Tunable Laser with Distributed Bragg Reflector (DBR Laser)
Scheme
A tunable DBR lasers consist of several sections:
- the gain section where laser radiation is generated
- the phase section, which enables avoidance of mode hops during tuning and modulation of output power
- the DBR section with an integrated grating which acts as a longitudinal mode filter
- the absorber section synchronizes the longitudinal laser modes and thus enables pulse generation by mode locking
- the cavity section is necessary to reach the required length of e.g. 10 mm for a repetition frequency of 4 GHz
- Principle of a DBR Laser
Applications
- Free space communication
- Display technique
- Spectroscopy
- Nonlinear frequency conversion
- Metrology for high precision measurements of lengths
- Time resolved fluorescent spectroscopy
Wavelength
- 920 nm
- 1060 nm
- 1083 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 DBR structure with MOVPE in a second epitaxial step
- Ridge wave guide laser technology
Mounting
- AlN submounts
- 9 mm SOT package
- TO3 package
- C-mount
- RF-adapted holder for active mode locking
Typical data
- Output power ≤ 300 mW
- Spectral line width < 5 MHz at direct current excitation
- Continuous tuning range: 50 GHz
- Pulse generation with repetition rates up to the GHz range using q-switching
- Pulse generation with repetition rates of about 4 GHz using mode locking [Poster, pdf]
- Pulse length in the range between 2 ps and 100 µs