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- Germanium windows - new item sales@dmphotonics.comMaterial: Germanium optical gradeType: rectangular plano-plano windowDimensions: 45 x 48 mm (+/-0.1 mm)Thickness: 2 mm (+/-0.1 mm)Surface quality: 60/40 scr/digSurface accuracy: better 3 fringesParallelism: < 5 arc minClear aperture: > 90% of diameterCoating: AR/DLC at 8-12 micronsPart number: Ge_RPW_45_48_2_AR_DLC_8-12
- Germanium window, diam 25.4 mm x 3.0 mmGe optical gradeType: circular plane windowDiameter: 25.4 mm (+0.0/-0.2 mm)Thickness: 3 mm (+/-0.1 mm)Surface quality: 40/20 scr/digParallelism: 3 arc minutesClear aperture: 90% of diameterhttp://www.delmarphotonics.com/Germanium-Optics/Germanium-window-diameter-25_4.htm
- We have 3 options which are on the shelf and each has the 8-12 micron AR coating on them.GE-W-25-2-AR812 (25.4 mm dia x 2 mm thick) in stock - request a quote sales@dmphotonics.comGE-W-38-3-AR812 (38.1 mm dia x 3 mm thick) in stock - request a quote sales@dmphotonics.comGE-W-50-3-AR812 (50.8 mm dia x 3 mm thick) in stock - request a quote sales@dmphotonics.comhttp://www.dmphotonics.com/Germanium_windows_ARC8-12micron/Germanium%20windows%20with%208-12%20micron%20AR%20coating.htm
- Germanium etalon, diam 12.7 mm x 25.4 mm (diam 0.5" x 1")[E-Ge-12.7-25.4] http://greyhawkoptics.com/product_info.php?cPath=1_28&products_id=83&osCsid=e686d298fbee0014ef0005e84082e5ccGe_ET_1.00_0.50Ge (germanium) etalonType: Cylindrical plane etalonMaterial: Ge optical gradeDiameter: 0.50 (+/-0.05) inchLength: 1.00 (+/-0.01) inchFlatness: 1/4 lambda flat each end, HeNeParallelism: <= 5 arc seconds or better length measure to 0.0005" bevels Surface quality F-f(80/50)Bevels: Protective Bevel
- Germanium etalon, diam 1.25" x 3"[E-Ge-1.25-3] http://greyhawkoptics.com/product_info.php?cPath=1_28&products_id=86&osCsid=e686d298fbee0014ef0005e84082e5ccMaterial Ge optical gradeDiameter 1.5 inches Tolerance +/-0.05 inchLength 3 inches Tolerance +/-0.01 inchSurface quality 80/50 S/DFlatness lambda/4Clear aperture >90 % of diameterParallelism < 10 arc secCoating noneDel Mar Photonics offer variety of standard as well as custom germanium etalons.http://www.sciner.com/Opticsland/Germanium_Fabry_Perot_Etalon.htmGermanium Fabry Perot Etalon sales@dmphotonics.com Germanium Fabry Perot Etalon sales@dmphotonics.com
- Quantum Cascade Lasers CalibrationCustomer wrote:My application is calibrate the relative wavelength of tunable quantum cascade lasers in the mid-infrared (~10 microns). The laser itself is used for remote sensing of atmospheric gases.FSR (Free Spectral Range) is determined by etalon length L and wavelength of operation lambdaFSR= (lambda^2) / (2*n*L)The most popular standard etalon is 1 inch longFor longer wavelength (> 10 micron) it's often necessary to use etalons 2-3 inches long to get required accuracy of calibration.Del Mar Photonics offer variety of standard as well as custom germanium etalons.http://www.dmphotonics.com/Ge_etalon.htm
- Using Ge etalon in gas sensing project involving quantum cascade lasersJagadeeshwari (Esha) Manne, PhD student, University of AlbertaProject: Infrared absorption spectroscopy with Quantum cascade laser.The advance of Quantum cascade (QC) lasers fabricated by band structure engineering offers an attractive new option for IR absorption spectroscopy. QC-DFB lasers are of particular interest to gas-sensing applications because they emit single frequency radiation which falls within the 3-15 um window, where the fundamental absorption bands of most of the molecules are located. http://www.dmphotonics.com/DelMarPhotonics_News.htm
- Germanium etalon Part number: Ge_CPE_2.00_0.50 - request a quoteCommon specificationsType: Cylindrical plane etalonMaterial: Ge optical gradeDiameter: 0.50 (+/-0.05) inchLength: 2.00 (+/-0.01) inchFlatness: 1/4 lambda flat each end, HeNeParallelism: < 3 arc seconds or betterlength measure to 0.0005"Small bevelsSurface quality F-f(80/50) per MIL-F-48616Bevels: Protective Bevelhttp://www.dmphotonics.com/Germanium_etalon_110518/Germanium_etalon.htm
- Germanium Etalons for trace gas analysis sales@dmphotonics.comGermanium Etalons for trace gas analysis sales@dmphotonics.com
- A New Quantum-Cascade Laser Based Spectrometer for High-Precision Airborne CO2 MeasurementsRodrigo Jimenez et al. Harvard University – Department of Earth and Planetary SciencesWe present a new, compact, fast response mid-IR laser spectrometer for high-precision airborne measurements of CO2. The instrument is based on a thermoelectric-cooled, pulsed-operated DFB quantum-cascade (QC) laser. Unlike conventional cryogenically-cooled Pb-salt diode lasers, QC lasers display high mode purity and wavelength stability, and can be operated at near room temperature. This last attribute allows for a compact design and simplified operation.The CO2 concentration is derived from direct absorption dual-cell spectra obtained by electrical modulation at ~5-10 kHz of the laser wavelength across a selected ?3-band transition at around 4.3 ?m (typically 2311 or 2314 cm-1). The measurements are thus fully specific of the CO2 molecule and free from interference of H2O or other mid-IR light absorbers. Sample gas humidity is nevertheless reduced to less than ~100 ppmv in order to restrain density variation effects.Absorption spectra of the sample and a flowing standard (reference) along a 10-cm (or 5-cm) path are simultaneously detected by LN2-cooled InSbdetectors. The CO2 concentration difference is retrieved from the differential spectrum (sample/reference). The advantages of this “null” modeoperation are discussed in detail.The spectrometer includes a mechanism that allows directing the sample beam either to the cell or to a 25-mm Ge etalon for accurate wavelength tuning rate determination. Additional technical details are discussed, including the impact of laser linewidth on the linearity of the measurements.The spectrometer is enclosed in a temperature controlled, hermetically sealed vessel. The enclosure is flushed with CO2-free dry air previous operation in order to avoid light absorption in the external path. Details on the gas temperature, pressure, and flow rate controls are also presented.The demonstrated short-term precision of the instrument is better than ~75 ppbv Hz-1/2 (1-sigma in 1-s integration time) for CO2 concentrations within ±100 ppmv of the reference concentration. An accuracy of ±0.2 ppmv or better is insured through periodic calibration with high, low and “archival”http://www.dmphotonics.com/Germanium-Optics/Quantum-Cascade%20Laser%20Based%20Spectrometer%20CO2.htm