Rashit F. Nabiev

Visible laser and laser array sources for projection displays

Laser-based projection displays have long attracted interest because of the multiple advantages (expanded color gamut, high resolution, longer lifetime, etc.) expected from lasers as compared to lamps. However, most of these advantages have been largely negated by the significant cost, size, and cooling requirements associated with lasers, and their inability to produce red, green, and blue colors in the same platform. In this paper, we review a new, laser array technology based of frequency-doubled, semiconductor, surface-emitting lasers. The key features of this technology, such as demonstrated multi-Watt output for rear-projection TVs, power levels scalable with the number of emitters, speckle suppression due to multi-emitter array, and a low-cost and compact design are discussed in detail.

Spatial gap solitons in periodic nonlinear structures

Self-focusing effects in periodic leaky-wave coupled (antiguided) and evanescent-wave coupled array structures are analyzed for what is to our knowledge the first time. The results obtained can be explained in terms of spatial gap solitons. For infinite-extent arrays of antiguides it is found that (for interelement-spacing values), below the in-phase-mode resonance, self-focusing occurs with increasing light intensity even when the medium is intrinsically self-defocusing (i.e., negative nonlinearity). If the medium has positive nonlinearity the analysis shows that antiguided arrays possess either self-focusing or self-defocusing properties depending on the parameters of the structure, whereas evanescent-wave in-phase coupled arrays always have self-focusing properties.

High-power 600-nm-range lasers grown by solid-source molecular beam epitaxy

This paper presents the performance characteristics and reliability data of AlGaInP-based VISIBLE laser diodes emitting at the wavelengths from 630 to 670 nm. The lasers are grown by toxic gas free solid source molecular beam epitaxy.

High performance laser diode bars with aluminum-free active regions.

We present operating and lifetest data on 795 and 808 nm bars with aluminum-free active regions. Conductively cooled bars operate reliably at CW power outputs of 40 W, and have high efficiency, low beam divergence, and narrow spectra. Record CW powers of 115 W CW are demonstrated at 795 nm for 30% fill-factor bars mounted on microchannel coolers. We also review QCW performance and lifetime for higher fill-factor bars processed on identical epitaxial material.

Electrically pumped directly modulated 1550-nm tunable VCSELs

In this paper, we will present the recent progress of electrically-pumped directly-modulated tunable 1550 nm VCSEL development at Bandwidth9. The device is fabricated from an all epitaxial VCSEL structure grown on an InP substrate, with a monolithically integrated tuning arm for continuous wavelength tuning. We have demonstrated over 1 mW CW output power and over 20 nm tuning range in C-band and error free transmission performance at 2.5 Gbps over 100 km SMF-28 fiber. The reliability test data of the tunable VCSELs shows a projected failure rate of less than 400 FITS.

High-power highly reliable Al-free active region laser diodes in the 785- to 830-nm region

Use of aluminum-free epitaxial structures for near-infrared laser diodes has been an active research area in the past decade. These edge-emitting laser diodes have demonstrated operational lifetimes exceeding 10,000 hours at high output powers and high efficiencies. Improvements in epitaxial structure, processing, and packaging have enabled these results. In this paper, we will review developments in aluminum-free laser diodes. We describe our recent work with these devices and conclude by discussing reliability issues.

Self-stabilization of fundamental in-phase mode in resonant antiguided laser arrays

The effect of gain spatial hole burning on antiguided arrays is analyzed for the first time. Nonresonant devices, due to the nonuniformity of the in-phase-mode intensity profile, experience self-focusing and multimode operation with increasing drive level similar to the behavior of evanescent-wave-coupled devices. Resonant and near-resonant devices (i.e. resonant-optical-waveguide (ROW) arrays), due to the uniformity of the in-phase mode, display some mild defocusing with increasing drive level, while the nearest high-order mode cannot reach threshold up to drive levels in excess of 10X threshold. These results explain the fundamental single-mode stability of ROW arrays, in excellent agreement with experimental data.

High-power 650-nm laser diodes grown by solid-source molecular beam epitaxy

Summary form only given. Nearly 1 W cw power at 25 C was obtained from a 50-/spl mu/m broad-area InGaP SQW laser emitter operating at 652 nm. The devices were grown by solid source molecular beam epitaxy (SSMBE) and offer the possibility of a compact source suitable for photodynamic therapy.