$dfBeam – Diffraction limited single frequency CW laser$

dfBeam – DFB Diode Laser System

Narrow linewidth < 10 MHz
Long coherence length > 2.5 m
> 35 dB ASE suppression
Fiber coupling available

The dfBeam unites the advantages of our industrial diode laser setup and the unique properties of the latest DFB diode technology. Extremely narrow linewidth, high beam quality, low power consumption, and highest robustness against vibration or mechanical shocks – simply the best for OEM integration. This results in a hands-off laser system for applications such as high resolution Raman microscopy, interferometry or gas sensing.

Technical Information

Available systems:

Wavelength	760 nm	763 nm	773 nm	780 nm	785 nm
Free-beam power	35 mW	40 mW	60 mW	65 mW	80 mW
Other wavelengths from 660 nm -2800 nm on request

Main Specifications (dfBeam-785-S):

Wavelength	785 nm
Spectral linewidth (typ.)	< 10 MHz
Coherence length (typ.)	> 2.5 m
ASE suppression (typ.)	> 35 dB
Wavelength stability (typ.)	0.5 pm (≙ 0.01 cm -1) RMS (3h)
Power (free-beam)	Up to 80 mW
Spatial node	TEM₀₀, M² < 1.2
Beam diameter (typical @ 1/e²)	1.3 mm
Beam shape, ellipticity	Circular, < 10%
Divergence (typical)	< 1 mrad
Power stability (drift over 48 h @ ∆ T ± 1°C)	< 0.5 %
Pointing stability	< 10 µrad/K
Polarization	> 100: 1, linear
DC input requirements	12 V / 2 A
Operating ambient temperature range	15..40 °C
Dimensions (L x W x H)	156 x 56 x 66 mm³
Specifications are subject to change without further notice

For complete spec table please refer to the dfBeam brochure

dfbeam– typical emission spectrum

dfbeam– typical emission spectrum showing more than 35 dB ASE suppression.

Options & Related Products

Options:

Isolator option
Isolator unit with mount (fixed to dfBeam), isolation > 34 dB, transmission > 86 %. This option is strongly recommended, as single-frequency laser are very sensitive even to very low optical feedback
Fiber coupling - FiberDock
TOPTICA's FiberDock turns the dfBeam into a rugged ﬁber-coupled diode laser system. Both single-mode and polarization-maintaining fibers can be connected to the FiberDock. Better than 60 % coupling efficiency is guaranteed, but efficiencies of 75 % are typical due to the high beam quality of the iBeam.
Please note: Fiber coupling is only available in combination with the isolator option!
Fiber output collimator – FiberOut
Some applications demand a fiber-coupled laser and beam collimation at the end of a fiber. To provide a comprehensive solution, the FiberOut turns the divergent beam at the fiber end into a collimated beam again (0.5 mm - 4 mm @ 1/e² CA: 4.8 mm). FC/PC and FC/APC connectors are standard, others can be accommodated.
Wide-range AC/DC transformer
Provides the necessary 12 V DC, if no

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