DL DFB – Distributed Feedback Lasers
- Single-frequency laser with distributed feedback diode
- Any wavelength between 760 nm .. 3500 nm available
- Largest mode-hop free tuning range: Up to 1400 GHz
- Reliable operation even in harsh environments
- Options: High-frequency modulation, fiber output
Distributed feedback (DFB) lasers offer wide frequency tuning and high output power in a compact, rugged setup. The frequency selective element – a Bragg grating – is integrated into the active section of the semiconductor and ensures single-frequency operation without any bulk optics. A wide variety of DFB diodes is available from stock; custom wavelengths can be provided even in low quantities. Available DFB diodes.
Technical Information
Technical Information
DL DFB wavelength coverage: 640 .. 3500 nm.
Specifications:
| Center wavelengths | 640 .. 685 nm* 760 .. 3500 nm* |
|---|---|
| Typical power range | 2 .. 150 mW |
| Typical coarse tuning range | 2 .. 6 nm |
| Thermal tuning: Typical range Typical speed Typical rate | > 1000 GHz 50 GHz / sec - 25 GHz/K |
| Electric tuning: Typical range Modulation bandwidth Typical rate | 50 GHz 10 kHz** 1 .. 10 GHz/mA |
| Typical linewidth (5 µs integration time) | 1 .. 4 MHz |
| Typical output beam characteristics | 3 mm x 1 mm |
| Typical output beam polarization | Linear > 100:1 |
| Fiber coupling efficiency***: min. (typ.) | 55 (65) % |
| Fiber coupling efficiency with APP***: min. (typ.) | 65 (75) % |
| Typical frequency change with ambient temperature | < 100 MHz/K |
| Thermal stabilization | ColdPack or TO-3 package |
| Environmental temperature (operating) | 15 - 30 °C |
| Environmental temperature (transport) | 0 - 40 °C |
| Humidity | Non condensing |
| Operating voltage | 100 .. 120 V / 220 .. 240 V AC 50 .. 60 Hz (auto detect) |
| Power consumption | Typ. < 100 W, max. 300 W |
*Spectral coverage with gaps
**With SYS DC 110. Higher bandwidth feasible with HF modulation PCB
**With TOPTICA's FiberDockSpecifications are subject to change without further notice TOPTICA Photonics AG, www.toptica.com
Thermal frequency tuning of an 895 nm DL DFB distributed feedback diode laser.
Current tuning of a DL DFB diode laser.
Patented ColdPack for thermal control of DFB diodes.
Options & Related Products
Options & Related Products
| Option | Description |
|---|---|
| DL-Mod | The PCB includes a FET and a Bias-T. The FET is DC coupled with an electrical bandwidth (-3 dB) of 20 MHz. The Bias-T is AC-coupled with an electrical bandwidth of > 300 MHz. The optical modulation bandwidths are generally lower and depend on the properties of the diode. |
Optical Isolation
| Isolators are used to protect the laser diode from back reflections. This not only prevents damage to the diode but also ensures untroubled single-mode operation and tuning. Fiber coupling with angle polished fibers (both ends) requires at least a single stage isolator. |
Optical Isolation
| 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. |
APP C
| The compact prism pair is used for beam compression only. 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. The variable APP J is available for beam compression and expansion. |
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. |
| Electronics Modules | A large range of control, stabilization and frequency locking modules are available. |
Standard Configurations:
| Configuration | Consists of | Available wavelengths |
|---|---|---|
Configuration I
|
| 640 .. 685 nm, 760 .. 2880 nm |
Configuration II
|
+ Modulation PCB DL-Mod/DFB (optional) | 640 .. 685, 760 .. 935, 1260 .. 1395, 1490 .. 1610 nm |
Configuration III
|
+ Modulation PCB DL-Mod/DFB (optional) | 640 .. 685, 760 .. 1180, 1260 .. 1395, 1490 .. 1600 nm |
Configuration IV
|
+ Modulation PCB DL Mod/DFB (optional) | 650 .. 685, 760 .. 900, 1060 .. 1090, 1285 .. 1335, 1515 .. 1585 nm |
Related Products:
- DL DFB BFY: Distributed feedback laser butterfly-packaged diodes
- ColdPack: TO-3 adapter with TECs and thermistor
- dfBeam: OEM laser module for Raman spectroscopy and interferometry
- DL 100: Economic Littrow type ECDL in modified Hänsch design
- DL 100 / pro design: Tunable, ultra-stable ECDL
- DL pro: pro series ECDL with exceptional AR laser diodes
- BoosTA: Stand-alone semiconductor amplifier
- Lasers for cw terahertz generation
Technical Drawings
Applications
Applications
The high inherent long-term stability of frequency and output power, the insensitivity to acoustic noise, and the wide continuous tuning range, makes the DL DFB laser an ideal source for
- Alkaline spectroscopy (K, Rb, Cs),
- Gas sensing (e.g. O2, H2O, methane),
- Holography,
- Phase-shifting interferometry,
- Generation of tunable cw terahertz radiation.
Absorption spectrum of water vapor, recorded with a DL DFB laser at 935 nm.
Application Notes:
Download
Download
Kraft-et-al-Laser-PhysLett-2004.pdf
