Device for improving laser wavelength conversion efficiency and high-power multi-wavelength fiber-format femtosecond laser system using the device

A laser system configured to provide high-power multi-wavelength femtosecond laser pulses using a device for improving laser wavelength conversion efficiency, comprising a NIR laser, a first lens, a photonic crystal fiber (PCF) and a second lens, the device for improving laser wavelength conversion efficiency comprises a wavelength conversion member photonic crystal fiber (PCF);

• the device for improving laser wavelength conversion efficiency improves wavelength conversion efficiency by shortening the length of the PCF;
• wherein:
• the NIR laser is used to generate laser pulses;
• the first lens is used for focusing the laser pulses generated by the NIR laser and coupling the laser pulses into the PCF;
• the PCF is used to broaden the wavelength window of the laser pulses transmitted inside it through Soliton self-frequency shift (SSFS) and Cherenkov radiation, and to obtain light in three different wavelength ranges;
• the length of the PCF LPCF is ≤1.25 cm;
• the second lens is used to convert the multi-wavelength light output from the PCF into parallel light, and to output the parallel light,
• the NIR laser is a Yb-fiber laser with a center wavelength of 1070 nm,
• the wavelength range of Cherenkov radiation is 750-1000 nm, the wavelength range of the negative dispersion of laser pulses generated by the NIR laser at 1070 nm is 1000-1100 nm, and the wavelength range of SSFS is 1100-1400 nm.