Wavelength-stabilized tilted cavity quantum dot laser

Abstract

Wavelength-stabilized operation is realized in broad area quantum dot laser diodes with cleaved facets grown in the tilted cavity laser (TCL) design for the range up to 1.3 µm. For two different designs TCL wavelength is chosen to be either in the range of quantum dot excited state transitions (1.16 µm), or in the range of quantum dot ground state transitions (1.27 µm). The shift of the lasing wavelength is 0.165 nm K −1 in a temperature range between −200 • C and 70 • C. The spectral width of the lasing emission in broad area devices is 0.6 nm and the width (FWHM) of the far field is 4 • and 42 • for lateral and vertical directions, respectively.

MBE-grown ultra-large aperture single-mode vertical-cavity surface-emitting laser with all-epitaxial filter section

“…The width of the contact grid is 10 mm. The processing details are described elsewhere [13,15]. The laser-diode crystals were mounted p-side up on copper heat sinks.…”

“…The device is designed in such a way that the spectral positions of the cavity dip and of the stop-band maximum coincide at only one tilt angle, and therefore the resonant conditions for low-loss operation are realized at one certain wavelength. Recently, wavelength-stabilized operation was demonstrated in broad-area quantum dot lasers [13]. Depending on the particular TCL design, the laser light can come out through the facet or the top surface.…”

Edge and surface-emitting tilted cavity lasers (Invited Paper)

“…A C-doped GaAs 0.3 µm-thick contact layer was grown on top. QDs used in the active region had sizes to provide broad emission spectrum up to 1.3 µm at room temperature [2]. The minimum loss wavelength in the vicinity of room temperature was calculated to be at 1162 nm (290 K) to ensure overlap with the gain spectrum in broad temperature range.…”

“…Telecom applications requesting 40 mW of single mode (SM) power or evolution datacom systems to 40 Gb/s requests much higher single mode power (+6 dB) than available for standard planar technology SM VCSEL design. In the TCL the light propagates at significant tilt angle with respect to the layers of the structure (speaking the language of geometrical optics) forming a zig-zag pathway in the resonator [1,2].…”

“…Edge-emitting Fabry-Pérot (FP) and vertical-cavity surface-emitting (VCSEL) lasers are the traditional types of laser diodes. Tilted cavity laser (TCL)[1,2] combines advantages of both types and can be easily fabricated in any material system…”