2. Research
  3. Photonics
  4. Chips - Laser & LEDs
  5. Tunable & Dual-Wavelength Lasers

Tunable & Dual-Wavelength Diode Lasers

Tunable lasers emitting in the near infrared are needed for a wide variety of applications. These include absorption spectroscopy, biomedical imaging, and nonlinear frequency conversion. The basis of these laser sources are integrated wavelength-selective grating structures, which enable narrow-band and spectrally tunable light emission.


Our research activities in this area aim at an extended mode hopping free tunability, a higher output powers as well as an improved beam properties of these lasers.

 

Schematic illustration of a dual-wavelength diode laser
Schematic illustration of a dual-wavelength diode laser
Sampled grating MOPA laser source next to a 1 cent coin
Sampled grating MOPA laser source

Sampled grating laser

are based on specially shaped and overgrown grating structures. The controlled detuning of the resulting reflection spectra allows a wide mode hopping-free tunability of the emitted laser radiation.

  • up to 70 mW output power
  • tunable up to 20 nm

Dual-wavelength diode laser

enable the simultaneous or sequential emission of light of two mutually detuned wavelengths out of the same waveguide (Y-laser). This is achieved by combining two lasers via waveguide coupler.

  • realizable as oscillator-amplifier combination
  • source of optical beating signals in the THz range
  • output power up to 300 mW
  • 2 - 4 nm tunability per laser
  • nearly gaussian beam profile

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