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 LSR-3000 Series

Transmissive Laser Speckle Reducer

The LSR Series allows you to significantly reduce the speckle noise of laser systems. Local interferences are removed by dynamically diffusing the coherent beam. The LSR-3000 is designed for practical use with your optics table and integrates fully certified drive electronics powered through a single micro-USB connector.

Optotune's laser speckle reducer is the ideal choice for application in:
● Laser projection displays
● Head-up displays
● Beam homogenizer
● Metrology
● Microscopy
● Interferometry
● Lithography
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LSR-3005

Clear aperture: 5mm, Outer diameter: 41mm

  •  Clear aperture  5mm
     Outer diameter  41mm
     Thickness  8.8mm
     Weight  24.43g
     Oscillation frequency  ~300Hz
     Oscillation amplitude (peak to peak)  ~300μm

     

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LSR-3010

Clear aperture: 10mm, Outer diameter: 48mm

  •  Clear aperture  10mm
     Outer diameter  48mm
     Thickness  8.8mm
     Weight  32.84g
     Oscillation frequency  ~180Hz
     Oscillation amplitude (peak to peak)  ~400μm

     

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LSR-5-17(OEM Series)

Clear aperture: 5mm, External dimensions (WxHxD): 17x17x3.8mm

  •  Clear aperture  5mm
     External dimensions (WxHxD)  17x17x3.8mm
     Weight (LSR only / including electronics)  1.44 / 2.50
     Electrode capacitance  75pF
     Oscillation frequency  ~300Hz
     Oscillation amplitude (peak to peak)  ~300μm

     

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LSR-10-22(OEM Series)

Clear aperture: 10mm, External dimensions (WxHxD): 22x22x3.8mm

  •  Clear aperture  10mm
     External dimensions (WxHxD)  22x22x3.8mm
     Weight (LSR only / including electronics)  2.18 / 3.24
     Electrode capacitance  120pF
     Oscillation frequency  ~180Hz
     Oscillation amplitude (peak to peak)  ~400μm

     

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LSR-3000 series

 Power supply (micro-USB interface)
 5VDC
 Power consumption  310mW
 Diffusion angle (FWHM)  1°/10°/20°
 Damage threshold2  >3 W/cm2
 Storage temperature  [-40,+85]°C
 Operating temperature  [-30,+85]°C

1 100-230VAC to 5VDC micro-USB power supply available; Optimized electronics require about 40mW
2 The standard LSR comes with polycarbonate diffusers. On request, custom diffusers made of proprietary polymers are available, which offer a higher transmission range and a damage threshold of 300 W/cm2. Furthermore, it is possible to build LSRs with coated glass diffusers of similar size and weight.

Mechanical drawing of the LSR-3005 (unit: mm)



Mechanical drawing of the LSR-3005 (unit: mm)

Ordering information for standard products
The LSR-3000 can be delivered with two sizes of clear aperture, three different diffusing angles (circular) and two types of cover glasses. When ordering, please refer to these specifications as follows:

LSR-30CA-θ-AR


CA = Clear aperture (05 or 10 mm)
θ = Diffusion angle (1°, 10° or 20°)
AR= Antireflection coating (VIS or NIR)

Example: LSR-3005-20-VIS refers to a speckle reducer of 5 mm aperture with a diffusion angle of 20° and VIS coated cover glasses. A-O Modulators AOTF E-O Modulators Rotators & Isolators Photodetectors & PSD Laser

LSR-OEM series

 Power supply (micro-USB interface)1
 5VDC
 Power consumption (with std. electronics)1  310mW
 Diffusion angle (FWHM)  1°/10°/20°
 Damage threshold2  >3 or >300 W/cm2
 Storage temperature  [-40,+85]°C
 Operating temperature  [-30,+85]°C

1 100-230VAC to 5VDC micro-USB power supply available; Optimized electronics require about 40mW
2 The standard LSR comes with polycarbonate diffusers. On request, custom diffusers made of  proprietary polymers are available, which offer a higher transmission range and a damage threshold of 300 W/cm2. Furthermore, it is possible to build LSRs with coated glass diffusers of similar size and weight.


Mechanical drawing of the LSR-5-17-θ-AR-E including drive electronics (unit: mm)


Mechanical drawing of the LSR-10-22-θ-AR-E including drive electronics (unit: mm)

Ordering information for standard diffusion angles
The LSR-OEM is currently available with two aperture & frame sizes, three different diffusing angles (circular) and two types of cover glasses. When ordering, please refer to these specifications as follows:

LSR-A-S-θ-AR-E


A = Clear aperture in mm (5 or 10)
S = Frame size in mm (17 or 22)
θ = Diffusing angle (1°, 10° and 20° available as standard)
AR = Antireflection coating (VIS or NIR)
E = Indluding drive electronics (optional)

Example: LSR-5-17-1-VIS-E refers to a speckle reducer with a clear aperture of 5mm, a frame size of 17 mm, a diffusing angle of 1°, VIS coated cover glasses and ships with the drive electronics attached. LSR-10-22-NIR-20 refers to a speckle reducer with a clear aperture of 1mm, a frame size of 22 mm, a diffusing angle of 20°, NIR coated cover glasses and ships without any electronics.



Ordering information for standard diffusion angles

CCD images of a laser spot without and with LSR-3005 / LSR-OEM on.

The following two figures show the transmission spectrum of the LSR-3000 / LSR-OEM Series with standard polycarbonate diffusers and coated BK7 cover glasses. In addition to the dynamic diffuser, standard products ship with a 1° static diffuser to increase speckle reduction efficiency.

Transmission spectrum of the LSR-3000 / LSR-OEM series with VIS-coated cover glasses (0° angle of incidence)


Transmission spectrum of the LSR-3000 series with NIRcoated cover glasses (0° angle of incidence)

Life time
The LSR has passed the following accelerated aging tests. The tests were performed on 5-10 samples each and are considered as passed if the oscillation amplitude of all samples did not change more than 5%.

Test

LSR-3005

 A1 – High temperature (operating):
 ● Test temperature: 85°C ± 5°C
 ● Test duration: 48 hours
 ● Reference: JESD22-A108-B, JESD47-A and JESD74
 Passed
 A2 – Low temperature (operating):
 ● Test temperature: -30°C ± 5°C
 ● Test duration: 48 hours
 ● Reference: JESD22-A108-B, JESD47-A
 Passed
 A3.1 – Temperature cycling (non-operating):
 ● Low temperature: –40°C, high temperature: +85°C
 ● Transition time: < 3 minutes
 ● Test duration: 30 min for each under low and high temperature
 ● Number of cycles: 100 cycles
 ● Recovery time: 2 hours
 ● References: IEC 60068-2-1, IEC 60068-2-2 and IEC 60068-2-14
 Passed
 A3.2 – Damp heat cycling (non-operating):
 ● Low temperature: 25°C, high temperature: +55°C
 ● Test humidity: 90-100% relative humidity
 ● Test duration: 12 hours dwell
 ● Temperature change rate: Less than 1°C per minute
 ● Number of cycles: 18 cycles
 ● Recovery time: No recovery time
 ● References: IEC 60068-2-30 Db Variant 1
 Passed
 A4 – High temperature (non-operating):
 ● Test temperature: Static 85 +/- 2 °C
 ● Test humidity: Less than 20 g/m3 of water vapor (corresponding to approximately 50% relative humidity at
     35 °C)
 ● Test duration: 168 hours
 ● Temperature change rate: Less than 1°C per minute
 ● Reference: IEC 60068-2-2 Bb
 Passed
 Operating lifetime test:
 ● Test temperature: 22 +/- 2 °C
 ● Test duration: 6000 hours
 ● Driving frequency: 300 Hz
 Passed
 Shock test:
 ● 400g for 1ms duration
 ● 5 pulses in each direction (30 pulses in total)
Passed

  Environmental and accelerated aging tests performed on the LSR Series

Diffusers
In principle, any type of diffuser can be used as long as size and weight are similar to the standard polycarbonate diffuser. Optotune has several types of polycarbonate diffusers in stock (circular: 0.5°, 2°, 3°, 5°, 30°, 40°, elliptical: on demand e.g. 40°x0.1°) and can also produce diffusers of a proprietary polymer material, which offers a higher transmission range (see Figure 6) and a damage threshold of 300 W/cm2. Furthermore, it is possible to use specialty coated glass diffusers if they are light enough. If necessary, it is also possible to remove the membrane from the optical path.
The following table summarizes these options:

Diffuser type Polycarbonate
(standard)
Optotune proprietary
polymer
Glass diffusers
(typical)
 Thickness
250 um 150 – 300 um As thin as possible
 Density 1.2 g/cm3 1.2 g/cm3 2.2 g/cm3
 Weight
 5 mm aperture3
 10mm aperture

8.5 mg
28.5 mg

5.1 – 10.1 mg
17.1 – 34.2 mg

up to 20 mg
up to 70 mg
 Transmission range 350 – 1550 nm 240 – 2500 nm 170 – 12000 nm
(depending on material)
 Resonant frequency
 5 mm aperture3
 10mm aperture

300 Hz
180 Hz

275 – 385 Hz
165 – 230 Hz
 Damage threshold > 3W/cm2 > 300 W/cm2 1 kW/cm2
(depending on material)

Please note that diffusers cannot be exchanged after the LSR has been produced. Also, when using customized diffusers it might be necessary to select an appropriate cover glass to match the transmission range.

3 Note: The 5mm and 10mm aperture LSR is usually equipped with 6mm and 11mm diameter diffuser, respectively.

 

 
Comparison of standard polycarbonate diffusers and Optotune’s proprietary diffuser material.

Cover glasses
Cover glasses can be customized with respect to material and AR-coating. The standard cover glasses are VIS or NIR coated BK7. If the LSR is to be integrated into a clean environment, then the cover glasses can be omitted.

Frequency
The oscillation frequency is set to the measured resonant frequency of the LSR during production. With the current standard electronics it is not possible to change that frequency after production. However, Optotune can provide customized electronics to control both voltage and frequency of the electro-active polymer.