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We report a high-average-power picosecond optical parametric oscillator (OPO) tunable in the mid-infrared (mid-IR) based on CdSiP2 synchronously pumped by an Yb-fiber laser at ~ 80 MHz repetition rate. Successful operation of this high-repetition-rate singly-resonant picosecond OPO has been enabled by the improved CSP crystal quality over a long interaction length. The OPO can be tuned across 1264–1284 nm...
We report the first picosecond mid-infrared source based on OP-GaP using single-pass DFG, providing tunable radiation across 3040–3132 nm, with 57 mW of average-power at 3044 nm, 3.2% rms stability over 1h, in good beam-quality.
We report the first high-repetition-rate picosecond OPO based on CdSiP2, tunable across 6205–6695 nm in deep-IR, providing 105 mW at 6205 nm at 79.5 MHz, with 2.3% rms passive power-stability over 12h in high beam-quality.
Non-oxide nonlinear crystals are of great significance in the advancement of optical parametric sources in the mid-infrared (mid-IR) beyond 4 μm. The newly developed semiconductor material, orientation-patterned gallium phosphide (OP-GaP), holds promise as the next-generation quasi-phase-matched (QPM) crystal, offering high nonlinearity (d14=70.6 pm/V), wide transparency up to ∼12 μm, and significantly...
High-average-power high-repetition-rate picosecond sources at wavelengths >5 mm in the deep-infrared (deep-IR) are interesting for variety of applications in spectroscopy and medicine [1]. In the absence of conventional ultrafast lasers, synchronously-pumped optical parametric oscillators (OPOs) offer a viable approach to the generation of ultrashort pulses in the deep-IR [2]. In the high-repetition-rate...
Molecular precision spectroscopy opens new perspectives on tests of fundamental laws of physics and of fundamental constants variation [1]. The mid infrared (IR) is a key region for molecular spectroscopy, and the efforts towards the development of versatile, spectrally pure, and tunable coherent sources in this region have been constantly growing in the last decade. A convenient way to generate a...
We report the first cascaded pump-tuned mid-IR femtosecond OPO based on CdSiP2, providing rapid and hands-free tuning in 6–7 μm wavelength range, with up to 32 mW (6808 nm) of average power at 80 MHz.
High-power (110 mW) mid-IR output suitable for producing ultra-broadband frequency combs in the mid-infrared portion of the spectrum was produced in a subharmonic optical parametric oscillator (OPO) based on orientation patterned GaAs. The OPO was synchronously pumped by a compact 0.5-W femtosecond Cr:ZnS oscillator with the central wavelength 2.38 μm at pulse repetition frequency 175 MHz.
We report a mid-infrared femtosecond OPO based on CdSiP2 tunable across 6786–7069 nm, generating record power of 110-mW at 7μm, with passive power and wavelength stability below 3% rms (1-hour) and 0.1% rms (15-min), respectively.
We demonstrate a record-wide mid-IR comb using Tm-fiber-laser-pumped near-degenerate GaAs OPO. By varying intracavity dispersion, we observe a transition from a single-comb to a two-comb state, where two combs are offset by a constant value.
We report a deep-mid-IR femtosecond OPO based on CdSiP2 using direct synchronous pumping by a Ti:sapphire laser, providing continuous wavelength coverage across 6–8 μm under rapid static cavity delay tuning with high output stability.
High-power (110mW) mid-IR output suitable for ultra-broadband frequency comb generation was produced in a low-threshold (20mW) subharmonic GaAs optical parametric oscillator that was synchronously pumped (175MHz) by a compact 0.5-W femtosecond Cr:ZnS (2.38μm) oscillator.
We report a cw mid-infrared source based on OP-GaAs, tunable across 6460–7517nm, providing 51.1mW at 6790nm, with passive power stability of ∼2.3% rms (>1 hour) and frequency stability of 1.8GHz (>1 minute), in high-beam quality.
Recently, we demonstrated extremely low threshold optical parametric generation (OPG) pumping a CdSiP2 (CSP) crystal with 500-ps-long pulses from a Nd-laser system [1]. Diode laser seeding enabled narrow-band non-critical OPG operation at 1–10 kHz repetition rate with the idler at ∼6100 nm. In comparison to [2], with a simpler Q-switching based pump system, a 4-fold improvement of the time-bandwidth...
We demonstrate second harmonic generation at 1621 nm in a low-loss orientation-patterned GaAs waveguide pumped by an optical parametric oscillator system. The losses were estimated to be 2.12 dB/cm.
We report a compact, efficient, 1.5 mJ, 450 MHz, mid-IR picosecond OPO based on CdSiP2, synchronously-pumped at 1064 nm, covering the technologically important wavelength range of 6091–6577 nm for surgical applications.
We report a high-energy picosecond optical-parametric-generator tunable over 6153–6732 nm in the mid-infrared, 1264–1286 nm in near-infrared, providing ∼600 μJ of output energy over entire signal-tuning-range, >25μJ of idler energy over 55% of the idler-tuning-range.
We demonstrate a 500 MHz ultra-low noise 58fs Tm fiber soliton laser based on carrier phase noise reduction with an electro-optic graphene modulator. The system is used for pumping a doubly resonant OP-GaAs OPO for coherent mid IR generation.
The influence of the pump intensity profile on the performance of a mid-IR ZGP RISTRA OPO at 6.45 µm is studied for a flat-top pump profile and compared to a Gaussian pump distribution at the same pump peak fluence of 0.81 J/cm2. Due to a coherent beam transformation a flat-top pump beam with a plane wavefront and excellent beam quality of M2≈1.25 is generated. The output of up to 5 mJ pulse idler...
We report parametric generation of near- and mid-infrared picosecond pulses at 100 kHz in CdSiP2 pumped at 1.064 µm, providing 154 mW of idler at 6.204 µm and 1.16 W of signal at 1.282 µm.
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