摘要:

We describe the fabrication and operation of vertical cavity surface emitting layers by pulsed optical pumping. The structure consists of a vertical cavity resonator with SiO2/SiN distributed Bragg reflectors and a CdZnSe/ZnSe strained‐layer superlattice active region. The emission spectra rapidly narrow to full width at half‐maximum of 7 A˚ and the emission intensity increases by over two orders of magnitude, indicating stimulated emission. Lasing is observed at thresholds of ≊44 kW/cm2at temperatures up to 30 K with lasing wavelength near 488 nm. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114232

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

A theory for quantitative analysis of microdisk laser emission spectra is presented. Conformal mapping is used to determine the radial and azimuthal eigenvalues and eigenvectors corresponding to leaky optical modes in the disk. The results are compared with experimental data obtained from a 0.8 &mgr;m radius InGaAs/InGaAsP quantum well microdisk laser. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114233

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

The transverse electric mode characteristics in a cylinder waveguide with a periodic dielectric cladding have been analytically studied. The periodic dielectric cladding induces band structures in the characteristics and enhances the confinement of the electromagnetic energy in the core compared to a cylinder waveguide with a uniform cladding. Potential applications based on the characteristics are discussed in optical communications and photonics. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114234

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

In the vicinity of the phase‐matching angle of second‐order nonlinear optical crystals, the fundamental light wave experiences an intensity‐dependent phase shift which is connected with the effective attenuation due to second‐harmonic generation. It is demonstrated that in the limit of weak pump depletion, the Kramers–Kronig relations can be used to derive a simple analytical expression for the phase shift as a function of the phase‐mismatch angle. For certain mismatch angles, a large phase shift occurs without any attenuation. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114235

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Saturable‐absorber Q switching of an erbium‐doped Y3Al5O12(YAG) laser at 1.64 &mgr;m using U2+:SrF2and U2+:CaF2was demonstrated. The Er:YAG was longitudinally pumped using a free‐running 1.534 &mgr;m Er:glass laser. Q switched 1.64 &mgr;m pulses of 1.7 mJ and 25 ns pulse widths were obtained. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114236

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Second‐harmonic generation in a LiTaO3periodically poled by electric field is presented. The side growth of the domain‐inverted region during the poling was found to be suppressed using selective proton exchange. Utilizing this technique, a first‐order periodic domain inversion having uniform periodicity was realized over interaction length of 10 mm in a 300‐&mgr;m thick LiTaO3substrate. A 3.8 mW of harmonic blue light was generated for a conversion efficiency of 1.27% in a single pass through the periodically domain‐inverted structure. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114237

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Novel self‐aligned hybrid integration of semiconductor lasers with three‐dimensional micro‐optical components has been demonstrated. The self‐alignment structures are fabricated integrally with other three‐dimensional micro‐optical elements such as micro‐Fresnel lenses, mirrors, and gratings on a single Si chip by surface micromachining technology. The Si substrate serves as a free‐space micro‐optical bench for active and passive optoelectronic components. A divergent beam emitted from an edge‐emitting semiconductor laser has been successfully collimated by the integrated micro‐Fresnel lens. The integration scheme offers a new approach for optoelectronic packaging and a new technology platform for integrating complete free‐space micro‐optical system on a single chip. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114238

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

We have fabricated edge‐emitting GaAs/AlGaAs quantum well lasers in which the outer cladding layers have been replaced by multilayer Bragg reflectors. The reflectance peak spans the intrinsic spontaneous emission spectrum of the wells and there are no allowed vertical cavity modes within this spectrum. Compared with an equivalent alloy structure the threshold current of these lasers is reduced by 25%. This is due to a reduction in the spontaneous recombination current rather than an increase in internal efficiency. Studies of spontaneous emission normal to the sample surface show that the emission intensity is significantly reduced. We suggest that the threshold current is reduced by reduction in the spontaneous recombination rate due to a combination of inhibition of the emission and photon recycling. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114239

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Persistent spectra hole burning is observed at room temperature in the excitation spectrum for the7F0→5D0transition of the Sm2+ions that are doped in aluminosilicate glass. Glass having the composition of Sm2+‐doped Al2O3⋅9SiO2has been prepared by the sol‐gel processing of metal alkoxides and the reaction with H2gas at 800 °C. Sol‐gel derived glass enables Sm to be doped in the Sm2+state of which the 4f6(7F0)→4f55dband does not overlap with the5D0→7F0line. The hole width and depth, which are burned by the DCM dye laser, are ∼15 cm−1and ∼10% of the total intensity, respectively, at 20 °C. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114240

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

The waveguiding characteristics of a novel power switch with one input andnoutputs (1×n) using oblique incidence to a nonlinear slab is proposed. With a proper incident optical power, the emitted soliton in the nonlinear slab can be efficiently directed to any waveguide in a array ofnwaveguides. For digital signal switching application, the numberncan be increased simply by increasing the slab thickness. Moreover, it is found that the soliton offsets calculated by Snell’s law with an index obtained by averaging over the index distribution are in good agreement with those calculated by the beam propagation method. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.114241

出版商:AIP    

年代:1995

数据来源: AIP