Compact tunable mid-infrared laser source by difference frequency generation of two diode-lasers

Near- and mid-infrared laser monitoring of industrial processes, environment and security applications

“…In Fig. 2 in this investigation is shown, and a detailed description can be found in [12]. The radiation of the two input lasers is overlapped and focused into a non-linear optical crystal.…”

“…OPOs, which can be tuned over a wide spectral range, are used frequently for analysis in the laboratory, but these often very complex systems cannot be easily moved to the measurement site. DFG using two diode lasers as a pump and a signal source provides narrow line width, excellent beam quality, wide tunability and portable design [8][9][10][11][12]. However, also the disadvantages of diode lasers, especially their discontinuous tunability and lowoutput power are transformed to the mid-infrared spectral range.…”

LiNa5Mo9O30: Crystal Growth, Linear, and Nonlinear Optical Properties

“…[1][2][3][4][5][6][7] These materials are indispensable for semiconductor lithography and a variety of scientific instrumentation. In addition to exhibiting structural non-centrosymmetry, i.e.…”

Mid-infrared laser-tomographic imaging of carbon monoxide in laminar flames by difference frequency generation

“…The output signal of the detector was processed with a lock-in amplifier, in conjunction with amplitude modulation using a mechanical chopper. With this setup, the typical detection limit for CO was 5 ppm·m for the CO P(26) line at 4.92 µm [17]. A spectral resolution of 1.2 × 10 −2 cm −1 illustrates the high selectivity of the spectrometer.…”

“…Recent progress in MIR laser technology provides conventional lead salt diode lasers [14], but also quantum cascade lasers (QCLs) [15], optical parametric oscillators (OPOs) [16], and difference frequency generation with conventional NIR lasers as signal and pump sources (DFG) [17,18]. However, there are still many problems limiting the applicability of these systems.…”