We review progress in quasi-phase-matched optical parametric oscillators bulk periodically poled LiNbO3. Using the electric-field poling process, we can reliably fabricate 0.5-mm-thick crystals with uniform domain structures over a 15-mm length. Periodically material retains low-loss and power handling properties of single-domain LiNbO3, quasi phase matching permits noncritical d33, highest-valued nonlinear coefficient. Optical pumped by 1.064-μm pulsed Nd:YAG lasers have been operated...

Both absolute and relative nonlinear optical coefficients of six materials measured by second-harmonic generation are discussed. A single-mode, injection-seeded, Q-switched Nd:YAG laser with spatially filtered output was used to generate the 1.064- mu m fundamental radiation. The following results were obtained: d/sub 36/(KD*P)=0.38 pm/V, 36/(KD*P)=0.37 mod 22/(BaB/sub 2/O/sub 4/) =2.2 31/(LiIO/sub 3/)=-4.1 31/(5%MgO:MgO LiNbO/sub 3/)=-4.7 eff/(KTP)=3.2 pm/V. accuracy these measurements is...

Accurate index of refraction measurements have been performed in flux-grown KTiOPO4. These give good agreement between experiment and theory for angle phase matching Type II second harmonic generation at 1.064 μm. refractive-index data allowed us to calculate the propagation angles wavelengths interest other than μm such as 1.34 energy conversion efficiency up 59% this material has also demonstrated with higher efficiencies possible. Limits are discussed.

We report a widely tunable quasi-phase-matched optical parametric oscillator that uses periodically poled LiNbO3 with multigrating structure. The device is tuned by translation of the crystal through resonator and pump beam, no realignment needed. With 1.064-μm acousto-optically Q-switched Nd:YAG laser, we produced noncritically phase-matched IR output from 1.36 to 4.83 μm. threshold was 6 μJ for 26-mm interaction length. extraordinary polarization has better transmission than does ordinary...

We report a quasi-phase-matched optical parametric oscillator, using bulk periodically poled LiNbO(3). The pumped by 1.064-microm Q-switched Nd:YAG laser, was temperature tuned over the wavelength range 1.66-2.95 microm. oscillation threshold of approximately 0.1 mJ more than factor 10 below damage limit. LiNbO(3) crystal, fabricated application an electric field to sample with liquid and metal surface electrodes, 0.5 mm thick 5.2-mm interaction length period 31

The frequency-tuning and -control properties of monolithic doubly resonant optical parametric oscillators are analyzed for stable single-mode pump radiation. Single-axial-mode operation is observed on the idler signal both pulsed continuous pumping. Projections made tuning-parameter tolerances that required maintenance single-frequency oscillation. Continuous frequency tuning possible through simultaneous adjustment two or three parameters; thus synthesis specific frequencies within broad...

We report the first operation of an optical parametric oscillator in a chalcopyrite crystal, AgGaS2. Tuning from 1.4 to 4.0 μm is demonstrated for 1.06-μm Nd:yttrium aluminum garnet pumping. The potential tuning range extends 12-μm transparency limit crystal.

We report new experimental results on the spectral, thermal, and orientational characteristics of stoichiometry-dependent mid-IR absorption in AgGaSe(2) crystals. In currently available material, this poses an obstacle to power scaling 2-µm-pumped optical parametric oscillator (OPO). Preliminary experiments have indicated that could be substantially reduced by optimization process parameters during crystal growth annealing. OPO output powers approaching 10 W may achievable using optimized material.

-A discussion of second harmonic generation with imperfect phase matching in the high conversion limit is presented. Phase modulation fundamental pulse, dispersion, central frequency wavevector mismatch, and depletion are included. The results show that even small amounts or mismatch can must be considered at efficiency. Both spatial temporal parameters more restrictive efficiency because narrowing peak. If process overdriven, severe distortion transmitted pulses result. Cascade neodymium...

The authors have fabricated a diffusion-bonded monolithic stack of GaAs plates for quaa-phase-matched second-harmonic generation 10.6 μm CO2 laser. This synthetic nonlinear crystal retains the thermomechanical properties bulk material, and has provided phase coherent interaction over ∼0.4cm.

The first successful operation of a AgGaSe2 infrared parametric oscillator is reported. Continuous tuning ranges 1.6–1.7 μm, 6.7–6.9 and 2.65–9.02 μm were achieved using 1.34-μm neodymium 2.05-μm holmium pump lasers. Pulse energies exceeding 3 mJ, peak powers near 100 kW, conversion efficiencies 18% obtained. Operation the was possible well below 13–40 MW/cm2 surface damage threshold this nonlinear material.

A visible BaB2O4 optical parametric oscillator (OPO) pumped by a single-axial-mode 355-nm source has been demonstrated. An average output power of 140 mW with signal wave conversion efficiency 13% and an idler 11% for total 24% achieved. The continuously tuned from 412 nm to 2.55 μm limited the infrared transmission range crystal. Through injection seeding we obtained OPO operation corresponding linewidth less than 3 GHz.

Results of experimental studies the generation coherent radiation in XUV by high order optical nonlinearities rare gases are described. Fifth- and seventh-harmonic conversion six wave mixing harmonic pulses from an Nd:YAG laser were used to produce at several discrete wavelengths between 38 76 nm. Experimental measurements fifth-haxmonic pump 266.1 nm helium compared with theoretical predictions. Discrepancies theory experiment observed powers, role competing processes is discussed.

The 2012 Data Fusion Contest organized by the Technical Committee (DFTC) of IEEE Geoscience and Remote Sensing Society (GRSS) aimed at investigating potential use very high spatial resolution (VHR) multi-modal/multi-temporal image fusion. Three different types data sets, including spaceborne multi-spectral, synthetic aperture radar (SAR), airborne light detection ranging (LiDAR) collected over downtown San Francisco area were distributed during Contest. This paper highlights three awarded...

We report what is to our knowledge the first demonstration of a continuous-wave singly resonant optical parametric oscillator based on potassium titanyl phosphate. The pump source used single-frequency resonantly doubled Nd:YAG laser. By double passing through crystal, we achieved minimum oscillation threshold 1.4 W. With 3.2 W incident power, maximum 1.07 nonresonant idler power was generated. Spectral measurement reveals that operates consistently in single axial mode with much relaxed hop...

Second harmonic generation of mode-locked pulses in ADP and KD*P from 532 to 266 nm with 85% conversion is reported. Two-photon absorption coefficients are measured for the two materials found be relatively unimportant limitation compared effects phase mismatch dispersion.

A new technique for measurement of picosecond light pulses is described using the unique polarization properties optical third harmonic generation. width half-maximum intensity less than 0.73 psec observed a mode-locked neodymium glass laser.

This study presents a method for the reconstruction of pixels contaminated by optical thick clouds in multi-spectral Landsat images using multi-frequency SAR data. A number techniques have already been proposed scientific literature. However, all existing certain limitations. In order to overcome these limitations, we expose Closest Spectral Fit (CSF) Meng et al. new, synergistic approach and Therefore, term Feature Vector (CFV) is introduced. The technique facilitates an elegant way avoid...

Experimental results of the first BaB/sub 2/O/sub 4/ optical parametric oscillator (OPO) are presented. The pump source was second harmonic output a Q-switched TEM/sub 00/ mode Nd:YAG laser. OPO had 1 mJ energy with peak power 80 kW in tuning range from 0.94 to 1.22 mu m.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

AgGaSe2 crystals for nonlinear infrared applications are being grown reproducibly. Using high-quality, 2-cm-long crystals, 14% energy and 60% peak intensity conversion efficiency have been demonstrated second harmonic generation of the pulsed output a CO2 miniature transversely excited atmospheric laser.

The nonlinear optical properties of β-BaB204 (beta barium borate) are demonstrated in the generation second through fifth harmonics 1.06 μm neodymium laser radiation and parametric oscillation pumped by 532-nm radiation. βBaB204 is particularly useful for high average power applications frequency ultraviolet to wavelengths as short 200 nm. An internal energy conversion efficiency 84% 1064-nm harmonic generation, cascaded 213-nm with 11% overall were obtained. observed performance agrees well...

The generation of coherent radiation 53.2 nm by fifth-harmonic conversion laser pulses at 266.1 in both Ne and He is reported.Received 14 September 1976DOI:https://doi.org/10.1103/PhysRevLett.37.1540©1976 American Physical Society

Seventh harmonic generation in helium is used to produce coherent light at 38 mm from laser pulses 266.1 nm. The variation of both the fifth and seventh signals with pressure described.

We demonstrate that a single short pulse of laser irradiation appropriate energy is capable recrystallizing in open air an amorphous Si layer deposited on (100) single-crystal substrate into epitaxial layer. The annealing technique shown to overcome the interfacial oxide obstacle which usually leads polycrystalline formation normal thermal annealing.

A monolithic doubly resonant optical parametric oscillator (OPO) fabricated from MgO:LiNbO3 was pumped by a cw, frequency-doubled, diode-laser-pumped Nd:YAG laser. The threshold for cw operation 12 mW, and pump depletions of up to 78% were observed two times above threshold. total OPO output power 8.15 with conversion efficiency the incident 34% combined 1064-nm laser light 14%. temperature tuned 1007 1129 nm, operated on single-axial-mode pair over most range, could be electric field as...