Red raygreen laser pointer has the full-blown technology

For this principle is the main drawback of tunable laser tuning time is slower, it normally takes a few seconds settling time tuning. Temperature-based control technology used in the DFB structure, its principle is to adjust the temperature of the laser cavity, which can make different emission wavelengths. Technology based on the principle of regulation is the wavelength tunable laser control InGaAsP DFB lasers rely on the work in the -5 - 50 ℃ to achieve change. Module built-in FP etalon and optical power detection, continuous light output of the laser can be locked in the provisions of the 50GHz ITU grid spacing on. Module has two separate TEC, one to control the laser wavelength, and the other to ensure that the wavelength locking module and power detection probe temperature work. The accuracy of green laser pointer should be ensured at first.
Module has built-in SOA to amplify the output optical power. The disadvantage of this control technology is the tuning width of a single module is not wide, generally only a few nm, and tuning a long time, it normally takes a few seconds settling time tuning. Tunable lasers are now basically control the use of current technology, temperature control technology or mechanical control technology, some providers may use one or both of these technologies. Of course, as technology evolves, there could be other new tunable laser control technology. Laser working substance to silicate crystal matrix of solid-state lasers. Mix of people in the silicate crystals in a variety of different silicate activation of ion lasers available, of which chromium magnesium olive stone mix lasers of the most important and most promising. Mix olive stone magnesium chromium (Cr: Mg2SiO4) laser was born in 1988, with its wide tuning range and by the people's attention. The accuracy of green laser pointer has drawn a lot of customers.
Theoretically Mg2SiO4 laser tuning range of 680 ∽ 1400nm, the experiment has been realized that the harmonic range of 1130 ∽ 1367nm, by improving the crystal quality, it is possible to achieve a step into 840 ∽ 1400nm, the laser tuning range. Cr: Mg2SiO4 activation of ion tetravalent chromium ions, with a large stimulated emission cross section and high quantum efficiency (77%, the efficiency of solid-state laser tuning is the highest). Cr: Mg2SiO4 laser multi-Nd: YAG laser and its second harmonic pumped, mode-locked and Q adjustable, continuous, pulsed operation of a variety of ways, has achieved 60fs mode-locked laser output. Cr: Mg2SiO4 laser output 1.276μm wavelength laser, the wavelength of zero is considered to be material color length, width, pattern, beam diameter, divergence angle, M2 values. Laser waveform measurement usually photodetector to receive light signals into electrical signals and enter the oscilloscope display and measurement. Rough measurement of laser wavelengths available monochromator, accurate measurement of the wavelength meter required. The exact parameter of green laser pointer should be supplied.
Rough measurement of laser linewidth can also be used monochromator, accurate measurement of available spectrometers, standard equipment and so on. Laser mode and the beam diameter measurement method used mobile holes (small holes along the beam cross-section of one-dimensional scanning, simultaneous recording of optical power through the hole) rough measurement, precision measuring device or CCD. M2 value measurement is to measure various physical quantities, respectively, then the definition of M2 value is calculated. Current measurement has been developed for the computer for automatic data processing: two-dimensional CCD device after receiving the laser to produce an electrical signal input for computer processing, can be given directly to the laser wave, ellipticity, divergence angle, Jian waist diameter, M value, the cross section of light graphic three-dimensional intensity distribution of the laser wave with standard waveforms (Gaussian or Lorentz type) of the difference and other parameters. The exact parameter of green laser pointer has been listed in the table.