Femtosecond laser system with the stabilization of a pulse repetition rate of methane WITH reference frequency

摘要

The invention relates to the field of laser devices with the stabilization of the laser frequency output parameter, namely the laser optical frequency standards for stabilization of the repetition rate of the femtosecond fiber erbium laser. The technical result - in increasing the stability of the repetition frequency of the femtosecond laser pulses and in associated reduction in weight and size parameters of the system. The structure of the proposed system includes a femtosecond laser Femtosecond erbium fiber laser source, beam splitter, mirror, photodetector (PD) with a frequency mixer, a cavity length control unit. A signal splitter in a laser source is divided into a useful system output signal and the frequency control loop signal pulse, which then passes through the mirror and enters the PD from the frequency mixer. The second input to the mixer FPA frequency signal is connected to the reference oscillator, or one of its higher harmonics. At the mixer output generated pulse repetition frequency of the beat signal is connected to the control unit of the resonator length, whose output is a feedback signal of a femtosecond laser source. Thus as the reference oscillator used in the reference laser stabilized by methane cell. The reference laser stabilized by cell methane, helium-neon laser or chromium-zinc-selenium laser or Cr: cadmium-selenium laser can be used. Between the output of the reference laser and the second input of the PDU with mixer frequency of the second harmonic generator is installed. 2 ZP f-ly. 1 yl.