Tunable Laser with Distributed Bragg Reflector (DBR Laser)

Scheme

Principle of a 3-section DBR laser
Principle of a 3-section DBR laser
Principle of a DBR-RW laser
Principle of a DBR-RW laser
Bonded section laser
Bonded section laser

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

Applications

  • Free space communication
  • Display technique
  • Spectroscopy
  • Nonlinear frequency conversion
  • Metrology for high precision measurements of lengths
  • Time resolved fluorescent spectroscopy

Wavelength

  • 635 nm
  • 808 nm
  • 920 nm
  • 1060 nm
  • 1083 nm

Chip technology

  • Buried gratings
    • 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
  • Surface gratings
    • Single step MOVPE epitaxy
    • Realization of the Bragg grating on the surface of the wafer with i-line wafer stepper or e-beam lithography and etching
    • 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 ≤ 1 W
  • Spectral line width, intrinsic: < 10 kHz, FWHM: approx. 100 kHz
  • Continuous tuning range: 190 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
  • Pulse length in the range between 2 ps and 100 µs