DFB – Distributed Feedback Diodes
- Turnkey single-frequency operation (built-in grating)
- Wavelengths from 640 .. 2880 nm available
- Frequency tuning via temperature and current
- Mode-hop-free scans up to 1400 GHz
- Diodes sold separately and in DL DFB systems
Distributed feedback (DFB) laser diodes feature a grating structure within the semiconductor and thus operate in both longitudinal and transverse single mode. Tuning is achieved by modulating either the laser current or the chip temperature. Mode-hop free tuning is maintained over several hundred GHz. Applications include alkaline spectroscopy, laser cooling, gas detection and the generation of tunable cw terahertz radiation.
Available stocklists: Overview laser diode stock lists | DFB stock list
Technical Information
Technical Information
A variety of wavelengths is usually available from stock. In addition, TOPTICA can provide DFB diodes at customized wavelengths, even in low quantities – please inquire.
| Center wavelengths | 640 .. 685 nm1, 760 .. 2880 nm |
| Typical output power | 2 .. 150 mW |
| Typical coarse tuning | 2 .. 6 nm |
Thermal tuning Typical range Typical Speed Typical rate | > 1000 GHz 50 GHz/s -25 GHz/K (@800 nm), -10 GHz/K (@ 1500 nm) |
Electric tuning Typical range Typical speed Typical rate | ~ 50 GHz 10 kHz² 1 .. 10 GHz / mA |
| Typical linewidth (5 µs integration time) | 500 kHz – 4 MHz |
| Typical output beam characteristics | 3 mm x 1 mm |
| Typical output beam polarization | Linear > 100:1 |
| Thermal stabilization | ColdPack, TO-3 or butterfly package |
1Spectral coverage with gaps
2With DCC 110. Higher bandwidth feasible with DL-MOD
Schematics of DFB and DBR laser diodes.
Patented ColdPack for thermal control of DFB diodes.
Emission spectrum of a DFB diode at 1545 nm. Incoherent background radiation is suppressed by > 50 dB.
Thermal frequency tuning of an 895 nm DFB diode.
Options & Related Products
Options & Related Products
- TO-9 mm package
- TO-3 package with built-in TEC and thermistor
- Butterfly package with built-in optical isolator and fiber pigtail
- Note: Some packages may only be available for certain wavelengths, please inquire.
Related Products:
- DL DFB: Complete laser solution with built-in DFB diode
- dfBeam: OEM laser module for Raman spectroscopy and interferometry
- ColdPack: TO-3 laser diode adapter with TECs and thermistor
- Fabry-Perot laser diodes: High power at low cost
- AR laser diodes: Anti reflection coating for best performance
- Tapered amplifiers: Semiconductor optical amplifiers
- Standard Laser Package for tunable cw terahertz generation
- Wavelength meters for precise wavelength measurements
Technical Drawings
Applications
Applications
Applications of DFB diodes include:
- Spectroscopy
- Laser cooling
- Gas sensing
- Generation of tunable cw terahertz radiation
Download
Download
Kraft-et-al-Laser-PhysLett-2004.pdf
