Two-color thermometer, laser system, and temperature measurement method

A two-color thermometer comprising:

• a first sensor that detects a first intensity that is an intensity of first infrared radiation emitted by an object;
• a second sensor that detects a second intensity that is an intensity of second infrared radiation emitted by the object at a wavelength different from a wavelength of the first infrared radiation;
• and
• a temperature calculator that calculates a first coefficient by inputting, into a correction function, a second coefficient calculated from the first intensity detected by the first sensor and the second intensity detected by the second sensor, and calculates a temperature of the object based on the first coefficient calculated and an intensity ratio between the first intensity detected by the first sensor and the second intensity detected by the second sensor, wherein
• the correction function is calculated from a first correction coefficient calculated in advance from a measured temperature of each of a plurality of different materials and a second correction coefficient calculated in advance from the measured temperature of each of the plurality of different materials.