This kind of laser pointer can be used to point at any desired targets

As an alternative to the traditional larger, higher-cost frequency doubling solid-state laser (left). In order to achieve the laser output, the researchers used an aspheric collimating lens, a telescope constituted by two cylindrical lenses and a spherical lens, the laser diode output light is focused to a four-mirror cavity of the titanium-doped sapphire crystal on. The calculated crystal cavity waist radius of 25 × 15μm. Output coupling of 0.5% under the conditions of the incident to the crystal optical power of 870mW 750mW clamping threshold, as well as the 9mW of the maximum average output power can be. Interfere with the output of the autocorrelation method, the measured finite transformation FWHM pulse width 116fs.   green laser pointer adopts the specific metal material.
Measured output power is lower than the modeling to calculate the expected value. The researchers believe that this is the loss caused due to the wavelength of the laser-pumped. But when the wavelength is greater than 477nm, it is difficult to detect the loss. Progress has been made due to the longer wavelength of GaN laser diode technology, the research team believes that further experiments can quickly create a higher output power diode pumped directly titanium-doped sapphire laser. Even with a 452nm laser diode current as well as bilateral pump polarization combinations, the researchers still believe we can get the output power of about 50mW. It can make green laser pointer more durable to use.
Doctoral student Peter Roth said: "titanium-doped sapphire laser diode laser pump can significantly reduce the complexity of existing systems. Therefore, in the near future, we need only spend a small portion of the existing cost and space, can be obtained Today, these high-cost desktop-doped titanium sapphire laser with unmatched performance by multiplexing two existing GaN diode lasers (one for each device at the 450nm wavelength at the output power of about 1W), will be expected to be average output power of about 50W tunable femtosecond titanium sapphire laser, the laser can be achieved from imaging spectroscopy of a variety of applications, such as fluorescence microscopy accessories. This kind of    laser pointer can be used to point at any desired targets.
The femtosecond laser is one of the most powerful new tools for the past 20 years by the development of laser science. Femtosecond pulse is so short, and has now reached 4fs within (visible - near infrared band). A femtosecond (fs), ie, 10-15s, only 10 million billionths of a second to 10 fs as a geometric average to measure the universe, its life expectancy is only 1min.; Femtosecond pulse is so strong, multi- level chirped pulse amplification (CPA) technology to obtain the maximum pulse peak power can reach 100 terawatt (TW, ie, 1012W) and even petawatt (PW, ie, 1015W) order of magnitude, its focused intensity solar radiation on Earth All light is focused into a needle-like size of the energy density is even higher.  green laser includes the projection screen, lecture screen and so on.
The femtosecond laser is the miracle of human creation. Past two decades, from the dye laser to the Kerr lens mode-locked Ti gem femtosecond lasers, and diode pumped solid-state femtosecond lasers and femtosecond fiber laser, although the femtosecond laser pulse width and energy record is constantly refreshed, but the greatest progress than the ultra-femtosecond pulse becomes easy. R.Trebino, Sandia National Laboratories, said: "Over the past 10 years, (ultrafast) technology has significantly improved titanium sapphire laser and fiber laser is to make this (femtosecond) laser operation becomes simple and stability of such lasers now be able to buy 10 years ago, but you must establish. " 200mw laser pointer can be used in many locations.