Collimated Multi-Wavelength LED (365-980nm) | SIMTRUM

Product Brochure: Collimated Multi-Wavelength LED

An LED collimator consists of a collimating lens and an LED emitter. The LED emitter is placed at the focal plane of the collimating lens. The collimating lens thus images the LED emitter into infinity. LED collimators employ a high-NA aspherical collimating lens for precision collimation and high light throughput.The LED emitters are mounted directly onto the metal base of the collimator which also features an integrated heat sink. This configuration minimizes thermal resistance between the LED emitter and the heat sink resulting in better heat dissipation. The collimating lens can be adjusted if needed for precise collimation. A locking ring fixes the lens position after adjustment. The collimators have been pre-adjusted in the factory.

Multi-chip LED emitters have been added to the product portfolio (Type-B). Some of these 7W to 15W LEDs have total optical power exceeding 1W, quadrupling the power of a single-chip LED. Models with higher powers (7W and higher) feature a cooling fan and have a different formfactor compared to other models. Please examine the installation drawings carefully. Power supply for the cooling fan is included in the price of the LED collimator sources.

The LED collimators include a 1.5-meter cable with two bare-wire terminals at the end. The light sources can be driven by LED controllers or other LED controllers and current sources. An optional focusing module can be mounted on the front of the LED collimator to focus light into a tight spot which is an image of the LED emitter. One of the applications with the focusing module is coupling LED light into a fiber or a light guide.

An optional light guide adaptor is also available to couple the LED light into a lightguide, as shown in the photo below.

Type-A LCS (passively cooled with no cooling fan)

Type-B LCS (with a cooling fan)

Type-J LCS (high power, passively cooled with no cooling fan)

Type-H LCS (high current, with a cooling fan)

Product Brochure: Collimated Multi-Wavelength LED

Multi-Wavelength beam combiners combine two LED collimators of different wavelengths into a single collimated beam. Multiple combiners can be cascaded to combine more than two LED collimator sources. At the heart of the beam combiner is a high-performance dichroic beam splitter that combines two wavelengths with >95% efficiency. A neutral beam splitter is also available as a lower-cost solution for applications where maximum light throughput is not required.Beam combiners are characterized by the edge wavelengths of their dichroic beam splitters. Please use the following diagram and check the Specification table to select the correct beam combiner for intended LED collimator source.

The beam combiner includes multiple mounting holes and threads so that it can be easily integrated into a system. Each input port features a fine 2-axis tilt adjustment to allow precise alignment of the LED collimator sources relative to system optical axis. A robust locking mechanism is also provided to maintain alignment over time. Additionally, adaptors are also available for coupling to major brands of microscopes.

Adding optical filters to the input ports

A filter well (see diagram below) is integrated into each input port so that a φ1” or φ25mm optical filter can be inserted in between the LED source and the beam splitter. Narrow band filters and polarizers may be used to clean up LED spectrum or change the polarization state of the output beam. Here is the dimension requirement for the dichroic/beamsplitters to be fit into the beam combiner cubes:
○ Length: 34~36mm
○ Width: 25~26.5mm
○ Thickness: 1mm recommended, 1.5mm max.

Connecting 11-mm aperture collimated LED sources

Currently, multi-wavelength beam combiners can only be used to DIRECTLY combine 22mm-diameter Collimated LED Sources. For 11mm-diameter collimated LED sources, (as shown below) a mechanical adaptor (P/N: ACC-BC25-011) can be used to attach the LED sources to the beam combiners, before the 11-mm diameter collimated LED sources can be combined.

Model Choice & Specifications

Clear Aperture: 25mm diameter
Compatible LED collimator sources: LCS-xxxx-xx-22, 22mm diameter LED collimator sources Weight: 190g

Multi-Wavelength Collimated LED Sources can be constructed by combining the following components:

• Mightex multi-wavelength beam combiners; and

• Mightex collimated LED sources.

As shown in the pictures below, depending on the specific configuration geometry, Multi-Wavelength Collimated LED Sources can be largely categorized into two groups:

(1) “Straight-through” type, in which each additional LED/wavelength is added to the assembly in series, and hence the first LED/wavelength will have the longest optical path length while the last LED/wavelength will have the shortest; or

(2) “Equal-path” type, in which all LEDs/wavelengths have equal optical path length at the output.

Below is a step-by-step guide on how to construct a multi-wavelength collimated LED source:

(I) – “Straight-through” Type

Step-1: Select your desired collimated LED sources (up to 8 or more LED’s) based on wavelengths and output powers, according to the specific requirements for your application. Currently, only 22mm-diameter collimated LEDs can be DIRECTLY combined using Mightex multi-wavelength beam combiners, while 11mm-diameter collimated LEDs can be attached to a beam combiner using an adapter and then combined.

Low-power collimated LED’s (e.g.5W or below) have a Type-A package, while high-power collimated LED’s (e.g. 7W or above) have a Type-B package (with a cooling fan), as shown below.

Step-2: Rank the selected collimated LED’s by their wavelengths (from long to short). For example, a customer may choose the following four (4) LED’s for his specific application:

1.       LED#1, 740nm, 1W, Type-A;
2.       LED#2, 590nm, 10W, Type-B;
3.       LED#3, 530nm, 15W, Type-B; and
4.       LED#4, 470nm, 5W, Type-A.

Step-3: Combine LED#1 and LED#2 (i.e. the two LED’s with the longest wavelengths), by selecting the appropriate beam combiner. In this specific example, LCS-BC25-0660 (or LCS-BC25-0685) can be used to combine LED#1 (740nm) and LED#2 (590nm). Result as shown below.

Step-4: Add LED#3 to the sub-assembly, by selecting a 2nd beam combiner. A connecting plate (P/N: ACC-BC25-CP-01/02/03) is used to hold the two beam combiners together. In the specific case discussed here, LED#3 (530nm) can be added to the sub-assembly using a beam combiner LCS-BC25-0560. Result as shown below.

Step-5: Add LED#4 to the sub-assembly, by selecting a 3^rd beam combiner. A 2^nd connecting plate (P/N: ACC-BC25-CP-01) is used to attach the beam combiner (along with LED#4) to the sub-assembly. In the specific case discussed here, LED#4 (470nm) can be added to the sub-assembly using a beam combiner LCS-BC25-0505. Result as shown below.

Now, all four (4) LED’s have been successfully combined to form a combined collimated output beam. The following step is OPTIONAL, and it only applies if one would like to (a) further connect the multi-wavelength collimated LED to a microscope; or (b) further couple the combined LED beam into a lightguide.

Step-6 (optional):
(a) The multi-wavelength collimated LED can be attached to a microscope using a microscope adapter.  Result as shown below.

Or

(b) A lightguide adaptor can be added to couple the combined collimated LED beam into a lightguide.

Process complete.

(II) – “Equal-Path” Type
Step-1: Select your desired collimated LED sources (up to 8 or more LED’s) based on wavelengths and output powers, according to the specific requirements for your application. Currently, only 22mm-diameter collimated LEDs can be DIRECTLY combined using Mightex multi-wavelength beam combiners, while 11mm-diameter collimated LEDs can be attached to a beam combiner using an adapter and then combined.

Low-power collimated LED’s (e.g. 5W or below) have a Type-A package, while high-power collimated LED’s (e.g. 7W or above) have a Type-B package (with a cooling fan), as shown below.

Step-2: Rank the selected collimated LED’s by their wavelengths (from long to short). For example, a customer may choose the following four (4) LED’s for his specific application:

1.LED#1, 740nm, 1W, Type-A;
2.LED#2, 590nm, 10W, Type-B;
3.LED#3, 530nm, 15W, Type-B; and
4.LED#4, 470nm, 5W, Type-A.

Now, one may put LED#1 and #2 into one group (“Group-1”), and LED#3 and #4 into the other group (“Group-2”).

Step-3: Combine Group-1 (i.e. LED#1 and LED#2, the two LED’s with the longest wavelengths), by selecting the appropriate beam combiner. In this specific example, LCS-BC25-0660 (or LCS-BC25-0685) can be used to combine LED#1 (740nm) and LED#2 (590nm). Result as shown below:

Similarly, Combine Group-2 (i.e. LED#3 and LED#3, the two LED’s with the shortest wavelengths), by selecting the appropriate beam combiner.. In this specific example, LCS-BC25-0515 (or LCS-BC25-0495) can be used to combine LED#3 (530nm) and LED#4 (470nm).

Step-4. Choose a 3rd beam combiner. (e.g. LCS-BC25-0550, and combine Group-1 and Group-2 assemblies into one large assembly, as below:

Now, all four (4) LED’s have been successfully combined together to form a combined collimated output beam. The following step is OPTIONAL, and it only applies if one would like to further connect the multi-wavelength collimated LED to a microscope.

Step-5 (optional): The multi-wavelength collimated LED can be attached to a microscope using a microscope adapter.

Process complete.

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