1-μm-pumped OPO based on orientation-patterned GaP

Nanosecond difference-frequency generation in orientation-patterned gallium phosphide

“…The DFG wavelength varies at a rate of 2.4 nm/ºC. Here, the circles represent the experimental data, while the solid curves correspond to calculated temperature tuning range in OP-GaP using the relevant Sellemier equations [13]. As evident from the plot, we were able to obtain DFG spectral coverage over 233 nm in the mid-IR by tuning the OPO signal wavelength over 104 nm.…”

“…The measurement resulted in a FWHM temperature acceptance bandwidth of ΔT~17.7 ºC. This is much wider than the theoretically estimated bandwidth of ΔT=1 ºC for a 40-mm-long OP-GaP crystal under plane-wave approximation, using the relevant temperature-dependent Sellmeier equations [13], as shown in the inset of Fig. 4.…”

“…Its wide transparency range, with short-wavelength cut-off extending below 1 µm enables the deployment of the well-established Ndbased solid-state or Yb-based fiber pump laser technology for efficient frequency conversion into the mid-IR. Moreover, the QPM condition can be engineered by orientation-patterning the required grating period, enabling wavelength conversion over the full transparency range of the material.Earlier reports on nonlinear frequency conversion in OP-GaP include a nanosecond doubly-resonant OPO (DRO) pumped at 1064 nm, generating 4 mW of idler at 4624 nm and 15 mW of signal at 1324 nm at 10 kHz [13], and a nanosecond DRO pumped at 2090 nm operating at a fixed idler wavelength of 5100 nm and a signal wavelength of 3540 nm, providing a total signal plus idler output power of 350 mW at 20 kHz [14]. In the continuous-wave…”

“…Earlier reports on nonlinear frequency conversion in OP-GaP include a nanosecond doubly-resonant OPO (DRO) pumped at 1064 nm, generating 4 mW of idler at 4624 nm and 15 mW of signal at 1324 nm at 10 kHz [13], and a nanosecond DRO pumped at 2090 nm operating at a fixed idler wavelength of 5100 nm and a signal wavelength of 3540 nm, providing a total signal plus idler output power of 350 mW at 20 kHz [14]. In the continuous-wave…”

“…Earlier reports on nonlinear frequency conversion in OP-GaP include a nanosecond doubly-resonant OPO (DRO) pumped at 1064 nm, generating 4 mW of idler at 4624 nm and 15 mW of signal at 1324 nm at 10 kHz [13], and a nanosecond DRO pumped at 2090 nm operating at a fixed idler wavelength of 5100 nm and a signal wavelength of 3540 nm, providing a total signal plus idler output power of 350 mW at 20 kHz [14]. In the continuous-wave (cw) regime, single-pass DFG based on a 16.5-mm-long OP-GaP crystal was demonstrated, generating up to 150 mW of DFG power at 3400 nm for an input pump power of 47 W at 1064 nm, together with 24 W of input signal power at 1550 nm [15].…”