DFB pro
Distributed-feedback laser
Single-frequency laser with distributed-feedback diode
Available wavelengths: 633 nm, 760 nm .. 3500 nm
Mode-hop free tuning range: Up to 1400 GHz
Reliable operation even in harsh environments
3 laser heads – wide range of options
Distributed feedback (DFB) lasers unite wide tunability and high output power. The frequency-selective element – a Bragg grating – is integrated into the active section of the semiconductor and ensures continuous single-frequency operation. Due to the absence of alignment-sensitive components, DFB lasers exhibit an exceptional stability and reliability. The lasers work under the most adverse environmental conditions – even in the Arctic or in airborne experiments.
Three laser heads, designed specifically for DFB lasers, accommodate different diode packages: the compact DFB pro and its “big brother” DFB pro L integrate 9 mm or TO3-type diodes. The DFB pro BFY offers a dedicated laser head for butterfly-type diodes.
Owing to their wide continuous tuning range, DFB lasers lend themselves particularly to applications in atomic and molecular physics, gas sensing, phase-shifting interferometry, and continuous-wave terahertz generation.
Applications
Alkaline spectroscopy
Molecular physics
Gas sensing
Interferometry and holography
Optical communication
Magnetic-field measurement
Continuous-wave terahertz generation
Options
Fiber Coupling (FiberDock)
TOPTICA’s patented fiber coupler provides highest single-mode fiber-coupling efficiencies, easy alignment and at the same time highest stability. TOPTICA additionally offers a wide range of single-mode and polarization-maintaining fibers, including fiber-optic beam splitters. Optical isolation is mandatory for fiber-coupled diode laser systems.
Optical Isolation
Isolators are used to protect the laser diode against back reflections. This not only prevents damage to the diode but also ensures untroubled tuning and single-frequency operation. Fiber-coupling with angle-polished fibers (both ends) requires at least a single-stage isolator (> 30 dB). Double-stage isolators are needed if reflections from the experiment into the laser are expected. Fiber-coupling with non-angle-polished fibers also requires a double-stage isolator (> 60 dB).
Beam Shaping
To shape elliptical laser beams into round profiles, either an anamorphic prism pair (APP) or cylindrical lenses are used. The compressed circular beam is small enough for using inexpensive small-aperture isolators, and the fiber-coupling efficiency is enhanced by approximately 10 %. The compression ratio is set at the factory.
Bias-T
The DL pro (HP) has two modulation inputs that allow current modulation frequencies of up to 150 MHz. A Bias-T allows even higher current modulation frequencies of up to several GHz, depending on the diode. It is also suited for seed lasers of TA or NLO systems but not for DL pro HP lasers.
Electronics Modules
A broad variety of electronic locking modules is available for frequency stabilization.
Specification
DFB pro DFB pro L DFB pro BFY Center wavelengths
633 nm, 760 nm - 3500 nm
1064 nm .. 2000 nm *
Output power
2 .. 150 mW
10 .. 100 mW (fiber output)
Tuning range
2 .. 6 nm
2 .. 5 nm, mode-hop free
Thermal tuning
Typical range
> 1000 GHz
> 600 GHz
Typical speed
50 GHz / sec
25 GHz / sec
Typical rate
-25 GHz / K
-10 .. -15 GHz / K
Electric tuning
Typical range
50 GHz
> 25 GHz
Typical speed
Up to MHz frequencies
Up to MHz frequencies
Typical rate
1 .. 10 GHz / mA (@ 1 Hz speed)
0.3 .. 1.0 GHz / mA (@ 1 Hz speed)
Typical linewidth (time scale 5 µs)
1 .. 4 MHz
0.5 .. 5 MHz
Output beam characteristics
Collimated, 3 mm x 1 mm (circular with Beam shaping / pro)
Circular, divergent, Fiber NA typ. 0.12
Output beam polarization
Linear, > 100:1
Linear, typ. 100:1
Fast modulation
(AC and DC coupled)Included
Included
Included
Beam shaping / pro
Optional
Optional
--
Optical isolators
Optional, 30 dB **
Optional, 30 dB or 60 dB
Included ***
Fiber coupling
SmartDock, optional
FiberDock, optional
Fiber pigtail
Fiber coupling efficiency: min. (typ.)
50% (60%)
50% (60%)
N.A.
Fiber coupling efficiency with
beam shaping / pro55% (65%)
55% (65%)
N.A.
Dimensions laser head (H x W x D)
45 x 90 x 165 mm****
90 x 90 x 240 mm****
55 x 130 x 165 mm
Weight laser head
2 kg
3 kg
1 kg
Typical wavelengths
633 nm
780 / 795 nm
1178 nm (butterfly)
780 / 795 nm
852 / 895 nm
1.5 µm
852 / 895 nm
1000-1100 nm
1.65 µm
> 2 µm (free-beam, w/o isolator)
1178 nm
2 µm (butterfly)
Dimensions control unit (H x W x D)
154 mm x 450 mm x 348 mm
Weight control unit
9 kg
Operating voltage
100 .. 240 V~, 50/60 Hz (wide-range input)
Power consumption
Typ. < 50 W, max. 250 W
PC Interface
Ethernet
Environmental temperature
15 - 30 °C (operating), 0 - 40 °C (storage and transport)
Environmental humidity
Non condensing
* Spectral coverage with gaps
** Requires Beam shaping / pro
*** Additional fiber isolators can be added upon request
**** Without fiber coupler
商品属性 [波长] 633 nm, 760 nm - 3500 nm [功率] 2 .. 150 mW