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Mode quality

The choice of laser system is dictated by the considerations outlined above. High-energy pulses of two different frequencies are needed, and good temporal synchronization between the pulses is essential. A pulse width of 0.3-1.0 ps is adequate to resolve most dephasing processes. Good mode quality is important to minimize self-focusing. [Pg.419]

An alternate approach used by the Miller group is to pulse amplify a CW dye laser. This approach degrades the laser resolution from about 1 MHz to about 200 MHz but results in a high-power pulsed laser beam with excellent mode quality. This high peak power and high spectral resolution results in excellent spectra with an improved S/N ratio. The only serious drawback of this scheme is the increased complexity and cost of the laser systems. [Pg.14]

However, the high peak power at higher pulse energies can make it more difficult to maintain good mode quality as the laser beam propagates. [Pg.25]

A typical experimental set-up for SHG is shown in Fig. 5.2. For excitation nowadays one usually uses either a mode locked Ti Sapphire laser, that delivers 100 fs pulses at a rate of about 80 MHz, or a pico or nanosecond Nd YAG laser, often in combination with an optical parametric oscillator (OPO). Whereas the first type of system gives a superior mode quality and stability but limited tunability, the second system is more convenient for SHG spectroscopy. [Pg.219]

For some applications, it is necessary to produce RGH lasers at a reasonable output power level with low spatial divergence and narrow bandwidth. To fulfill these requirements, use of either a master oscillator/power amplifier system or an injection-locked resonator is the most convenient method. Figure 26 shows a schematic of an injection-locked resonator. In this scheme the slave oscillator is an unstable resonator that can control the output energy and spatial mode quality. Input pulse can be made by a master oscillator typically consisting of a cavity with a line-narrowing function. An input power level on the order... [Pg.122]

Advantages of the SFR laser are its high output power (about IW for CW operation), its relatively large tuning range and its good mode quality at single-mode operation. [Pg.306]


See other pages where Mode quality is mentioned: [Pg.85]    [Pg.157]    [Pg.40]    [Pg.254]    [Pg.86]    [Pg.420]    [Pg.152]    [Pg.6]    [Pg.9]    [Pg.54]    [Pg.317]    [Pg.33]    [Pg.33]    [Pg.125]    [Pg.645]    [Pg.60]    [Pg.61]    [Pg.61]    [Pg.62]    [Pg.426]   
See also in sourсe #XX -- [ Pg.125 ]




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