Linear Flashlamps Research Articles

Sixteen new IR laser dyes

Sixteen new IR laser dyes are reported. All lased successfully under excitation from a simple linear flashlamp of about 700-ns rise time. Untuned lasing wavelengths ranged from 810 to 972 nm. Laser output pulse energies from the four best of these dyes were 5-15 times greater than from diethylthiatricarbocyanine iodide (DTTC), with peak output of about 50 mJ obtained from 128-J excitation. Solvent effects with four selected laser dyes are also discussed.

Operating characteristics of a linear flashlamp-pumped dye laser using a coaxial dye cell

The use of a coaxial dye cell in a linear flashlamp pumped dye laser is discussed. The characteristics of the flashlamps used are reported, illustrating the variation in peak power and energy at different emission wavelengths of the xenon discharge. Thermal lensing, encountered when using a coaxial dye cell is reported and its effect on the performance of the laser demostrated.

Sixteen new infrared laser dyes excited by a simple, linear flashlamp

Sixteen new infrared laser dyes excited by a simple, linear flashlamp

Wavelength tunability of new flashlamp-pumped laser dyes

The wavelength tunability of six new flashlamp-pumped laser dyes is presented. The dyes were pumped with linear flashlamps and tuned by using a grating as one mirror of the laser cavity.

Passive mode-locking of flashlamp pumped Rhodamine dye-lasers

A simple dye-laser system is described in which Rhodamine dyes are pumped by a co-axial linear air flashlamp in a cylindrical elliptical pumping reflector. Output pulses lasting up to 1.5μsec and containing up to 250 mJ energy, have been successfully mode-locked to produce 100% modulated pulse trains. Employing a diffraction grating as cavity reflector to tune the laser frequency, in each case, for maximum absorption by the same Q-switching dye, successful mode-locking has been achieved with both Rhodamine B and Rhodamine 6G. Time resolved emission spectra have been recorded with an image tube streak camera and the effect of resonant reflectors has been studied.

Maximum Ratings for Xenon Filled Linear Flashlamps

An approximate mathematical analysis of wall loading and energy dissipation is presented in lieu of comprehensive (and expensive) destructive testing, with the aim of extending previously published maximum peak current ratings for a given lamp type to flashtubes having various length/diam ratios and operating in multisection LC discharge lines (pulse forming networks). A second peak current rating, independent of pulse duration, is tentatively established in an attempt to predict failures from excessive current buildup rates.

Characteristics and Operation of Xenon Filled Linear Flashlamps

Following a discussion of flashtube impedance and its dependence upon discharge current, the relation between current magnitude, initial charge voltage, circuit constants, and lamp dimensions is derived for lamps operating in pulse forming networks of cascaded LC pisections. The resulting equation, I=0.27(d/l)23(C/L)13V43, has been experimentally verified by data from flashtubes having arc lengths ranging between 7.6 and 91.5 cm. When, as is often the case, a flashtube is operated in series with a single inductor, the current pulse is not rectangular and the assumption of constant discharge resistance used in the multisection line study is invalid. A more precise analysis has been carried out with the aid of a digital computer in which the differential equation for a series RLC circuit is solved with the nonlinear condition R=Rw+R(i). Inclusion of wiring resistance Rw permits further extension of the solution's applicability and the results are found to agree well with experiment.