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Powerful and efficient optical frequency combs in the mid‐infrared (MIR) spectral region are highly desirable for a broad range of applications. Despite extensive efforts utilizing various techniques, MIR frequency comb sources are still lacking power, efficiency, or bandwidth for many applications. Here, the generation of an intrinsically locked frequency comb source centered at 4.18 µm from an optical...
Optical parametric oscillators synchronously pumped with 1-µm femtosecond and picosecond lasers are used to generate long-wave mid-infrared radiation using the nonlinear material orientation-patterned gallium phosphide. The output spectra from the femtosecond OPO are measured, demonstrating tuning based on grating period and temperature from 5.5 to 13.0 µm. The picosecond OPO produces 137 mW at 7...
We achieved 2.35–4.75 μm continuous spectrum from an Er-fiber pumped subharmonic OPO based on orientation-patterned GaP that is suitable for ultra-broad bandwidth comb generation. Less than 67-fs pulse duration and 29-mW output power were measured.
We report a broadband mid-IR output reaching >1.5 octaves at −30dB level from a subharmonic orientation-patterned GaAs OPO pumped by an ultrafast (62-fs) Kerr-lens mode-locked Cr:ZnS laser at 2.35 μm with 800-mW average power.
First demonstration of simultaneous frequency doubling and frequency quadrupling of a pulsed carbon-dioxide laser in a single-grating orientation-patterned Gallium Phosphide crystal grown by hydride vapor phase epitaxy is reported.
We demonstrate a carrier offset frequency tunable comb producing 25 mW in the midinfrared via DFG in OP-GaP between Er and Tm fiber amplifiers seeded with a common Er fiber comb.
The first temperature-dependent Sellmeier equation for GaP was fit to extensive refractive index data measured on thin GaP plates for wavelengths between 1 and 12 microns over a temperature range of 200 to 450K.
Midinfrared frequency combs are a promising tool for new applications in chemical imaging and sensing, as they can directly access molecular vibrations in the molecular fingerprint wavelength region [1]. Practical laser sources are moving steadily from few micrometer wavelengths further into the fingerprint region to the 10 μm region. For practical applications of midinfrared light, difference frequency...
Recently we investigated cascaded schemes for down-conversion to the mid-IR spectral range above 5 μm by implementing the second stage based on a non-oxide nonlinear crystal inside the cavity of a ns optical parametric oscillator (OPO) based on Rb:PPKTP, pumped by a Q-switched Nd:YAG laser [1-3]. Intracavity difference-frequency generation (DFG) [2, 3] turned out to be more efficient compared to intracavity...
We exploit the wide infrared transparency, versatile phasematching and low two-photon absorption of orientation patterned gallium phosphide (OPGaP) to demonstrate a 1-μm-pumped optical parametric oscillator producing broadband idler pulses centered from 5.5–10.4 μm.
We report the first femtosecond OP-GaP based OPO suitable for ultrabroadband frequency comb generation. The 15-dB bandwidth of 2.6–4.2 μm was obtained from a compact low-threshold (14 mW) OPO pumped by 85-fs Er-fiber laser.
We generate over 10 mW of broadband pulses at 7 to 10 micrometer wavelength in orientation-patterned gallium phosphide by difference frequency mixing between the fundamental and Raman-shifted component of a femtosecond Er fiber laser.
First demonstration of frequency doubling of a continuous-wave carbon dioxide laser using hydride vapor phase epitaxy grown orientation-patterned gallium phosphide is reported. Temperature dependence of second harmonic power was determined.
We discuss high power mid-infrared laser sources based on frequency conversion of solid-state lasers operating in the 2-micron spectral region. These lasers are shifted to the mid-infrared via optical parametric oscillation in ZGP and OPGaAs.
The first 1064-nm-pumped OP-GaP OPO was successfully demonstrated. A Q-switched Nd:YVO4 laser (∼1W, 3.3ns, 10kHz) pumped OP-GaP (16.5-mm-long, 20.8-micron grating period) yielded temperature-tunable signal and idler output wavelengths of 1385–1361 nm and 4591–4876 nm respectively.
We measure the carrier envelope offset frequency of a degenerate optical parametric oscillator. We verify that it has half the value of the pump frequency comb, and sub-Hertz level relative linewidth.
Optical parametric oscillation was achieved for the first time in OP-GaP. Tm-fiber-pumped Ho:YAG (2090nm, 20W, 20kHz, 12ns) generated 350 mW signal (3.54μm) plus idler (5.1μm) from a 92.7-μm grating period crystal in a linear DRO.
We report room temperature frequency doubling of a continuous-wave carbon dioxide laser tuned from 9.26 to 10.65 micrometers using large-aperture OPGaAs crystals (>3 mm thick by >7.5 mm wide) in fan-out and single grating configurations.
Substantial increases in substrate temperature, super-saturation, and V/III ratio have dramatically improved vertical domain propagation during hydride vapour phase epitaxy of orientation-patterned gallium phosphide, leading to device-quality quasi-phasematched layer thicknesses exceeding 400 microns.
We combine a Tm-fiber frequency comb, phase-locked doubly-resonant GaAs optical parametric oscillator, multipass cell, and Fourier transform spectrometer to measure comb-resolved spectra at wavelengths of 3.1 to 5.5 micrometers for multiple gases at trace concentrations.
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