Continuously tunable optically pumped high-pressure DF → CO2transfer laser

The operational characteristics of a continuously tunable DF → CO2transfer laser optically pumped with radiation from a pulsed DF laser are experimentally and theoretically studied. The pump radiation is absorbed by DF in a high-pressure DF/CO2/He gas mixture, and subsequent V-V energy transfer to the CO2ν3mode provides the CO2laser population inversion. Continuous tuning of the CO2laser frequency between five CO2line centers from 29.14 to 29.30 THz has been demonstrated, using a 12 atm gas mixture. The maximum pulse energy was about 0.8 mJ. In experiments with a two-mirror CO2laser resonator, pulse energies up to 6 mJ and 35 percent slope quantum efficiency have been obtained at 10 atm gas pressure. The gas mixture typically contained 0.5 percent DF, 5 percent CO2, and 94.5 percent He, but this was not critical. Computer simulations based on a rate equation model of the laser have given results which are in reasonable agreement with those obtained experimentally.     

High-pressure xenon laser at 1730 Å

Experimental measurements are reported of optical gain due to stimulated transitions between the lowest-bound diatomic states of xenon (Xe) and the repulsive ground state. The optical gain was greatest at a wavelength of (1730 ± 10) Å, where the effective gain cross section is estimated to be7 times 10^{19}cm².     

Mode-locked flashlamp-pumped coumarin dye laser at 4600 Å

A flashlamp-pumped coumarin dye laser mode-locked by means of intracavity loss modulation has produced subnanosecond, millijoule pulses suitable for pumping other dye lasers or for application to fast photochemical reaction studies.     

CW laser oscillation at 5433 Å in neon

Laser action in BBD and isopropyl-PBD pumped by the N2laser has been observed. The energy outputs, optimum concentrations, and wavelength ranges for several ultraviolet-lasing dyes were also determined.     

Nearly noncritically phase-matched UV generation at 3547 Å in NaCHO2

Sodium formate (NaCHO2) has been found to be very nearly noncritically phase matchable for type-2 frequency mixing of the Nd:YAG laser fundamental and second-harmonic radiation at room temperature. The nonlinear optical constant was determined to be d32(NaCHO2) =(1.25 pm 0.25) times 10^{-9}ESU.     

High-power difference-frequency generation at 5-11 µm in AgGaS2

Efficient generation of high peak power and high average power difference-frequency radiation, continuously tunable over the range of5-11 mum, has been achieved by mixing the Nd:YAG laser radiation with the output of an infrared dye laser pumped by the same Nd: YAG laser in AgGaS2. Peak pulse powers as high as 180 kW with an average power output of 14 mW were obtained around 6 μm.     

CW laser oscillation at 6127 Å in singly ionized iodine

CW laser action has been obtained on the 6127-Å transition ofI(II) in a He-CdI2discharge. Relative output power has been measured as a function of discharge current, helium pressure, and CdI2temperature.     

A Gd2(MoO4)3longitudinal electrooptic modulator at 6328 Å

A Gd2(MoO4)3light modulator operating at low frequencies, from 100 Hz up to 1 MHz, is examined. Experimental results concerning the thermal behavior and stability, frequency response, and linearity performance characteristics of the system are presented. Advantages and disadvantages of the modulator are discussed.