Repetition frequency adjustable dual-wavelength nano-joule picosecond laser

Abstract

The invention discloses a repetition frequency adjustable dual-wavelength nano-joule picosecond laser, which comprises a single output mode-locked resonant cavity, a 45-degree reflection light guide mirror, an optical isolator, a reflective electro-optic pulse selector, a frequency doubling crystal, a wavelength beam splitter and a 45-degree reflecting mirror. A quarter-wave plate and a polarizingplate are used for forming a single output mode-locked resonant cavity output mirror with adjustable output rate to output a mode-locked picosecond pulse with high repetition frequency and nano-joulepulse energy; the selection of the mode-locked picosecond pulse is realized via the reflective pulse selector to obtain a picosecond pulse with adjustable repetition frequency; frequency conversion is carried out by the frequency doubling crystal to obtain a dual-wavelength nano-joule picosecond pulse laser. The repetition frequency adjustable dual-wavelength nano-joule picosecond laser in the invention adopts the quarter-wave plate and the polarizing plate as the output rate tunable output mirror in the single output mode-locked resonant cavity, to obtain a mode-locked single output with adjustable nano-joule energy, and adopts the reflective electro-optic pulse selector and an emission angle tunable mirror to reduce the high voltage of the electro-optic crystal and meet the requirementsof the laser divergence angle as needed.

Description

technical field [0001] The invention belongs to the field of lasers, and more specifically relates to a dual-wavelength nanojoule picosecond laser for generating picosecond pulses and adjustable repetition frequency. Background technique [0002] Ultrashort and ultrafast picosecond lasers have been widely used in fine processing, bioscience, high-precision laser ranging and other fields. Due to the short pulse of the picosecond laser, the time it interacts with the material is also very short, which is consistent with the heat generation rate of the material. In this way, when the picosecond laser acts on the material, the material will not generate heat in the future, and the laser will not act on the material. No heat can be generated on the material. Since there is no heat accumulation in the material material, there will be no thermal stress and other forces, so that the material material will not be deformed or ablated due to thermal efficiency under the action of the p...

AI Technical Summary

Problems solved by technology

In the invention patent CN201210292371.2 "A resonant cavity and mode-locked picosecond laser for outputting mode-locked picosecond lasers", one of the plano-concave mirrors is used as the coupling output mirror, and the plano-concave mirror is used between the semiconductor saturable absorber and the laser Between the crystals, that is, the output mirror is placed in the middle of the mode-locked resonator to output two modes of mode-locked light. In this way, only one mode-locked light is used for the two modes of mode-locked light, which makes the other output light wasteful.

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