axis perpendicular to the direction of movement, in the plane perpendicular to the direction of incidence of the recording laser beam, equal to 20 Hz. For deletion, a laser beam is used with a wavelength in the near infrared range, with energy of laser pulses in range of 100–400 nJ, duration of laser pulses of 180–600 fs, repetition frequency of laser pulses within 50–500 kHz at laser beam focusing with lens with numerical aperture of 0.45–0.85. In the erased region, microregions can be repeatedly recorded during local irradiation with femtosecond laser pulses with wavelength in the near infrared range and laser beam parameters used in recording the initial microregions.

EFFECT: possibility of creating durable optical memory with possibility of rewriting.

1 cl, 4 dwg, 3 ex