US 11,789,336 B2
Device for improving laser wavelength conversion efficiency and high-power multi-wavelength fiber-format femtosecond laser system using the device
Chi-Kuang Sun, Taipei (TW); and Yang-Ting Hsiao, Taipei (TW)
Assigned to NATIONAL TAIWAN UNIVERSITY, Taipei (TW)
Filed by National Taiwan University, Taipei (TW)
Filed on Dec. 11, 2020, as Appl. No. 17/118,644.
Prior Publication US 2022/0190544 A1, Jun. 16, 2022
Int. Cl. G02F 1/383 (2006.01); G02F 1/35 (2006.01); G02F 1/37 (2006.01); H01S 3/00 (2006.01)
CPC G02F 1/383 (2013.01) [G02F 1/3513 (2013.01); G02F 1/374 (2021.01); H01S 3/0092 (2013.01)] 5 Claims
OG exemplary drawing
 
1. 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.