DFC BC / DFC BCF / DFC MD

Flexible beat detection units

Flexible beat detection units
Designed for use with DFC and DL pro
Stable and compact

TOPTICA's beat detection consists of two flexible modules: DFC BC (or DFC BCF) and DFC MD. Separating beam combination and beat detection into two units allows for placing them at different locations. The DFC BC and DFC MD units are specifically designed for a combination of the DFC with TOPTICA's DL pro tunable diode laser series, but can also be used with other cw lasers.

DFC BC
Beam Combiner

Beam combiner (comb + cw laser)
Adjustable split ratio for comb and cw laser light
Available from 420 to 2000 nm
Free space or fiber-coupled output
Comb-free cw output for experiment
Spectral operation range: approx. 100 nm (depends on central wavelength)
To be used in combination with DFC MD for beat detection
Dimensions (H x W x D): 49 x 100 x 100 mm³

DFC BCF
Beam Combiner Fiber

Beam combiner fiber-coupled (comb + cw laser)
Fixed split ratio for comb and cw laser light
Available split ratios for comb and cw laser:
90:10, 70:30, 50:50 (in %, others on request)
Available wavelengths (in nm):
780, 850, 935, 980, 1030, 1064, 1160, 1310, 1390, 1550 (others on request)
All-PM fibers (type depending on wavelength)
To be used in combination with DFC MD for beat detection
Dimensions (H x W x D): 23 x 90 x 200 mm³

DFC MD
Monochromatic Detector

Grating based tunable filter, 10 GHz bandwidth, < 1 GHz resolution
Low-noise photo diode for beat detection
Available from 420 to 2000 nm
RF output suitable as direct input for TOPTICA locking electroncis
Stand-alone narrow band frequency filter
Wavelength range 50 nm (depends on central wavelength)
Dimensions (H x W x D): 64 x 60 x 120 mm³
Measurement of the beat frequency using the beat monitoring unit of the DFC CORE module
Active locking of the cw laser to the DFC (requires additional locking electronics for the cw laser)
Locking of the DFC to the cw laser (requires DFC CORE+ version)

Request a Quotation Application Note Phase and Frequency Locking of Diode Lasers

Download the product brochure

Specification

	DFC BC	DFC BCF	DFC MD
Inputs	1. Frequency Comb: fiber-coupled (FC/APC, fiber for comb-light input included) 2. cw laser: fiber-coupled (FC/APC)	1. Frequency Comb: fiber-coupled (FC/APC, fiber for comb-light input included) 2. cw laser: fiber-coupled (FC/APC)	Frequency comb + cw laser: fiber-coupled (fiber coupler included)
Outputs	1. Frequency comb + cw laser: fiber-coupled (FC/APC, fiber for beat-light output included) 2. cw laser: free space (fiber coupling optional)	1. Frequency comb + cw laser: fiber-coupled (FC/APC, fiber for beat-light output included) 2. cw laser: fiber-coupled (FC/APC)	RF signal, amplified for use with mFALC
Wavelength	420 nm - 2000 nm	780, 850, 935, 980, 1030, 1064, 1160, 1310, 1390, 1550 nm (others on request)	420 nm - 2000 nm
Split ratio	Adjustable	Fixed: 90:10, 70:30, 50:50 (in %, others on request)	N/A
Spectral operating range	approx. 50 nm (depends on center wavelength)	approx. 100 nm (depends on center wavelength and split ratio)	approx. 50 nm (depends on center wavelength)
Filter element	N/A	N/A	10 GHz bandwidth grating (other bandwidths on request) Optical resolution > 50.000 Tuning via manual adjustment of µm-screw incl. scale reading Tuning resolution < 1 GHz (typ.)
Dimensions (HxWxD)	49 x 100 x 100 mm³	23 x 90 x 200 mm³	64 x 60 x 120 mm³

Options
- Modular DFC Extensions: Various extension modules are available that convert the offset-free fundamental output of the DFC CORE + from 1560 nm to any desired wavelength between 420 nm and 2000 nm
Applications
- Optical Clocks
- Microwave Generation
- Laser Reference
- High-resolution Spectroscopy
- Dual-comb Spectroscopy
- Direct Frequency Comb Spectroscopy
- Interferometry
- Transportable AMO Systems
- Quantum Computing
- CEP-stable Seeders
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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