Noncritical phase-matching fourth- and fifth-harmonic generation of 1077 nm laser using KDP-family crystals

We systematically demonstrated the angular and temperature acceptances of noncritical phase-matching (NCPM) fourth- and fifth-harmonic generation (FHG and FiHG) of a 1077 nm laser in NH4H2PO4 (ADP), KH2PO4 (KDP), and KD2PO4 (DKDP) crystals. In this work, a new, to the best of our knowledge, laser frequency with a wavelength of 1077nm was generated by optical parametric amplification, in which the pump light (526.3 nm) was generated by the frequency doubling of a Nd:YLF laser (1052.7 nm), and the signal light was a Yb:YAG laser (1029.5 nm). Subsequently, the 1077nmlaserwas used as the fundamentalwave forFHG and FiHG to obtain a deep-ultraviolet laser source. For ADP andDKDPcrystals, NCPMFHGof a 1077nmlaserwas realized at 74.0.C and 132.5. C, respectively, and large angular acceptances of 59.8 and 61.6 mrad were measured. For the FiHG, NCPM was realized in a KDP crystal at 48.5 degrees C with an angular acceptance of 56.4 mrad. The results pave the way for high-energy and high-power deep-ultraviolet laser generation using KDP-family crystals under noncryogenic conditions. (C) 2022 Optica Publishing Group

Automated summary

In this study, the angular and temperature acceptances of noncritical phase-matching (NCPM) fourth- and fifth-harmonic generation (FHG and FiHG) of a 1077 nm laser in NH4H2PO4 (ADP), KH2PO4 (KDP), and KD2PO4 (DKDP) crystals were systematically demonstrated. A new laser frequency with a wavelength of 1077 nm was generated by optical parametric amplification, which can be used as a deep-ultraviolet laser source.