Adjustable picosecond laser

Abstract

The invention relates to an adjustable picosecond laser. The adjustable picosecond laser is formed through the connection of all-polarization maintaining optical fiber devices; one end of the picosecond laser is a saturable absorption device, and then a gain optical fiber, a wavelength division multiplexer, a beam splitter, an optical switch, a plurality of delay optical fibers and optical fiber gratings correspondingly connected with the delay optical fibers one by one are orderly connected behind the saturable adsorption device; the other input port of the wavelength division multiplexer is connected with a pumping source, the other two ports of the beam splitter are respectively used as an oscillator output end and a monitoring end. An optical fiber link designed with the all polarization maintaining structure can resist the environment interference, and guarantee the long-term stabilization of the output pulse; a plurality of pulse widths, working wavelengths and repetition frequency required by the application can be previously set; by use of the optical switch, the adjustable picoseconds laser can be flexibly switched in multiple laser output parameters, so that application requirements can be met; and compared with the semiconductor picosecond laser in electric pulse modulation, the average power output by the adjustable picosecond laser is high, and adjustable picoseconds laser is more suitable to be a seed source for subsequent laser amplification.

Description

technical field [0001] The invention relates to a laser technology, in particular to a tunable picosecond laser with variable repetition frequency, variable pulse width and variable output wavelength. Background technique [0002] The picosecond laser can perform high-precision processing of industrial materials such as metals, metal carbides, silicon wafers, sapphire, and ceramics, especially the laser pulse width of about 5ps-100ps is more advantageous. Compared with MOPA nanosecond pulses and electrically modulated pulses of more than 100 picoseconds, 5ps-100ps pulses have narrower pulse widths and can generate higher laser peak powers. More importantly, the short time width of the picosecond pulse can effectively reduce the thermal effect caused by the laser radiation and achieve the peak energy density required for the material's ablation critical point. [0003] At present, picosecond pulses with tunable pulse width are all electrically modulated semiconductor lasers....

AI Technical Summary

Problems solved by technology

The low output power of the oscillator makes the subsequent optical amplification process produce spontaneous emission that is difficult to suppress, and the pulse signal-to-noise ratio degrades

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