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A diode laser in which the light generated is coupled into an optical fiber.

Depending on the active region material, the band gap width of the semiconductor material of the blue light semiconductor laser varies, so the semiconductor laser can emit light of different colors. The active region material of the blue light semiconductor laser is GaN or InGaN.

As a core driving force in the field of industrial manufacturing, laser technology itself is constantly moving forward. In summary, lasers are developing in the four major directions of "faster, higher, better, and shorter".

Fiber optic gyroscope is the fiber angular velocity sensor, which is the most promising one among various fiber optic sensors. The fiber optic gyroscope, like the ring laser gyroscope, has the advantages of no mechanical moving parts, no warm-up time, insensitive acceleration, wide dynamic range, digital output, and small size. In addition, the fiber optic gyroscope also overcomes the fatal shortcomings of ring laser gyroscopes such as high cost and blocking phenomenon. Therefore, fiber optic gyroscopes are valued by many countries. Low-precision civilian fiber optic gyroscopes have been produced in small batches in Western Europe. It is estimated that in 1994, the sales of fiber optic gyroscopes in the American gyroscope market will reach 49%, and the cable gyroscope will take the second place (accounting for 35% of sales).

Fiber laser refers to a laser that uses rare-earth-doped glass fiber as the gain medium. Fiber laser can be developed on the basis of fiber amplifier: high power density is easily formed in the fiber under the action of pump light, resulting in laser The laser energy level of the working substance is "number inversion", and when a positive feedback loop (to form a resonant cavity) is properly added, the laser oscillation output can be formed.