The green laser pointer is very practical in the daily use

Although titanium doped sapphire laser gain material is commonly used, and as a tunable titanium-doped sapphire ultrafast lasers are widely used in various types of the main components of photonic applications, but it requires high-brightness pump source, usually a few watts of output power argon ion lasers or frequency neodymium laser. Now, based on gallium nitride (GaN) for blue and green laser diode output power of continuous improvement, which makes the Scottish Institute of Photonics, Strathclyde University, researchers were able to demonstrate for the first time directly pumped by a mode-locked laser diode doped titanium sapphire laser. The package of green laser pointer should be firm.
Unlikely to achieve results due to the blue and green laser diode output power is usually low, and their wavelength and Ti sapphire gain a wide range of materials, but the low efficiency of absorption spectrum does not match, so the laser industry always that it was impossible to achieve with a diode-pumped titanium sapphire laser generated. However, the Japanese company Nichia small wavelength of 452nm GaN laser diode to achieve 1W output power, they can already be used to pump Ti sapphire laser. The standard laser cavity design, output 800nm, 19mW of continuous light (Figure). The safety consideration ofgreen laser pointer should be considered.
Figure: Nichia's blue laser diode business (right) was first used for a small device (the lower part of the optical path diagram), titanium-doped sapphire laser as the pump source of low-cost to replace the traditional bulky, cost high frequency solid state laser (left). In order to achieve laser output, the researchers used an aspheric collimating lens, a cylindrical lens formed by the two telescopes and a spherical lens, the laser diode output light is focused to a four-mirror cavity Ti sapphire crystal on. The calculated crystal cavity waist radius of 25 × 15μm. The workshop has done something about the safety consideration ofgreen laser pointer.
0.5% output coupling conditions, the light incident on the crystal when the power is 870mW, 750mW can be mode-locking threshold and the 9mW of the maximum average output power. Use of interferometric autocorrelation method, the measured output of the transform limited FWHM pulse width of 116fs. The current measured output power is lower than the expected value model calculated. The researchers believe that this is due to launch at the pump laser wavelength caused by the loss. But when the wavelengths greater than 477nm, it is difficult to detect loss. As the longer wavelength of GaN laser diode technology has made progress, so the research team believe that further experiments can quickly create a higher output power direct diode laser pumped Ti sapphire. The effective tool contains the green laser pointer.
Even with the current 452nm pump laser diode as well as bilateral or polarization technology, and researchers still believe we can get around 50mW of output power. Doctoral student Peter Roth said: "Ti-doped sapphire laser diode pumped laser can significantly reduce the complexity of existing systems, so in the near future, we need only to spend the existing cost and a fraction of the space, you can get Today, these high-cost desktop Ti sapphire lasers have unmatched performance. The green laser pointer is very practical in the daily use.