Dr. Alex Gourevitch Profile

Dr. Alex Gourevitch

at Apple Inc

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 12 February 2010 Paper

Novel sensor for color control in solid state lighting applications

Alex Gourevitch, Thomas Thurston, Rajiv Singh, Bartosz Banachowicz, Vladimir Korobov, Cliff Drowley

Proceedings Volume 7617, 761711 (2010) https://doi.org/10.1117/12.842694

KEYWORDS: Metals, Sensors, Optical filters, Light emitting diodes, Solid state lighting, Prototyping, Photodiodes, Temperature metrology, Optical sensors, RGB color model

Read Abstract +

Proceedings Article | 24 February 2009 Paper

High-power semiconductor lasers for applications requiring GHz linewidth source

Ivan Divliansky, Vadim Smirnov, George Venus, Alex Gourevitch, Leonid Glebov

Proceedings Volume 7198, 71981N (2009) https://doi.org/10.1117/12.810058

KEYWORDS: Semiconductor lasers, High power lasers, Fiber Bragg gratings, Rubidium, Laser systems engineering, Resonators, Absorption, Laser development, Solid state lasers, Optical pumping

Read Abstract +

Proceedings Article | 14 April 2008 Paper

High power volume Bragg laser bar with 10 GHz spectral bandwidth

G. Venus, A. Gourevitch, V. Smirnov, L. Glebov

Proceedings Volume 6952, 69520D (2008) https://doi.org/10.1117/12.783725

KEYWORDS: Semiconductor lasers, Rubidium, Absorption, Continuous wave operation, Mirrors, High power lasers, Potassium, Diodes, Cesium, Laser applications

Read Abstract +

Proceedings Article | 13 September 2005 Paper

1.5 and 2.3 µm diode laser arrays for optical pumping

A. Gourevitch, G. Belenky, L. Shterengas, D. Donetsky, D. Westerfeld, B. Laikhtman, R. Martinelli, G. Kim

Proceedings Volume 5887, 588711 (2005) https://doi.org/10.1117/12.620001

KEYWORDS: Temperature metrology, Semiconductor lasers, Laser development, Pulsed laser operation, High power lasers, Continuous wave operation, Resistance, Erbium, Erbium lasers, Optical pumping

Read Abstract +

High wall-plug efficiency and a wide range of available wavelengths make laser diode arrays preferable for many high-power applications, including optical pumping of solid state lasers. Recently, we designed and fabricated InGaAsP/InP arrays operating at 1.5-μm and In(Al)GaAsSb/GaSb arrays operating at 2.3-μm. We have demonstrated a high continuous-wave (CW) output power of 25 W from a one dimensional laser array and a quasi-CW (q-CW) output power of 110 W from a two dimensional laser array both operating near 1.5-μm. We have obtained a CW output power of 10 W from the 2.3-μm laser array. The 1.5-μm arrays are suitable for resonant pumping of erbium doped solid-state lasers, which require high power optical sources emitting in the narrow erbium absorption bands. Long current-injection pulses produce a considerable temperature increase within the diode laser structure which induces a red-shift of the output wavelength. This thermal drift of the laser array emission spectrum can lead to misalignment with the erbium absorption bands, which decreases pumping efficiency. We have developed an experimental technique to measure the time dependence of the laser emission spectrum during a single current pulse. From the red-shift of the laser emission, we determine the temperature of the laser active region as a function of time. The spacing between the individual laser emitters has an effect on the array heating. In steady state operation, this spacing is a contributing factor in the non-uniformity of the thermal field within the bar, and thus to the overall thermal resistance of the laser bar. Under pulse operation, the transient heating process can be divided into three time periods; each with its own heat transport condition. It was shown that in the initial period of time the heat propagates within the laser bar structure and the laser bar design (fill factor) strongly affects the active region temperature rise. In the later periods the temperature kinetics is insensitive to the fill factor. This analysis has been verified in experimental studies using the 1.5-μm laser arrays.

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years