Jorg Fricke

Learn More
GaAs-based narrow-stripe broad-area lasers with integrated surface gratings are shown to operate with high power and efficiency, low beam parameter product (BPP), and narrow spectra. These distributed feedback lasers are constructed using a surface-etched, 80th-order grating, leading to spectral width <formula formulatype="inline"><tex(More)
Semiconductor lasers with integrated surface gratings are known to operate with narrow spectra as well as high power and efficiency. In this paper, we present a theoretical description of DFB lasers with 80th-order waveguide gratings, fabricated by etching narrow grooves into the epitaxial layer structure. The passive gratings are simulated by mode(More)
In this letter, we report on monolithic distributed Bragg reflector ridge waveguide diode lasers. The lasers feature highly strained InGaAs quantum wells and fifth order surface gratings for a stabilized emission wavelength ~1120 nm. Output powers up to 1 W and a maximum conversion efficiency of ~34% were achieved in a spatial and spectral single-mode. In a(More)
For a maximum fiber-coupled power, high power broad-area diode lasers must operate with a small lateral far-field divergence at high continuous wave (CW) powers. However, these structures are laterally multi-moded, with a low beam quality and wide emission angles. We present a new approach to suppress higher-order lateral modes based on an anti-guiding(More)
In this letter, we present results on the pulsed operation of a distributed Bragg reflector ridge waveguide diode laser with wavelength close to 1120 nm. Picosecond optical pulses were generated by gain-switching at variable repetition frequencies up to 80 MHz. In single-pulse operation, a pulse width of 92 ps with a pulse peak power of 1.7 W at 10 MHz(More)
THz wave generation from a dual wavelength distributed Bragg reflector (DBR) semiconductor diode laser connected by an Y-shaped waveguide with photoconductive antennas is demonstrated. Two fibre coupled photoconductive antennas were employed to generate and detect the beat frequency of the two lasers by lock in technique. Terahertz frequencies of(More)
  • 1