Ionization device

An ionization device configured to generate ions by irradiating a sample with laser light, the ionization device comprising:

• a light source configured to emit laser light;
• a light collection optical system configured to collect laser light emitted from the light source and irradiate a sample with the laser light;
• a first intensity changing unit including an attenuator configured to continuously change an intensity of laser light with which the sample is irradiated;
• a second intensity changing unit including a darkening filter configured to stepwisely change an intensity of laser light with which the sample is irradiated;
• a storage unit configured to store a relationship between a irradiation diameter of the laser light, a level of changing the intensity of the laser light of the darkening filter, and the intensity of the laser light irradiated with the sample;
• and
• at least one processor configured to
• receive input of an irradiation diameter of laser light to the sample;
• receive input of an irradiation intensity of laser light to the sample;
• and
• change an irradiation diameter of the laser light by means of the light collection optical system;
• control the second intensity changing unit according to the irradiation diameter received based on the relationship;
• and
• set an intensity of the laser light with which the sample is irradiated by controlling the first intensity changing unit according to the irradiation intensity based on the relationship.