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
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.
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Specification
Specifications DFC CORE + Center wavelength 1560 nm (other wavelengths 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 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 kHz)* 10 kHz, optimal with DFC RF Stability 8 · 10-18 in 1s *, 5 · 10-20 in 1000 s* 1 · 10-13 in 1 s** Accuracy 1 · 10-18 for τ > 100 s* 1 · 10-14 for τ > 100 s** Bandwidth piezo frep > 50 kHz Reference Optical reference*** or DFC RF***, Low-noise oven-controlled quartz (OCXO) Reference input · 800 MHz for RF reference
· 10 MHz with DFC RF
· High bandwidth Imod (DC - 10 MHz) for optical referenceDimensions (H x W x D) 133 x 450 x 633 mm³, incl. electronics Cooling requirements Air cooled Power consumption < 110 W Operating temperature 21 ± 4 °C Weight < 32 kg Power supply Mains connection: 100 .. 240 V~, 50/60 Hz, 4.0 A, Power adaptor output: 220 W, 24 V/9.2 A Control computer Laptop, Windows operating system, English * Phase-locked to optical reference, ** Phase-locked to RF reference, *** not included -
Options
Options Module Description Wavelength extension* DFC IR Centered @ 1560 nm, bandwidth > 80 nm, typ. 100 nm DFC NIR Centered @ 780 nm, bandwidth > 35 nm, typ. 40 nm DFC DVIS** Wavelength range 420 (frep = 80 MHz), 450 (frep = 200 MHz) - 860 nm,
bandwidth typ. 5 nm @ 698 nm, typ. 1 nm @ 420 nmDFC SCNIR** Wavelength range 840 nm (frep = 80 MHz), 860 nm (frep = 200 MHz) - 980 nm,
bandwidth > 50 nm, typ. 100 nm @ 935 nmDFC SCIR** Wavelength range 980 - 2000, bandwidth > 150 nm Reference DFC RF 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 Beat units
DFC BC Beam combiner for DFC and cw-laser, fiber coupled DFC BCF Fiber beam combiner for DFC and cw-laser, 980 nm, 1030 nm, 1300 nm, 1550 nm DFC MD Monochromatic detector unit, fiber coupled, use with DFC BC / DFC BCF Locking electronics FALC Fast analog 2-channel PID PFD Phase frequency detector, enables remote locking with FALC DLC EXT Housing and power supply for FALC and PFD Accessories DFC SCOPE Digital oscilloscope with spectrum analyzer (FFT), for beat monitoring up to 4 beats DFC COUNT 4 channel counter WS8-30 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 +) * other extensions on request, ** tunable (patent protected, US 8284808B2), please inquire for more details -
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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