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- resistivity of our GaP crystals is around 10^7 Ohm x cm
- Phasematched Difference Frequency Generation to Produce Terahertz FrequencyLocal OscillatorsGregory S. HermanScience Applications International Corporation1 Enterprise Parkway, Suite 300Hampton, Virginia, 23508Stephen P. SandfordNASA Langley Research Center, M/S 468Hampton, Virginia, 23681We are investigating high-resistivity, undoped Gal) crystal as a useful nonlinear optical material for producing terahertz frequency local oscillators using nonlinear optical frequency conversion, a.k.a. laser mixing. Diffusion-bonded stacked (DBS) crystal structures are being developed for quasi-phasematched nonlinear optical frequency conversion from Near-Infrared (NIR) to Far- Infrared (FIR) wavelengths. Sellmeier equations predict coherence lengths for this interaction in GaP to be approximately 960 micrometers. To increase conversion efficiency, a resonantly enhanced difference-frequency generation scheme is being employed.At NASA Langley Research Center, a system is being developed whereby a small percentage of the pump and signal laser energy (1064 nm and 1074 nm, respectively) is diverted and used to actively frequency-lock the pump and signal lasers to adjacent longitudinal modes of an ultrahigh finesse Fabry-Perot reference cavity, thereby greatly enhancing their relative stability. Frequencystability measurements made at NASA Langley with low power lasers using Pound-Drever-Hall locking combined with a new cavity locking technique have demonstrated submillihertz linewidths. The majority of the pump and signal laser energy is than coupled into an external cavity that surrounds the DBS GaP structure to build up the field intensity at the pump and signal wavelengths while the idler wave (118 micrometers) is coupled out.Tuning must be made in increments of the free spectral range of the reference cavity (-3 GHz). Tuning between resonances can be achieved by altering the length of the reference cavity. Depending on the desired system efficiency, frequency-stability, and complexity, the signal laser can either be another Nd:YAG laser operating at 1074 nm (for the 2.5 terahertz OH line), a diode pumped solid-state laser with a different host material, such as GSGG, or a 532-pumped optical parametric oscillator, operating near degeneracy, which could achieve continuous tuning from 100 GHz to 3.0 THz.http://www.nrao.edu/meetings/isstt/papers/1997/1997436000.pdf
- New item - sales@dmphotonics.comGaP single crystal prism and rectangle
- NEW ITEM - sales@dmphotonics.comTGS Triglycine Sulfate, DTGS Deuterated Triglycine SulfateWater-soluble Triglycine Sulfate crystals have technological importance for room-temperature IR detectors, earth exploration, radiation monitoring and astronomical telescopes. TGS is the best material used as a sensitive element in pyroelectric sensors due to its high pyroelectric coefficient, reasonably low dielectric constant, and the best quality factor. Pyroelectric sensors based on TGS are uniformly sensitive to radiation in wavelength range from UV to far IR and do need in cryogen cooling for operation.Using of deuterated DTGS crystals allows to extend the temperature range of sensing due to their higher Curie temperature.
- NEW ITEM - sales@dmphotonics.com ATGS, ADTGS Triglycine Sulfate doped with Alpha-alanineWater-soluble Triglycine Sulfate crystals have technological importance for room-temperature IR detectors, earth exploration, radiation monitoring and astronomical telescopes. TGS is the best material used as a sensitive element in pyroelectric sensors due to its high pyroelectric coefficient, reasonably low dielectric constant, and the best quality factor. Pyroelectric sensors based on TGS are uniformly sensitive to radiation in wavelength range from UV to far IR and do need in cryogen cooling for operation.Using of deuterated DTGS crystals allows to extend the temperature range of sensing due to their higher Curie temperature.Doping with Alpha-alanine significantly improves and regulates domain structure and also transforms material to ferroelectric
- GaP crystal part number GaP_10_10_0.1 - request a quotefreestanding 0.1 mm GaP (CR-GaP-10-10-0.1) - usually available in stock (without mount or mounted in dia.25.4 mm holder)GaP <110> crystal with a thickness of 100 micronAperture, mm 10 x 10 +/-0.1Thickness, mm 0.1 +/-10%Orientation 110Surface quality, scr-dig 40-20Flatness, waves at 633 nm - 1 lambdaParallelism, arc min < 3http://www.dmphotonics.com/GaP_crystal/GaP%20110%20crystal%20with%20a%20thickness%20of%20100%20micron%20optically%20contacted%20on%20%20GaP%20100%20sustrate%20with%20a%20thickness%20of%202mm.htm
- GaP <110> crystal with a thickness of 200 micron optically contacted on GaP <100> sustrate with a thickness of 3mmhttp://www.dmphotonics.com/GaP_crystal/GaP_crystal.htm
- New thin GaP crystals from stock!GaP, (110) cut, 10x10 mm aperture ,both sides polished, unmounted0.1 thick plates - request a quote0.05 thick plates - request a quotehttp://www.dmphotonics.com/GaP_crystal/GaP%20crystal,%20(110)%20cut,%2010x10%20mm%20aperture,%2050%20micron%20thick.htm
- GaP crystal, 110-cut, 5x5x0.1 mmhttp://greyhawkoptics.com/product_info.php?cPath=32_94&products_id=393&osCsid=e520037cd19fdfb7647befe88de8d710
- in stock:GaP crystal, 110-cut, 10x10x0.1 mmhttp://greyhawkoptics.com/product_info.php?products_id=400&osCsid=e520037cd19fdfb7647befe88de8d710
- Broadband Terahertz Pulses Generated by a Compact Femtosecond Photonic Crystal Fiber Amplifier.http://ull.tju.edu.cn/wp-content/uploads/2010/08/Broadband-Terahertz-Pulses-Generated-by-a-Compact-Femtosecond-Photonic-Crystal-Fiber-Amplifier1.pdf