We review our recent progress on the fabrication of near-infrared photodetectors based on intersubband transitions in AlN/GaN superlattice structures. Such devices were first demonstrated in 2003, and have since then seen a quite substantial development both in terms of detector responsivity and high speed operation. Nowadays, the most impressive results… (More)
A femtosecond fiber laser with an intracavity electro-optic modulator is phase-locked to a high-finesse cavity through two cw transfer lasers. The residual phase noise at the 300 MHz harmonic is -126 dBc/Hz at 1 Hz.
The instantaneous optical frequency of an external-cavity quantum cascade laser (QCL) is characterized by comparison to a near-infrared frequency comb. Fluctuations in the instantaneous optical frequency are analyzed to determine the frequency-noise power spectral density for the external-cavity QCL both during fixed-wavelength and swept-wavelength… (More)
Properly stabilized, frequency combs form high accuracy references across much of the optical spectrum. Here we employ dual frequency combs to harness this accuracy for fast and high resolution measurements of frequency agile CW lasers.
The linearity of actively stabilized laser chirp from approximately 1530 to 1570 nm is measured by use of an optical frequency comb showing residuals of <; 60 kHz after removing low order dispersion related effects.
A coherent dual comb spectrometer spanning over 45 THz in the NIR was constructed from broadened erbium fiber lasers. Gas phase water, methane, and acetylene spectra were measured and characterized toward establishing absolute frequency references.
Dual, coherent frequency combs are used to measure the spectrum of an incoherent, quasi-thermal source through Fourier spectroscopy. The source spectrum is acquired over 1 THz bandwidth with an absolute frequency accuracy set by the combs. Work of the U.S. government, not subject to copyright.
This review covers the physics, epitaxial growth, fabrication, and characterization of optoelectronic devices for use in video players and other consumer electronics as well as in commercial systems. ABSTRACT | We report on the physics, epitaxial growth, fabrication, and characterization of optoelectronic devices based on intersubband transitions in the… (More)
The time-resolved frequency spectrum of a frequency agile CW laser is measured with a 300 μs update rate and 3 kHz resolution/accuracy over a 28 nm wavelength range with a coherent dual comb setup.