摘要:

A diffraction‐coupled laser array has been actively mode locked in an external cavity to yield Gaussian pulses as short a 61‐ps full width at half‐maximum with a peak power of 1.1 W and an average power of 0.07 W. The array consists of 10 lasers, each 3 &mgr;m wide with 9‐&mgr;m center to center spacing. It emits with a stable double‐lobed far‐field pattern characteristic of the out‐of‐phase coupling between neighboring lasers. These arrays may be useful where high peak as well as high average optical powers are required.

ISSN:0003-6951    

DOI:10.1063/1.94774

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Optical bistability is observed using a single‐mode diode laser in a GaAs‐AlGaAs multiple‐quantum‐well etalon with as low as six mW power at 830 nm.

ISSN:0003-6951    

DOI:10.1063/1.94775

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A novel CO2laser using electrochemical transformation of organic compounds (ECTO) has been developed. cw CO2laser action was obtained by applying an electric discharge to the air, which contained organic vapors such as alcohols and benzene derivatives. The CO2molecules produced by the chemical reaction in the laser tube and the N2molecules contained in the air were excited by the discharge. The ECTO CO2laser produced an output power of 7 W, which was comparable to the power obtained from a conventional CO2laser gas mixture.

ISSN:0003-6951    

DOI:10.1063/1.94776

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Observation of optical bistability at the band gap in InAs is reported. Clear hysteresis was seen in the reflected signal from a Fabry–Perot etalon consisting of polishedn‐type InAs with silver deposited on the back surface. By using the 3.096‐&mgr;m line of an HF laser, which matches the band gap at 77 K, bistable switching was achieved with power levels as low as 3 mW (peak intensity 75 W/cm2).

ISSN:0003-6951    

DOI:10.1063/1.94777

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Phase locking has been achieved between two adjacent waveguide CO2lasers separated by a thin plate of ZnSe. Radiation leakage from one waveguide to the other through the ZnSe causes the phase locking, and stationary interference fringes demonstrate the relative phase stability. Both waveguide lasers are excited by dc discharges and operate on one of severalPorRtransitions in the 10.4‐&mgr;m band. Phase locking occurs whenever both waveguides are on the same transition. Annbymarray of such phase‐locked lasers has the potential of nearly an (n×m)2increase in the peak of the lasers’ far‐field irradiance distribution.

ISSN:0003-6951    

DOI:10.1063/1.94778

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The first cw monolithic two‐section lasers were fabricated using reactive‐ion‐etched grooves in buried‐crescent wafers. Tunable single‐mode selection with spurious mode levels down ∼20 dB was demonstrated under modulation.

ISSN:0003-6951    

DOI:10.1063/1.94771

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

We have measured the temperature dependence of the threshold current of an InGaAsP injection laser pumped by 130‐ps electrical pulses. By comparing the data with the empirical ruleIth=I0 exp(T/T0), we have observed aT0of 148 K. The results indicate that we can partially separate carrier depletion processes, e.g., spontaneous radiative, Auger, or other nonradiative recombination, and carrier leakage from the fast stimulated emission process, hence, eliminate their effect on the temperature stability of the threshold current.

ISSN:0003-6951    

DOI:10.1063/1.94772

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Trapezoidal gratings, both with and without thin dielectric overcoatings, have been used to couple up to 70% of a 119‐&mgr;m laser beam into surface plasmons on a metal surface. The results indicate significant grating induced shifts in the dispersion relations.

ISSN:0003-6951    

DOI:10.1063/1.94773

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Bistability in the spectral output of a two‐section cleaved‐coupled‐cavity (C3) semiconductor laser is observed. A wide (10 mA) and temperature insensitive hysteresis loop is obtained at laser currents up to at least 3×Ithand the laser can be switched with subnanosecond electrical pulses between its two spectraly pure states. The switching is characterized by a power‐delay product of 4×10−12J and a switching time of less than 1 ns.

ISSN:0003-6951    

DOI:10.1063/1.94779

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

We have demonstrated operation of a cleaved‐coupled‐cavity (C3) diode laser of PbS1−xSexin the 4–5‐&mgr;m infrared spectral region. It was possible to obtain improved laser mode control by adjusting the modulator section current. Reproducible single mode operation with 1.5 mW of cw output power at 175 mA of laser current (power efficiency of 3.5%) was observed. A single mode tuning range of 2.16 cm−1was obtained at a lower power value. Laser frequency tuning rates were found to be significantly reduced by use of modulator current tuning as opposed to laser current tuning. The observed results suggest that the C3Pb‐salt laser may provide a much greater degree of mode control than has been possible with single‐cavity lasers.

ISSN:0003-6951    

DOI:10.1063/1.94780

出版商:AIP    

年代:1984

数据来源: AIP