This is effectively a point light source in combination with a collimating lens.

In a typical system, illumination is provided by a diffuse source set at the focal plane of a collimating lens.

Image before rhabdom, then collimating lens, no image point, parallel beam like telescope (2g).

Using a point-like source for light and a collimating lens it is possible to make parallel light, which will then be passed through the slit.

Laser diodes emit less-collimated light due to their short cavity, and therefore higher collimation requires a collimating lens.

Collimating Lenses -Gx All laser diode modules supplied by Laser 2000 are factory fitted with a collimation lens as standard.

In the original spectroscope design in the early 19th century, light entered a slit and a collimating lens transformed the light into a thin beam of parallel rays.

This new concept in laser module design allows a laser diode, an adjustable collimating lens and a drive circuit to be incorporated within a body which is just 23mm long and all without compromising the performance.

This tactical laser is equipped with a versatile focus-adjustable collimating lens to compensate for range and power intensity when used at close range to incapacitate an attacker, at a distance to safely identify threats.

CUV-UV Cuvette Holder Cuvette Holder, 10mm path, includes 2 UV collimating lenses CUV-UV £335.00 All three cuvette sample holders are designed for transmission/fluorescence measurements using a 10x10mm cuvette.

Mixed wavelengths（λ1、λ2、λ3）from optical fiber, After the collimating lens (L1) post-directed to the grating，the optical signals of different wavelengths due to the different diffraction angle, is focused to different position through the lens (L2),then the optical signal is coupled into different optical fiber for output.

Collimating Lens - UV UV collimating lens, incl. SMA conn., adjustable focus COL-UV £74.00 The collimating lenses convert divergent beams of light into a parallel beam.

In addition, When the width of the prism surface is appropriately increased, and as far as possible to reduce the diameter of the collimating lens, You can get the best performance of the spectral effects, The lens, in the above system can be used to replace the self-focusing lens, its effect is completely the same.