摘要:

The small‐signal gain and absorption of an electron‐beam‐excited KrF* laser mix was measured by probing the excited medium with a frequency‐doubled flashlamp‐pumped dye laser. The mixture contained 0.3% F2, 6% Kr, and 93.7% Ar. The doubled dye laser was used to determine the single‐pass gain or loss of this e‐beam‐excited mixture over the KrF* (2&Sgr;1/2→2&Sgr;1/2) emission band. The KrF* and other relevant excited‐state number densities under the condition of the experiment were determined from a comprehensive kinetic model. The effective KrF* stimulated‐emission cross section was determined by dividing the measured gain per centimeter on line center by the excited‐state number density.

ISSN:0003-6951    

DOI:10.1063/1.89625

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

A recently developed simple photopreionization‐stabilized discharge scheme was adapted successfully to the excitation of XeF and KrF lasers at pressures of 0–1500 Torr. The authors report on the stabilization and excitation characteristics of F2and NF3 : Xe : He discharges over a wide range of energy loadings. These results summarize and compare the detailed fluorescence and gain measurements. The (nonoptimized) XeF output energies of ∼1 J/liter compare favorably with those of other devices.

ISSN:0003-6951    

DOI:10.1063/1.89626

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

We have constructed and tested an optical multiplexer for use with multimode optical fibers. The device utilized a blazed plane reflection grating with a single GRIN‐rod lens, and was made from commercially available components. The wavelength spacing of the two channels was 27 nm, the insertion losses were ⩽2.4 dB, and the crosstalk was <−30 dB. Optimized versions of the device should be capable of providing at least four channels, with still lower insertion losses, in a rugged stable package 1–2 cm long by 2–4 mm in diameter.

ISSN:0003-6951    

DOI:10.1063/1.89627

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

We report the observation of an extended series of integral harmonic lines in the spectrum of direct backscatter of 10.6‐&mgr;m radiation incident at intensities ≳1014W/cm2onto planar solid targets. We have observed and spectrally resolved up to the eleventh harmonic (0.95 &mgr;m) at intensities well above the plasma continuum background.

ISSN:0003-6951    

DOI:10.1063/1.89628

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

An improved (CVD) method was developed to fabricate long fibers. He gas mixed with O2and raw material vapors were introduced into the CVD gas system to increase the deposition rate. This produced a sixfold increase compared to the conventional method. In addition to GeO2, a small amount of P2O5was added as a dopant to the fused silica to lower the fusion temperature of the deposited soot and minimize tube deformation during the deposition process. Step index fibers 8.5 km long were prepared. These exhibited a mean loss of 4.4 dB/km at a wavelength of 0.85 &mgr;m. The outer and the core diameters were 125 and 62.5 &mgr;m, respectively.

ISSN:0003-6951    

DOI:10.1063/1.89637

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

A CO2waveguide laser with a silicon cathode is described. Laser action can be obtained at pressures over 4 atm without preionization. At atmospheric pressue specific outputs as high as 5 J/l have been obtained, and the laer operated at pulse repetition frequencies up to 1 kHz.

ISSN:0003-6951    

DOI:10.1063/1.89638

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

A simple miniature room‐temperature pulsed NdP5O14laser excited by a small Xe flash lamp has been made, with threshold energies of a few hundred millijoules. Output energies of 1.5 mJ have been obtained with less than 1 J input, and an order‐of‐magnitude improvement is expected.

ISSN:0003-6951    

DOI:10.1063/1.89639

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Vacuum ultraviolet laser emission was obtained from highly ionized noble gases using a simple longitudinal discharge device. Electric discharge excitation pulses with 500 ns duration and peak current density up to 14 000 A/cm2produced lasing on five argon and krypton ion transitions below 200 nm. The two strongest emissions exhibited 0.1–1 kW peak power from Kr IV at 195.027 nm and 175.641 nm.

ISSN:0003-6951    

DOI:10.1063/1.89640

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

Direct measurements using a picosecond streak camera have shown that transform‐limited pulses having durations ∼5 psec are produced throughout the pulse train of a mode‐locked neodymium‐phosphate glass laser operating in the TEM00mode. Under the conditions of higher‐power multimode operation, bandwidth‐limited pulses are generated in the initial part of the train only. Spectral and temporal broadening due to intensity‐dependent nonlinear effects are observed as the higher‐power mode‐locked trains evolve.

ISSN:0003-6951    

DOI:10.1063/1.89641

出版商:AIP    

年代:1977

数据来源: AIP

摘要:

The spectral phase‐matching bandwidths in LiIO3, LiNbO3, CDA, and KDP (type I and type II) for second harmonic generation (SHG) at 1.06 &mgr;m have been accurately measured using a tunable line‐narrowed Nd : glass laser. The present results disagree with previously published data. Mechanisms such as sum‐frequency generation which could contribute to the discrepancy are discussed and demonstrated in a 90° phase‐matched deuterated CDA crystal.

ISSN:0003-6951    

DOI:10.1063/1.89642

出版商:AIP    

年代:1977

数据来源: AIP