Latest Impact Factors from Optics Journals

We are pleased to bring you the latest Impact Factors from Elsevier's Optics journals. Highlights include...

Optical Materials

2007 Impact Factor
WAS
1.519

2008 Impact Factor
NOW
1.714

Journal Of Luminescence

2007 Impact Factor
WAS
1.611

2008 Impact Factor
NOW
1.628

Optics Communications

2007 Impact Factor
WAS
1.314

2008 Impact Factor
NOW
1.552

Optical Fiber Technology

2007 Impact Factor
WAS
0.845

2008 Impact Factor
NOW
1.253

Listed by highest Impact Factor
Journal Title	2007 Impact Factor WAS	2008 Impact Factor NOW

Photonics And Nanostructures - Fundamentals And Applications	2.000	1.940
Journal Of Quantitative Spectroscopy & Radiative Transfer	1.972	1.635
Optics And Lasers In Engineering	0.872	1.103
Infrared Physics & Technology	0.962	1.037
Optics And Laser Technology	0.872	0.892

Calculating Impact Factors

WHAT IS AN IMPACT FACTOR?
The journal impact factor is a measure of the frequency with which the average article in a journal has been cited in a particular year. The impact factor helps you evaluate a journal's relative importance, especially when you compare it to others in the same field. The impact factor is calculated by dividing the number of citations in the current year to articles published in the two previous years by the total number of articles published in the two previous years.

Using Journal X as an example:
Cites in 2007 to articles published in:	2006 2005 Sum	= 1266 = 1643 = 2909

Number of articles published in:	2006 2005 Sum	= 352 = 364 = 716

Calculation:	Total cites to articles published in 2005 and 2006	2909	= 4.063
	Number of articles published in 2005 and 2006	716

The 2007 Impact Factor for Journal X is 4.063