Telescopic Lasers for PIV | ||

¤ýÀÛ¼ºÀÏ: 2009-10-07 (¼ö) 20:36 | ¤ýÁ¶È¸: 1814 | |

LAN_20TelLasersforPIV_0104_1.pdf (176KB) (Down:188) |
www.litronlasers.com (Down:271) |

Broader, Thinner and More Uniform Light Sheets Litron offers telescopic versions of its popular Nano L and LPY PIV laser systems for dual pulse applications requiring a significantly lower M2 value than traditional lasers but with the excellent spatial uniformity of a conventional resonator. This gives the possibility to make broad, thin, uniform light sheets for large area or high resolution PIV studies. Litron can achieve a beam divergence as low as 0.8mrad at 532nm by placing a telescope inside the resonator. This is around four times lower than with a conventional laser and around twice that of a Gaussian coupled laser. However, the Gaussian coupled laser suffers from poor mid-field spatial uniformity, leading to non-uniform illumination of the experimental area. Beam divergence does not tell the whole story. A ¡®figure of merit¡¯ for comparing a laser beam¡¯s focusability is M-squared. A theoretically perfect laser beam has an M2 value of one and real lasers have values of greater than one; the actual value of a real laser beam denotes how many times narrower or thicker a light sheet will be compared with a sheet from a perfect beam. For Gaussian unstable lasers, M2 is typically less than the value predicted by measuring the divergence and beam diameter at the output; the two values are usually closely related for stable lasers. For PIV applications, a four times lower M2 value means that a light sheet can be four times thinner for a given propagation distance or else four times longer for a given thickness. For more information contact: Litron Lasers Email: sales@litronlasers.com Comparison of Laser Types M2 Value Light Sheet Extent Light Sheet Uniformity Conventional Stable ~12-15 Fair Excellent Gaussian Unstable ~1.6-1.8 Excellent Poor Telescopic Stable ~3.5 Very Good Excellent È¨ÆäÀÌÁö : www.litronlasers.com
Á¦Á¶±¹ : UK Ãß°¡ ¹®ÀÇ»çÇ×ÀÌ ÀÖÀ¸½Ã¸é ¿¬¶ôºÎÅ¹µå¸³´Ï´Ù. (ÁÖ) ¿¤ÅõÄÉÀÌÇÃ·¯½º Tel ) 042-934-7744 |