By exploiting nonlinear optical effects, a technology of unprecedented flexibility for the production tunable coherent light has been developed. Referred to as parametric generation, it provides sources with spectral coverage extending all way from ultraviolet mid-infrared, and temporal over time domains femtosecond pulse continuous wave. Such generate outstanding quality are now finding wide-ranging applications.

In this work we demonstrate, to the best of our knowledge, a novel wide field-of-view upconversion system, supporting monochromatic mid-infrared (mid-IR) images, e.g., for hyperspectral imaging (HSI).An optical parametric oscillator delivering 20 ps pulses tunable in 2.3-4 μm range acts as mid-IR illumination source.A standard CCD camera, synchronism with crystal rotation acquires only 2.5 ms upconverted images containing 64 kpixels, thereby eliminating need postprocessing.This approach is...

Characteristics of high-power, narrow-linewidth, continuous-wave (cw) green radiation obtained by simple single-pass second-harmonic-generation (SHG) a cw ytterbium fiber laser at 1064 nm in the nonlinear crystals PPKTP and MgO:sPPLT are studied compared. Temperature tuning SHG power scaling up to nearly 10 W for input fundamental levels 30 performed. Various contributions thermal effects both crystals, limiting conversion efficiency, studied. Optimal focusing conditions management schemes...

We report a femtosecond optical parametric oscillator (OPO) based on the nonlinear material BiB3O6. The OPO is synchronously pumped in blue by second harmonic of Kerr-lens-mode-locked Ti:sapphire laser. It can provide wide and continuous tuning across entire green-yellow-orange-red spectral range with single crystal set mirrors. Using 500 microm BiB3O6 collinear type I (e+e->o) phase matching yz plane, signal wavelength 480-710 nm demonstrated angle at room temperature average output powers...

We report a tunable, high-energy, single-pass optical parametric generator (OPG) based on the nonlinear material, cadmium silicon phosphide, CdSiP(2). The OPG is pumped by cavity-dumped, passively mode-locked, diode-pumped Nd:YAG oscillator, providing 25 µJ pulses in 20 ps at 5 Hz. pump energy further boosted flashlamp-pumped amplifier to 2.5 mJ. temperature tunable over 1263-1286 nm (23 nm) signal and 6153-6731 (578 idler. Using configuration, we have generated pulse as high 636 1283 nm,...

Controlled switching of orbital angular momentum (OAM) light at practical powers over arbitrary wavelength regions can have important implications for future quantum and classical systems. Here we report on a single source OAM beams based an optical parametric oscillator (OPO) that provide all such capabilities. We demonstrate active transfer modes any order, |lp|, pump to the signal idler in OPO, produce |lp|+1 different states by controlling relative cavity losses resonated beams. As...

We report a femtosecond optical parametric oscillator (OPO) for the mid-infrared (mid-IR), generating record average power of 110 mW at 7 μm. The OPO, based on CdSiP(2) (CSP) as nonlinear crystal, provides idler wavelength tuning across 6540-7186 nm with spectral bandwidths >400 -10 dB level over entire range, and maximum bandwidth 478 6.9 To best our knowledge, this is highest generated from OPO in deep mid-IR. also near-IR signal wavelengths tunable 1204-1212 usable 450 418-fs pulses 1207...

We describe the evolution of ultrafast optical parametric sources for mid-infrared (mid-IR) based on new birefringent nonlinear crystal, cadmium silicon phosphide, CdSiP2, using well-established Nd-based solid-state and Yb-based fiber pump lasers near 1 μm. Optical generators oscillators (OPOs) providing high-energy picosecond pulses, as well high-repetition-rate femtosecond at high average powers across 6–7 μm spectral range in mid-IR are described detail. Studies viable laser technologies...

Efficient generation of tunable femtosecond pulses in the blue is reported nonlinear crystal BiB3O6. By use fundamental from a mode-locked Ti:sapphire laser at 76 MHz, single-pass second-harmonic average powers as much 830 mW have been generated 50% conversion efficiency, and range 375-435 nm demonstrated. Temporal measurements using cross correlation 100-microm-thick beta-BaB2O4 result pulse durations 220 fs for 130-fs pulses. Direct experimental comparison with confirms superior performance BiB3O6

The authors report efficient third harmonic generation of microjoule picosecond pulses at 355nm in the nonlinear optical material BiB3O6. Using two crystals BiB3O6 cut for type I (e+e→o) phase matching yz plane second and fundamental from a mode-locked, amplified Nd:YAG laser 1.064μm, they have achieved conversion efficiencies as much 50% 355nm. Third pulse energies up to 216μJ 29ps 25Hz repetition rate been obtained 35ps pulses. They also determined magnitude two-photon absorption...

A watt-level, single-frequency, continuous-wave (cw) singly resonant optical parametric oscillator (OPO) based on MgO:sPPLT is described. Pumped in the green by a frequency-doubled cw diode-pumped Nd:YVO(4) laser at 532 nm, OPO can provide up to 1.59 W of single-frequency idler output with linewidth ~7 MHz pump depletions as much 67%. Using compact ring resonator and optimized focusing 30 mm crystal, oscillation threshold 2.84 has been obtained under single-pass pumping. With single grating...

We report a high-power, widely tunable, cw singly resonant optical parametric oscillator (OPO) based on MgO:sPPLT. The OPO is pumped in the green by diode-pumped Nd:YVO(4) laser at 532 nm and can provide continuously tunable output across 848-1430 nm. Using 30 mm crystal double-pass pumping, an oscillation threshold of 2.88 W has been obtained, single-pass idler powers excess 1.51 have generated over 1104-1430 for 6W pump power extraction efficiency 25.2% photon conversion 56.7%.

We present a stable, high-power, cw, single-frequency green source in compact and practical design based on simple single-pass second-harmonic generation of cw ytterbium fiber laser at 1064 nm MgO-doped periodically poled stoichiometric LiTaO(3). Using 30-mm-long crystal containing single grating, we have generated 9.64 W radiation 532 with fundamental power 29.5 conversion efficiency 32.7%. The output is naturally stable peak-to-peak fluctuation 7.6% over the first 8 h 9% 13 h. Over entire...

We describe the critical design parameters and present detailed experimental theoretical studies for efficient, continuous-wave (cw), single-pass second harmonic generation (SHG) based on novel cascaded multicrystal scheme, providing >55% conversion efficiency multiwatt output powers at 532 nm a wide range of input fundamental 1064 nm. Systematic characterization technique in single-crystal, double-crystal schemes has been performed results are compared. Optimization vital including focusing...

We report a compact and viable source of broadband, high-power, cw, mid-IR radiation based on singly resonant optical parametric oscillator (SRO) pumped by wide-bandwidth cw Yb fiber laser centered at 1060 nm. By exploiting the extended phase-matching bandwidth in 50 mm crystal MgO:PPLN ring SRO cavity, we obtain 5.3 W broadband idler output for 25.5 pump >80% depletion, transferring 73.9 cm(-1) to an spectrum spread across equal 3454 deploying coupling signal, generate 11.2 total power 44%...

We report the first, to best of our knowledge, femtosecond-laser-pumped optical parametric oscillator (OPO) based on newly developed nonlinear crystal, CdSiP2. The OPO was synchronously pumped by a mode-locked Yb:KYW/Yb:fiber master-oscillator power amplifier, providing 1.053 μm pump pulses with durations 130 fs at repetition rate 100 MHz. 0.5-mm-thick CdSiP2 crystal cut for type-I noncritical interaction, broad phase-matching bandwidth and ensuring excellent temporal overlap among pump,...

We describe a compact all-solid-state continuous-wave singly resonant optical parametric oscillator (SRO) with minimal pump-power requirement. The SRO is based on periodically poled LiNbO3 as the nonlinear material and pumped by 1-W diode-pumped Nd:YVO4 minilaser at 1.064 µm. By exploiting intracavity pumping technique in 50-mm crystal, we have achieved operation threshold diode pump power of only 310 mW. At 1 W input power, delivers 70 mW output nonresonant idler 3.66 µm, photon conversion...

We report the observation of second-harmonic generation by type I quasi phase matching in a GaAs-AlAs superlattice waveguide. Quasi was achieved through modulation nonlinear coefficient chi((2))(zxy), which we realized periodically tuning bandgap. Second-harmonic demonstrated for fundamental wavelengths from 1480 to 1520 nm, third-order gratings with periods 10.5 12.4microm . The signal spectra narrowing owing finite bandwidth quasi-phase-matching grating. An average power ~110 nW obtained...

We report optical second-harmonic generation (SHG) through modal phase matching in GaAs/AlGaAs semiconductor waveguides. Using femtosecond pulses, both type-I and type-II SHG is demonstrated for fundamental wavelengths near 1.55 μm.

We report efficient generation of high-power, cw, single-frequency radiation in the green a simple, compact configuration based on single-pass, second-harmonic cw ytterbium fiber laser at 1064 nm periodically poled KTiOPO(4). Using crystal containing 17 mm single grating with period 9.01 microm, we generate 6.2 W 532 for fundamental power 29.75 single-pass conversion efficiency 20.8%. Over entire range pump powers, generated output is frequency linewidth 8.5 MHz and has TEM(00) spatial...

We report efficient generation of tunable femtosecond pulses in the ultraviolet (UV) by intracavity doubling a visible optical parametric oscillator (OPO). The OPO, based on 400 μm BiB3O6 crystal and pumped at 415 nm blue, can provide signal across 500-710 nm. Using 500 β-BaB2O4 internal to OPO cavity, frequency into UV is achieved, providing 250-355 with up 225 mW average power 76 MHz. Cross-correlation measurements result durations down 132 fs for 180 blue pump pulses.