Exalos Ag | Date: 2013-01-09
An external cavity semiconductor laser light source comprises includes a semiconductor gain device operable to provide light amplification; a wavelength selection element including a diffraction grating; and light re-directors. The gain device, light re-directors and grating are arranged so that an optical resonator is established for light portions emitted by the gain device and diffracted by the diffraction grating. The resonator is an external cavity laser resonator. The light source is capable of varying an angle of incidence of radiation circulating in the resonator onto wavelength selection element to select a resonator radiation wavelength dependent on the angle of incidence.
Exalos Ag | Date: 2013-12-06
An optical module includes a light source. The light source can be a swept wavelength light source, and optical module includes a wavemeter. The wavemeter includes a wavemeter tap capable of directing a wavemeter portion of light produced by the light source away from a main beam, a wavelength selective filter arranged to receive the wavemeter portion, a first wavemeter detector arranged to measure a transmitted radiation intensity of radiation transmitted through the filter, and a second wavemeter detector arranged to measure a non-transmitted radiation intensity of radiation not transmitted through but reflected by the filter. In addition, an optical coherence tomography apparatus includes the optical module.
Exalos Ag | Date: 2010-01-22
A swept wavelength light source is provided, the light source includes a semiconductor gain device operable to provide amplification, an optical retarding device, the retarding device having a block of material, a beam path with a well-defined beam path length being defined for light within the block of material produced by the gain device, a wavelength selector, and the gain device, the retarding device and wavelength selector being mutually arranged on the base so that a resonator is established for light portions emitted by the gain device and selected by wavelength selector; this does not exclude the presence of further elements contributing to the resonator, such as additional mirrors (including resonator end mirrors), lenses, polarization selective elements, other passive optical components, etc.; wherein the beam path in the retarding device is a part of a beam path of the resonator.
Matuschek N.,EXALOS AG |
Duelk M.,EXALOS AG
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2013
The availability of analytical models and numerical simulation tools is inevitable for the development and optimization of broadband high-power superluminescent light-emitting diodes (SLEDs) and its applications. In this paper, various theoretical aspects of SLEDs are discussed, which are important for the successful design of new devices with superior performance. We study the suppression of residual facet reflections as well as the importance of a careful vertical waveguide design. Furthermore, a simple analytical model for the L-I characteristics of SLEDs is developed that is based on a power law with an exponent that is dependent on the chip length. The theoretical model is verified by a comparison with experimental results of a broadband SLED operating in the wavelength region around 1300 nm. It is shown that the model can be also used to extract important simulation parameters from measured L-I characteristics. Finally, results are presented for an improved high-performance SLED structure in the same wavelength region with output powers of more than 50 mW and a 10-dB spectral bandwidth beyond 100 nm. © 1995-2012 IEEE. Source
Unterhuber A.,Medical University of Vienna |
Povazay B.,Medical University of Vienna |
Povazay B.,Bern University of Applied Sciences |
Muller A.,Technical University of Denmark |
And 8 more authors.
Optics Letters | Year: 2013
We demonstrate an optical coherence tomography device that simultaneously combines different novel ultrabroad bandwidth light sources centered in the 800 and 1060 nm regions, operating at 66 kHz depth scan rate, and a confocal laser scanning ophthalmoscope-based eye tracker to permit motion-artifact-free, ultrahigh resolution and high contrast retinal and choroidal imaging. The two wavelengths of the device provide the complementary information needed for diagnosis of subtle retinal changes, while also increasing visibility of deeper-lying layers to image pathologies that include opaque media in the anterior eye segment or eyes with increased choroidal thickness. © 2013 Optical Society of America. Source