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harmonic conversion
It is shown that, in such crystals, the maximal efficiency of fundamental-to-second harmonic conversion is low, and the dependence of the average intensity of the second harmonic on the fundamental intensity differs considerably from a square law.
      
The maximum 2nd-harmonic conversion efficiency exceeded 20% and provided an output power of 3.7 mW for making continuous frequency scans of up to 600 MHz in the green.
      
Third harmonic conversion efficiencies in these metallocomplexes were measured to be 8×10-7 and 5×10-7 respectively.
      
We first optimized the high harmonic conversion efficiency in argon by studying the best experimental conditions for phase-matching, concentrating on focus geometry related to laser energy, cell length and position relative to the focus.
      
Third-harmonic conversion of hexamethylindocarbocyanine iodide, diethyloxacarbocyanine iodide and fuchsin red are compared.
      
Coherent radiation at 89.6 nm has been obtained through third-harmonic conversion of the 268.8 nm pulses in mercury vapors.
      
Neglecting pump depletion, it is found that for samples of well-defined symmetry, the second harmonic conversion efficiency scales with film thickness, with no observed enhancement owing to coherence length effects.
      
At a pump pulse peak intensity ofI10=5×1010W/cm2 a third-harmonic conversion efficiency of a percent is obtained.
      
Multiple harmonic conversion of pulsed CO2 laser radiation in Tl3AsSe3
      
Finally, we report a study of the dependence of the harmonic conversion efficiency on relative position of the focus and the gas target.
      
Starting from an 850?mW diode-pumped actively mode-locked Nd:YAG laser at 1.064?μm with 100?MHz repetition rate and 25?ps pulse duration, we performed 54% harmonic conversion efficiency in the green.
      
Second-harmonic conversion of the 532-nm pulsed output of a doubled Nd:YAG laser in KDP was characterized by analyzing the changes in the acoustic signals generated in the crystal at different orientation conditions and for several incident fluences.
      
Harmonic conversion efficiencies of (3-4)×10-8 in the range of 10-13?nm in neon and some two orders of magnitude higher at around 30?nm in argon have been obtained in simple gas tube targets under these conditions.
      
The dependence of the high-harmonic conversion efficiency in noble gases on experimental parameters is analyzed.
      
Results of our numerical calculations show that a two-color filamentation effect occurs, in which the third-harmonic conversion efficiency remains almost constant over the whole filament length.
      
To overcome limitations in the high harmonic conversion efficiency, the possibility of parametric amplification in the VUV and XUV is considered.
      
Enhanced harmonic conversion efficiency in the self-guided propagation of femtosecond ultraviolet laser pulses in argon
      
We show that the double grating feedback improves the second harmonic conversion efficiency by several orders of magnitude as compared to the freely running laser.
      
In this report we examine the second harmonic conversion characteristics of a 3.8?mm thick birefringently phase matched Yb:YAB crystal which is then examined in more detail by slicing into four thinner sections each approximately 400?μm thick.
      
Variation of the minimum pulsewidth with intracavity bandwidth and the harmonic conversion efficiency is presented in the form of graphs.
      
 

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