We report on the development of an all-fiber, 68-kW-peak-power, 16-ps-pulse-width, narrow-bandwidth, linearly polarized, 1064-nm fiber laser suitable for high-power, picosecond-pulse-width, green-light generation. Our 1064-nm fiber laser delivered an average power of up to 110 W at a repetition of 100- MHz in a narrow bandwidth, with minimal nonlinear distortion. We developed a high-power, picosecond green source at 532 nm through use of single-pass frequency-doubling of our 1064-nm fiber laser in lithium triborate (LBO). Using a 15-mm long LBO crystal, we have generated 30 W of average power in the second harmonic with 73-W of fundamental average power, for a conversion efficiency of 41%.
We report here on the performance of a narrow-line, mid-IR source based on a PPLN-crystal optical parametric generator (OPG). The crystal was pumped by a pulsed, 20-MHz-rate, 1064-nm Yb:fiber-based source operating with 20- psec pulses. The OPG produced a broad spectrum between 2027 nm and 2239 nm. By placing a band-pass filter after the OPG we were able to select a 30-nm bandwidth output, and we achieved further line reduction (0.7 nm) and 4.5 mW of average power at 2039 nm, using a reflective Volume Bragg Grating (VBG). Devices such as piezo-controlled etalons can provide rapidly tunable, narrow-linewidth power from this system.
Materials grown by vapor phase techniques such as chemical vapor deposition or hydride vapor phase epitaxy (HVPE)
often exhibit very low losses which are difficult to quantify by simple transmission measurements. The measurement of
extremely low absorption coefficients can be carried out by laser calorimetric or thermal rise techniques, which
determine the absorption coefficients by measuring the temperature increase caused by the absorbed laser radiation. We
report here on results of measuring absorption coefficients of bulk HVPE-grown orientation-patterned GaAs (OP-GaAs)
and GaP (OP-GaP) crystals using one of the methods of laser calorimetry, called transient calorimetry. In our setup, the
sample under test is attached to a high-conductivity copper holder and placed in a vacuum chamber. A 2-micron cw laser
beam is transmitted through the sample and the temperature rise in the sample is measured and, through the calorimeter
calibration process, related to the power absorbed in the sample. The absorbed power, Pa, is a function of the total
attenuation coefficient αtot , the length of the sample, and the laser power Po, defined as Pa = Po exp (-αtot l), where total
attenuation αtot is the sum of absorption and scattering: αtot = αabs + αscat. Since scattered light does not cause heating, the
calorimetric technique is only applicable to determining αabs. By this technique we have measured 2-micron absorption
coefficients in OP-GaAs and OP-GaP as low as 0.007 cm-1.
A compact long-wavelength infrared (LWIR) source, based on the combination of a high-pulse-rate, 1-μm-wavelength solid-state laser with rapid and broadly tunable tandem optical parametric oscillators (OPOs) was demonstrated. Nanosecond pulses with up to 100 μJ energy, tunable within the 8-11 μm LWIR range were achieved.
We report on several developments in solid state lasers and nonlinear optics specifically for applications in remote sensing. In the area of UV sources for ozone monitoring, we have developed an efficient, third-harmonic, tunable Ti:sapphire-laser-based source. For long-range, eyesafe detection of aerosols, we report a high-energy optical parametric oscillator (OPO) driven by a flashlamp-pumped, Q-switched Nd:YLF laser. Finally, for mid-infrared DIAL, we have developed a Tandem-OPO that converts a common Nd-doped laser into a tunable source capable of providing wavelengths in the range 1500-5500 nm and 8000-12000 nm.
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