Infrared pulses of 1 picosecond duration tunable between 4 mu m and 18 mu m

Biexponential intersubband relaxation in n-modulation-doped quantum-well structures

“…The infrared pulses tunable between 5 and 18 m and of 1 to 2 ps duration are generated by difference frequency mixing [14]. A Nd:glass laser pumps a travelling wave, near-infrared dye laser.…”

Difference-frequency mixing of output waves from a periodically poled lithium niobate optical parametric oscillator in a GaSe crystal

“…8 In this paper we report on a Nd:YAG-laser-pumped PPLN OPO and on extending its tuning range by mixing of its output waves in GaSe crystal to generate tunable radiation from 4.35 to 14.25 m.…”

High-repetition-rate femtosecond optical parametric oscillator–amplifier system near 3 μm

“…34,35 Other methods that can be used to generate ultrashort pulses in the mid-infrared spectral region include the free electron laser, 2,3 color-center lasers, 36 and differencefrequency mixing. 4,11,37 The OPO -OPA system offers distinct advantages over these methods for generating high-repetition-rate, high-peak power femtosecond pulses in this wavelength region. Free electron lasers have been shown to be capable of performing nonlinear spectroscopic measurements in the mid-infrared region.…”

“…36 Finally, difference-frequency mixing is capable of generating short pulses with sufficient energy in the mid-infrared region. 4,37 But the high laser energies that are necessary to obtain a useful amount of infrared light require low-repetition-rate amplifiers (#1 kHz) for the mixing pulses. As is shown below, the OPO -OPA combination offers superior conversion efficiencies when compared with those obtained from difference-frequency mixing.…”