摘要:

A technique is reported which allows simultaneous two‐wavelength selection in the N2laser‐pumped dye laser. The two wavelengths are continuously tunable anywhere within the optical gain region of the particular dye solution used, and the two output beams are collinear and collimated, have mutually orthogonal polarizations, and in general can be temporally synchronized. Following the description of this device, the extension of this technique to other lasers and a few potential applications will be briefly discussed.

ISSN:0003-6951    

DOI:10.1063/1.1654402

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A high‐repetition‐rate optical pulse generator which employs a Fabry‐Perot electro‐optic modulator as the output coupler of a laser resonator was constructed. Using this generator with a He&sngbnd;Ne 6328‐Å laser tube, 21‐psec optical pulses at a repetition rate of 2.7 × 109pps were experimentally obtained with an average power level of 0.5 mW. In addition, it is demonstrated that the width of the pulses obtained from this generator can be narrowed without regard to the gain‐linewidth limitation. This kind of pulse generator may be particularly useful for obtaining short optical pulses from low‐gain gas lasers, and it is possible to obtain 1010‐pps picosecond pulses from a He&sngbnd;Ne 6328‐Å laser.

ISSN:0003-6951    

DOI:10.1063/1.1654403

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A CO TEA laser, cooled to 77°K by a surrounding liquid‐nitrogen bath, is found to exhibit laser action on approximately 60 transitions over the spectral range 4.960–5.610 &mgr;m. Following a single 0.5‐&mgr;sec excitation pulse, lasing action is observed to continue up to 2 msec with 15 Torr of CO and up to 4 msec with a 14‐Torr CO&sngbnd;N2mixture.

ISSN:0003-6951    

DOI:10.1063/1.1654404

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

In a cw dye laser apparatus we measure first the fluorescence depolarization in the usual manner, and then the ratio of laser threshold pump powers for the laser polarization parallel and perpendicular to the linearly polarized pump source. From these two measurements we can obtain the important triplet‐state parameterKT≡kST&tgr;T&sgr;T/ &sgr;e, as well as the rotational relaxation time for the dye. For Rhodamine 6G in water with Triton X‐100, we findKT=0.35 ± 0.02, while with Ammonyx‐LOKT=0.25 ± 0.02. These additives also slow down the rotational relaxation of the dye molecule by more than an order of magnitude compared to common organic solvents.

ISSN:0003-6951    

DOI:10.1063/1.1654405

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Passive mode locking of a cw Rhodamine 6G laser is reported. A stable continuous output of picosecond pulses has been achieved. Correlation measurements using second‐harmonic generation (SHG) have determined the pulses to be as short as 1.5 psec. The pulses are transform limited and are wavelength tunable over the range 5900–6100 Å.

ISSN:0003-6951    

DOI:10.1063/1.1654406

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The energy distribution and concentration of electrically active background impurities in GaP have been investigated by observing the current when space charge trapped at these impurities is thermally released within the depletion region of a Schottky barrier formed on the semiconductor. Large‐area Schottky barriers are used for these measurements in order that small concentrations of impurities may be detected. The measurements have been carried out for both liquid‐encapsulated‐Czochralski (LEC)‐ and liquid‐phase‐epitaxial (LPE)‐grown material usingn‐type wafers. In LEC GaP, at least seven electrically active background levels are detectable and these exist at concentrations between 1 × 1015−3 × 1016cm−3, while in LPE GaP only three or four are detectable and these exist in much smaller concentrations of about 1014cm−3.

ISSN:0003-6951    

DOI:10.1063/1.1654407

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A Monte Carlo calculation indicates, to first order, the effect of a 4‐kV/cm atm sustainer field on the primary‐electron dose distribution and the secondary‐electron density distribution in an electron‐beam‐controlled gas‐discharge laser. For the 100‐keV incident electrons considered, the electron range is, at most, doubled by the field and the maximum lateral displacement increases by 50%. For electrodes separated by 1.1 times the no‐field electron range, the secondary electron density has a spatial variation to first order of ± 20%.

ISSN:0003-6951    

DOI:10.1063/1.1654408

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Experimental work was carried out to fabricate three‐dimensional waveguides for integrated optics by masking molecular beams during epitaxy of GaAs and AlxGa1−xAs. We report here some preliminary results of this new technique for fabricating dielectric waveguides.

ISSN:0003-6951    

DOI:10.1063/1.1654409

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The absorption ofp‐type Ge, Si, and GaAs at 10.6 &mgr;m decreases at high intensities. The saturation intensity of Ge, 10 MW cm−2, is sufficiently low for it to be used for passive mode locking of a TEA laser.

ISSN:0003-6951    

DOI:10.1063/1.1654410

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Optical waveguide losses below 5 dB/cm have been measured on single‐crystal epitaxial ZnO films grown on Al2O3. These films promise to be useful in a variety of active integrated optic applications. Comparison of the details of loss measurements with carrier density and mobility measurements gives information on possible loss mechanisms.

ISSN:0003-6951    

DOI:10.1063/1.1654411

出版商:AIP    

年代:1972

数据来源: AIP