DFC CORE +
Difference Frequency Comb – DFC
- Comb spacing: 80 MHz or 200 MHz
- Stability: 8 · 10-18 in 1 s*, 5 · 10-20 in 1000 s*
- Accuracy: 1 · 10-18 for τ > 100 s*
- Integrated phase noise fCEO: < 65 mrad [70 mHz - 20 MHz]
- Linewidth: < 1 Hz (locked to optical reference)
- Turn-key, full remote control
- Patented CERO (“zero-fCEO”) technology
* Phase-locked to optical reference
The DFC CORE + is a robust, 19 inch compatible optical frequency comb based on Erbium fiber technology. It is the core system for applications like optical clocks, micro wave generation or phase-locking of cw-lasers and can be equipped with additional wavelength extensions and options. Its unique fCEO-stabilization is based on Difference Frequency Generation (DFG) and comes with many advantages such as high robustness and ultra-low phase noise. The DFC CORE + features an outstanding stability and accuracy which is suitable for use with the best optical clocks. More than 20 years of engineering experience building high-quality scientific and industry-grade lasers went into its design, it’s a true TOPTICA laser.
Request a Quotation Application Note Phase and Frequency Locking of Diode Lasers Watch the webinar Download the product brochure
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Specification
Specifications DFC CORE + Center wavelength 1560 nm (420 nm .. 2000 nm available via extensions, see DFC Extensions) Comb spacing 200 or 80 MHz Laser outputs 4 or 8, fiber coupled, polarization maintaining, FC/APC Bandwidth > 20 nm, each output Power > 10 mW, each output Offset frequency fCEO
fCEO = 0, by passive stabilization via difference frequency generation Integrated phase noise fCEO < 40 mrad [100 Hz .. 2 MHz], < 65 mrad [70 mHz .. 20 MHz] Linewidth < 1 Hz * Loop bandwidth frep lock > 400 kHz (typ. 450 .. 500 kHz)* 10 kHz, optimal with DFC RF Stability*³ 8 · 10-18 in 1s *, 5 · 10-20 in 1000 s* 1 · 10-13 in 1 s*² Accuracy 1 · 10-18 for τ > 100 s* 1 · 10-14 for τ > 100 s*² Bandwidth piezo frep > 50 kHz Reference Optical reference*4 or RF reference*4 Dimensions (H x W x D) 133 x 450 x 633 mm³, incl. electronics Reference input · 800 MHz for RF reference
· 10 MHz with DFC RF
· High bandwidth Imod (DC .. 10 MHz) for optical referenceCooling requirements Air cooled (depending on system config. water cooling might be suggested or mandatory) Power consumption < 110 W Operating conditions 15 .. 24/28 °C (rel. humidity non-condensing)
(upper limit depends on system config.)Weight < 32 kg Power supply 100 .. 120 V / 220 .. 240 VAC, 50 .. 60 Hz (auto detect) Control computer Laptop, Windows operating system, English *Phase-locked to optical reference, *² Phase-locked to RF reference, *³ contribution of comb excl. reference, *4 optional -
Options
Module Description Frequency Comb DFC CORE + Difference Frequency Comb, 4 offset-free outputs @ 1560 nm, > 10 mW, > 20 nm DFC OPTION
8 OUTPUTS8 offset-free, CEP stable outputs at 1560 nm Wavelength extension DFC EXT Housing and power supply for DFC wavelength extensions DFC IR 1560 nm, high-power, short pulse, for details see Extension specs DFC SCIR 980 .. 2000 nm, 1560 nm, high-power, short pulse, for details see Extension specs DFC SCNIR 840 .. 980 nm, for details see Extension specs DFC NIR 780 nm, for details see Extension specs DFC VIS-L 640 .. 860 nm, for details see Extension specs DFC VIS-S 420 .. 640 nm, for details see Extension specs Beat units DFC BC Beam combiner (comb + cw laser), adjustable split ratio for comb and cw laser light,
free space or fiber-coupled outputDFC BCF Beam combiner fiber-coupled (comb + cw laser), fixed split ratio for comb and cw laser light,
fiber-coupled outputDFC MD Monochromatic detector unit, fiber-coupled, use with DFC BC / DFC BCF Locking electronics FALC Fast laser locking module, 2-channel PID PFD Phase frequency detector, enables remote locking with FALC MDFC LOCK Housing and power supply for up to three pairs of FALC and PFD DLC EXT Housing and power supply for one pair of FALC and PFD DFC LOCK UNIT Package of DLC EXT, FALC and PFD (one each) Reference DFC RF RF reference for DFC CORE+, low-noise oven-controlled quartz, output: 800 MHz, input: 10 MHz DFC GPS GPS frequency reference, output: 10 MHz, stability: 1.3 · 10-12 @ 1s, 1 · 10-13 @ 40000 s DFC DIST Low-noise 10 MHz Distribution Amplifier Accessories DFC SCOPE Digital oscilloscope with spectrum analyzer (FFT), for convenient beat monitoring from software DFC COUNT + 4 channel dead-time free counter MDFC ACCESS Housing and power supply for DFC Electronic Accessories WS7-30 HighFinesse wavelength meter, for convenient determination of comb line number Rack integration MDFC Rack integration of any DFC component and complete comb systems (e.g. MDFC CORE +) -
Applications
- Microwave Generation
- Laser Reference
- High-resolution Spectroscopy
- Dual-comb Spectroscopy
- Direct Frequency Comb Spectroscopy
- Interferometry
- Transportable AMO Systems
- Quantum Computing
- CEP-stable Seeders
- Rydberg Excitation (Rydberg Flyer for complete laser solutions)
- Flyer Optical Clocks
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Literature
- Scientific Article: E. Benkler et al., End-to-end topology for fiber comb based optical frequency transfer at the 10−21 level, Optics Express [27], 36886 (2019)
- Scientific Article: E. C. Cook et al., Resonant two-photon spectroscopy of the 2s3d 1D2 level of neutral 9Be Phys. Rev. Applied 101, 042503 (2020)
- Scientific Article: M. Collombon et al., Experimental Demonstration of Three-Photon Coherent Population Trapping in an Ion Cloud, Phys. Rev. Applied 12, 034035, (2019)
- Scientific Article: M. Collombon et al., Phase transfer between three visible lasers for coherent population trapping, Optics Letters Vol. 44, Issue 4 (2019)
- Scientific Article: A. Liehl et al., Ultrabroadband out-of-loop characterization of the carrier-envelope phase noise of an offset-free Er:fiber frequency comb. Optics Letters Vol. 42, Issue 10 (2017)
- Scientific Article: T. Puppe et al., Characterization of a DFG comb showing quadratic scaling of the phase noise with frequency, Optics Letters Vol. 41, Issue 8 (2016)
- Scientific Article: G. Krauss et al., All-passive phase locking of a compact Er:fiber laser system, Opt. Lett., 36, 540 (2011)
- Scientific Article: D. Fehrenbacher et al., Free-running performance and full control of a passively phase-stable Er:fiber frequency comb. Optica Vol. 2, Issue 10 (2015)
- Scientific Article: R. Kliese et al., Difference-frequency combs in cold atom physics, arXiv:1605.02426v1 (2016)
- Scientific Article: D. Brida et al., Ultrabroadband Er:fiber lasers, Laser & Photonics Review 8(3) (2014)
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