By P. Das (auth.)
A textbook on lasers and optical engineering should still comprise all points of lasers and optics; even though, it is a huge project. the target of this booklet is to offer an creation to the topic on a degree such that below graduate scholars (mostly juniors/seniors), from disciplines like electric engineering, physics, and optical engineering, can use the publication. to accomplish this objective, loads of simple history fabric, vital to the topic, has been coated in optics and laser physics. scholars with an uncomplicated wisdom of freshman physics and with out formal classes in electromagnetic thought will be capable of keep on with the e-book, even though for a few sections, wisdom of electromagnetic conception, the Fourier rework, and linear structures will be hugely useful. There are very good books on optics, laser physics, and optical engineering. really, such a lot of my wisdom used to be got via those. despite the fact that, while i began instructing an undergraduate path in 1974, lower than an analogous heading because the identify of this e-book, I needed to use 4 books to hide the cloth i assumed an electric engineer wanted for his creation to the area of lasers and optical engineering. In my sabbatical yr, 1980-1981, i began writing type notes for my scholars, in order that they may perhaps get throughout the path by way of probably purchasing just one booklet. ultimately, those notes grew with the aid of my undergraduate and graduate scholars, and the ultimate result's this book.
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Additional resources for Lasers and Optical Engineering
The Aperture Stop To understand the aperture stop, let us first consider the simple case depicted in Fig. 1. 1) under paraxial approximation and for the object distancle u. 2) and as D2 > D1 , the image in the second case will be brighter. Thus, we see 34 I. Geometrical Optics I ~al I I (0) D2 I (b) I I I I I I I I I 1______ l·u/2- I I-ur----:: (c) I I -3u- 4" -u- (d) Fig. 1. Aperture stop for optical systems. that in this simple case the size of the lenses determines the aperture stopand the second lens has a larger aperture stop.
The image formation using ray tracing is also shown in Fig. 4. 5. The Telescoping System If M21 = 0, then the equivalent thin-lens formulation that we have discussed earlier does not hold good. These systems are called telescopic systems. 3. As shown in Fig. 2) The last equality is obtained by noting that the determinant of the M matrix is 1. ~------z-------. System (M) • ,~ f-------z --~ ----1 Fig. 1. A telescopic system. 30 I. 5) An important quantity for the telescopic system is the longitudinal magnification.
When the optical energy is incident on a surface we define the radiant incidence (N) to denote the incident power per unit area. Note that the element of area, dA, must be perpendicular to the direction of the light propagation. Otherwise, a cos (J factor must be included if the normal to the area is not parallel to the direction of the light propagation. This is shown in Fig. 1. Using vector notation, where the element of area, dA, is represented by a vector having magnitude dA, and direction along its normal, then we obtain the incident power to be given by P = f.
Lasers and Optical Engineering by P. Das (auth.)