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Figure 19-11 shows the experimentally measured output power and gas pressure curve. Output power with axial magnetic field. Axial magnetic field on the discharge tube in the radial motion of charged particles, the role of a Lorentz force, an increase of the axis near the electron and ion density, help to improve the output power. Experiments show that the axial magnetic field can increase the output power of 1-2 times. Axial magnetic field and make the laser line broadening caused by the output power decrease, so there is a maximum power output of the best magnetic field strength (see Figure 19-12). The best value and the discharge current, pressure, diameter and wavelength. As the electrons and ions tend to reduce the impact of the tube to avoid, reduce electrode sputtering in the discharge tube axis, and thus can improve the device lifetime.  stage lighting systems are in famous in the oversea market for its high quality and performance.
Aspects newmaker of semiconductor lasers quantum well (QW) lasers (1) the QW lasers with metal-organic chemical vapor deposition (MOCVD) technology is mature and perfect QW lasers from the laboratory soon developed into commercially available. QW device is the QW material as the active region of optoelectronic devices, material growth is the MOCVD technique. The characteristics of this device lies in the QW active region with a quasi-two-dimensional characteristics and the quantum size effect. QW laser material laser has a threshold current, high quantum efficiency, high frequency oscillation, and directly at a higher temperature. The domestic customers have their own using habits of Laser Pointers.
Strain QW lasers in order to further improve the performance of QW lasers, introduced in the QW strain and compensation strain, there have been strained QW lasers and compensation strain QW lasers. Reduces the limited quality of the hole for the introduction of the strain, and further reduce the transition between the valence band, so that the threshold current of QW lasers to significantly reduce the quantum efficiency and the oscillation frequency is again raised, and reduce the transition of the valence band room and Auger compound to reduce further improve the temperature characteristics of the laser without refrigeration work. In the trap and barrier to the introduction of a different strain (strain / compressive strain) and strain-compensated, can not only improve the quality of the materials. The top seller of stage lighting systems should be the most popular.
To improve the life of the laser, and the compressive strain corresponding to the TE mode, the tensile strain corresponds to the characteristics of the TM mode, the production of semiconductor laser amplifier with polarization-independent. Remarkably, of GaSb-based antimonide materials research over the years much attention, because of its wide wavelength coverage can be extended from 1.7m to 4.5m, but more difficult material growth and device fabrication, device performance indicators by 1990 low. After nearly a decade of efforts, the antimonide strain in MBE growth of GaSb-based quantum well lasers have been in the 1.9 2.6m band has won a breakthrough in continuous high power operation at room temperature. (3) the progress of China's QW lasers. The high economical efficiency of stage lighting systems can save much money for the customer.
China from the end of 1993 AIX200 low pressure MOCVD system for the development of QW devices, has developed dozens of InGaAsP series, the AlGaInAs series of materials and two series of strained QW material, the development of QW devices also achieved fruitful results. completed a number of "863" project has been the formation of the products have the following main devices: (1) General 1.3 m QW lasers, the first practical QW lasers began in 1995 for use in mobile communication optical fiber transmission repeater . Products of the strain the QW DFB lasers, the wavelength coverage of 1.5 ~ 1.57 m, the end of 1996, mass production and formally put on the market. The multiple functions of stage lighting systems can show the high economical efficiency.