Hologram manufacturing device and hologram manufacturing method

A hologram manufacturing device comprising:

• a master hologram on which a diffraction grating is formed;
• a duplicate hologram disposed close to the master hologram;
• a first light source that emits, to the master hologram and the duplicate hologram, a first laser light that satisfies a Bragg diffraction condition in the diffraction grating;
• and
• a second sensor that measures the first laser light after passing through the master hologram and the duplicate hologram,
• wherein exposure of the duplicate hologram with the first laser light ends based on a measurement result of the second sensor.

A hologram manufacturing method comprising:

• a step of disposing a master hologram on which a diffraction grating is formed and a duplicate hologram close to each other;
• a step of emitting, to the master hologram and the duplicate hologram, a first laser light that satisfies a Bragg diffraction condition in the diffraction grating and a second laser light that does not satisfy the Bragg diffraction condition in the diffraction grating;
• and
• measuring the second laser light after passing through the master hologram and the duplicate hologram, and ending exposure of the duplicate hologram with the first laser light based on a result of the measurement.

A hologram manufacturing device comprising:

• a master hologram on which a diffraction grating is formed;
• a duplicate hologram disposed close to the master hologram;
• a first light source that emits a first laser light for exposing the duplicate hologram to the duplicate hologram at a first incident angle;
• a second light source that emits a second laser light to the duplicate hologram at a second incident angle different from the first incident angle;
• and
• a sensor that measures the second laser light reflected by the duplicate hologram,
• wherein exposure of the duplicate hologram with the first laser light ends based on a measurement result of the sensor.

A hologram manufacturing method comprising:

• a step of disposing a master hologram on which a diffraction grating is formed and a duplicate hologram close to each other;
• a step of emitting a first laser light for exposing the duplicate hologram to the duplicate hologram at a first incident angle and emitting a second laser light to the duplicate hologram at a second incident angle different from the first incident angle;
• and
• a step of measuring the second laser light reflected by the duplicate hologram, and ending exposure of the duplicate hologram with the first laser light based on a result of the measurement.