Laser with Internal Grating (DFB Laser)
Scheme
The lateral confinement is achieved using a ridge waveguide. A Bragg grating which spans the whole resonator acts as a longitudinal mode filter.
- Principle of a DFB laser
Applications
- Raman spectroscopy
- Absorption spectroscopy
- Non-linear frequency conversion
- Cooling of atoms with Doppler effect (Bose-Einstein Condensation)
- Application in atomic clocks
- Interferometry
Wavelength
760 nm to 1080 nm
Chip technology
- Multiple step MOVPE epitaxy
- After first epitaxy: Realization of the Bragg grating for frequency stabilization with holographic lithography and etching
- Overgrowth of the realized DFB structure with MOVPE in a second epitaxial step
- Ridge wave guide laser technology
Mounting
- AlN submounts
- Open heat sink (C-mount)
- 9 mm SOT package
- TO3 package
Typical data
- DFB RW laser:
- Output power up to 500 mW independent of the laser wavelength
- Side mode suppression rate better than 50 dB with a spectral line width lower than 10 MHz up to high output power
- Nearly Gaussian shape beam profile in a wide power range with a typical beam divergence of 20° x 10°
- [Poster, pdf]
- DFB BA laser:
- Comparable output power (>3 W) and beam characteristic to conventional broad area lasers.
- Reduced spectral full width half maximum (< 0.5 nm) and better temperature stability of the emission spectrum