{"product_id":"ufi-gobi","title":"GOBI — White Light Interferometer for GDD (VIS\/NIR, 400–1060 nm)","description":"\u003cp\u003e\u003cstrong\u003eOur White Light Interferometer GOBI uses spectrally resolved interferometry to accurately measure the Group Delay Dispersion (GDD) of multi-layered ultrafast optics.\u003c\/strong\u003e The device has been developed at the Max-Planck-Institute of Quantum Optics (Garching, Germany) to characterize and refine some of the most advanced coatings to date.\u003c\/p\u003e\n\u003cp\u003eCombining spectral with temporal information and the possibility to accumulate multiple passes over the same optic ensures reliable results. Spectrally resolved detection makes reference lasers — together with any related test-sample restrictions on specific reflection or transmission bands — obsolete. This opens the full spectral range to characterize even ultra-broadband or advanced narrowband coatings. The flexible optical setup can measure mirrors and transparent samples under angles of incidence variable between 0 and 70 degrees.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGOBI (VIS\/NIR basic version)\u003c\/strong\u003e covers 400–1060 nm with 1 nm spectral accuracy — the standard configuration for characterizing ultrafast optics across the visible and near-infrared, including pulse-compression mirrors, chirped mirrors, dichroics and dispersive coatings designed for Ti:Sapphire, Yb-based and broadband oscillators \/ amplifiers.\u003c\/p\u003e\u003ch3\u003eKey Product Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDirect spectrally dispersed measurement with a spectrometer\u003c\/li\u003e\n\u003cli\u003eNo need for reference lasers, no requirements on specific reflectivity\u003c\/li\u003e\n\u003cli\u003eUltrabroad spectral coverage — see Specifications tab for the three available versions\u003c\/li\u003e\n\u003cli\u003es and p polarization measured separately\u003c\/li\u003e\n\u003cli\u003eAngle of incidence: 0° and 5–70°\u003c\/li\u003e\n\u003cli\u003eMeasurement of single mirrors or mirror pairs\u003c\/li\u003e\n\u003cli\u003eLaptop and user-friendly software interface included\u003c\/li\u003e\n\u003cli\u003eCompact 45 × 45 cm² footprint\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWorking Principle\u003c\/h3\u003e\n\u003cp\u003eGOBI is based on a Michelson interferometer with an incoherent white light (WL) source. Data is acquired by scanning the delay of one arm and spectrally recording the evolving interference pattern. Fully automated analysis yields the spectral phase and GDD. The spectrometer directly provides the spectrally-resolved information, avoiding artefacts from time-domain reconstruction; it also provides an intrinsic calibration reference for the delay scan, so that no additional reference lasers are required. This makes GOBI suitable for any optics measurements in the detection range without the need to cover a reference laser wavelength in transmission or reflectance.\u003c\/p\u003e\u003ch3\u003eSample Measurements\u003c\/h3\u003e\n\u003cp\u003eIn contrast to other devices, GOBI is able to resolve strong GDD oscillations. Examples of GDD measurements compared with theoretical design include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltrabroadband PC70 mirrors\u003c\/strong\u003e — UFI's unique double-angle design, measured at 5° and 19° angle of normal incidence, together with the average.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulse-compression mirror PC1921\u003c\/strong\u003e — for the infrared.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-dispersive HD73 mirror\u003c\/strong\u003e — −3000 fs² per bounce at 1030 nm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: differences between measured and theoretical curves reflect tolerances in the manufacturing process of the coatings.\u003c\/p\u003e\u003ch3\u003eReferences\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eM. Th. Hassan et al., \"Optical attosecond pulses and tracking the nonlinear response of bound electrons,\" \u003cem\u003eNature\u003c\/em\u003e \u003cstrong\u003e530\u003c\/strong\u003e, 66–70 (2016).\u003c\/li\u003e\n\u003cli\u003eE. Fedulova et al., \"Highly-dispersive mirrors reach new levels of dispersion,\" \u003cem\u003eOptics Express\u003c\/em\u003e \u003cstrong\u003e23\u003c\/strong\u003e (11), 13788–13793 (2015).\u003c\/li\u003e\n\u003cli\u003eV. Pervak, \"Recent development and new ideas in the field of dispersive multilayer optics,\" \u003cem\u003eApplied Optics\u003c\/em\u003e \u003cstrong\u003e50\u003c\/strong\u003e (9), C55–C61 (2011).\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"UltraFast Innovations","offers":[{"title":"Default Title","offer_id":48038455476378,"sku":null,"price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/UFI_GOBI_0b9448cc-301a-4766-a988-63951adb94ea.jpg?v=1778980925","url":"https:\/\/waveqvanta.com\/products\/ufi-gobi","provider":"WaveQuanta","version":"1.0","type":"link"}