Electrically Tunable Lenses

  • Update:Sep 21, 2017
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Our focus tunable lenses was inspired by the working principle of the human eye. Within milliseconds, the focal length of our electrical lenses is tuned by applying a control current. The unique principle enables the design of faster and more compact

Product Introduction

Within milliseconds, the focal length of our electrical lenses is tuned by applying a control current. The unique principle enables the design of faster and more compact optical systems without complex mechanics. We are a leading supplier of focus tunable lenses for diverse applications. Whether electrically or mechanically actuated, the advantages of tunable lenses over traditional optics are striking. Our lenses can be tailored to your specific demands in terms of size, tuning range, transmission range or speed. Tell us your requirements and we will be happy to assess the feasibility.

Our electrical lenses are current controlled. There are several options for current drivers ranging from regular lab power supplies to tiny VCM driver ICs.  We offers a high-precision USB driver with a resolution of 0.1mA, which includes read-out of integrated temperature sensors over I2C.

The following table summarizes the main specifications of our most popular focus tunable lenses:

 

 STOT-EL-10-30
Series

STOT-EL-10-30-C
Series

STOT-STOT-EL-10-42-OF

STOT-STOT-EL-16-40-TC
Series

STOT-ML-20-35
Series

Specs

Product description

Fast electrically tunable lens

Fast electrically tunable lens

Fast electrically tunable lens

Fast electrically tunable lens

Manually
tunable lens

Size (ØxH)

 30mm x 9.7mm

 30mm x 20.7mm

42mm x 36mm

 40mm x 11.9mm

 35mm x 8mm

Clear aperture

 10mm

 10mm

10mm

 16mm

 20mm

Lens Type

 Plano convex

 Plano convex
(offset lens optional)

Plano convex + plano concave offset lens

Plano convex to plano concave

 Plano convex to plano concave

Focal length range

 From +20 to +140mm

From -600 to +170 mm 

From -500 to +500 mm

 From -500 to +333 mm

 From -40 to +40mm

Refractive Index

 1.300 or 1.559

 1.300

1.300

  1.300

   1.300 or 1.559

Fast Electrically Tunable Lens STOT-EL-10-30-TC

Design faster and more compact optical systems without complex mechanics using the electrically focus tunable lens STOT-EL-10-30-TC. By applying a current, the focal length of the 10 mm aperture lens can be tuned to a specific value in milliseconds. Thanks to an integrated temperature sensor and characterization data, the lens can be driven to precise focal powers using our lens driver 4. The STOT-EL-10-30-TC is available with two broadband coating options, VIS for 400-700nm and NIR for 700-1100nm.

STOT-EL-10-30-TC

The following table summarizes the main specifications of the compact STOT-EL-10-30-TC:

Standard products

Tuning range

Refractive index

Cover glass coating

Wavefront error* 

STOT-EL-10-30-TC-VIS-12D

+120 to +50 mm
+8.3 to +20 dpt

1.30

400 - 700nm

<0.25 / <0.60 λ

STOT-EL-10-30-TC-NIR-12D

+120 to +50 mm
+8.3 to +20 dpt

1.30

700 - 1100nm

<0.25 / <0.60 λ

* Wavefront error provided in λ RMS @525nm with optical axis vertical / horizontal

Applications

Fast Electrically Tunable Lens STOT-EL-10-30-C

Design faster and more compact optical systems without complex mechanics using the electrically focus tunable lens STOT-EL-10-30-C. By applying a current of 0 to 300mA, the focal length of the 10 mm aperture lens can be tuned to a specific value within milliseconds. The STOT-EL-10-30-C also features threads on either side for easy mounting as well as the possibility to replace the cover glass with a fixed focus offset lens, allowing for free adjustment of the focal length range according to the requirements of your application.

STOT-EL-10-30-C
(OEM version)

STOT-EL-10-30-Ci
(industrial version)

The STOT-EL-10-30-C has two main optical configurations:

1.  The basic configuration has planar cover glasses and a focal tuning range of 200mm down to 100mm, making this the best choice for macro imaging.

2.  The "MV" configuration is optimized for the machine vision market. It contains a negative offset lens so that the overall focal tuning range goes from slightly negative down to 286mm, making this the ideal choice for combinations with infinity corrected fixed-focus lenses.

The following table summarizes the main specifications of the STOT-EL-10-30-C series:

Standard products*

Tuning range with Lens Driver 4
(0 - 250mA)

Integrated offset lens

Cover glass coating

Wavefront error**

STOT-EL-10-30-C-VIS-LD

200 to 100 mm
5 to 10 dpt

No

400 - 700nm

<0.15 / <0.25 λ

STOT-EL-10-30-C-NIR-LD

200 to 100 mm
5 to 10 dpt

No

700 - 1100nm

<0.15 / <0.25 λ

STOT-EL-10-30-C-VIS-LD-MV

-667 to +286mm
-1.5 to +3.5 dpt

Yes (-150mm)

400 - 700nm

<0.15 / <0.25 λ

STOT-EL-10-30-C-NIR-LD-MV

-667 to +286 mm
-1.5 to +3.5 dpt

Yes (-150mm)

700 - 1100nm

<0.15 / <0.25 λ

* All the above models are available with a 6-pin FPC connector (OEM version) or with a 6-pin Hirose connector (industrial version)
** Wavefront error provided in λ RMS @525nm with optical axis vertical / horizontal

Since 2014 all lenses offer "Focal Power Mode", which makes use of calibration data saved directly on the lens, allowing for open loop control including temperature compensation at a repeatability of typically +/-0.1 diopters.

Applications

Fast Electrically Tunable Lens STOT-EL-10-42-OF

The electrically focus-tunable lens STOT-EL-10-42-OF is dedicated to 3D laser processing applications and sets the highest standards in terms of spot quality, speed and repeatability. With a focus tuning range of -2.0 to +2.0 diopters the spot can be controlled over a large range along the z-axis (working distance change of up to 180mm). Our proprietary built-in optical feedback mechanism allows for a long term repeatability of <0.02 diopters. The STOT-EL-10-42-OF is optimized for the use at 1064nm and 532nm.

STOT-EL-10-42-OF

Applications

Fast Electrically Tunable Lens STOT-EL-16-40-TC

With a clear aperture of 16 mm we presents the world’s largest electrically focus tunable lens. Its design has been optimized in many ways:

The STOT-EL-16-40-TC is available in its compact form for OEM integration but also with multiple thread adapters and a robust Hirose connector for industrial use, where the tunable lens can be easily combined with off-the-shelf imaging lenses.

STOT-EL-16-40-TC

(OEM version)

STOT-EL-16-40-TC

with thread adapters (industrial version)

The STOT-EL-10-30-C has two main optical configurations:

  1. The basic configuration has planar cover glasses and a focal tuning range of 200mm down to 100mm, making this the best choice for macro imaging.
  2. The "MV" configuration is optimized for the machine vision market. It contains a negative offset lens so that the overall focal tuning range goes from slightly negative down to 286mm, making this the ideal choice for combinations with infinity corrected fixed-focus lenses.

The following table summarizes the main specifications of the STOT-EL-16-40-TC series:

Standard products*

Tuning
range

Wavefront error**

Top
thread

Bottom
thread

STOT-EL-16-40-TC-VIS-5D

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

None

None

STOT-EL-16-40-TC-VIS-20D

-100 to 100 mm
-10 to 10 dpt

<0.50 / <2.5 λ

None

None

STOT-EL-16-40-TC-VIS-5D-M25.5

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

M25.5x0.5
male

M40.5x0.5
female

STOT-EL-16-40-TC-VIS-5D-M27

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

M27x0.5
male

M40.5x0.5
female

STOT-EL-16-40-TC-VIS-5D-M30.5

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

M30.5x0.5
male

M40.5x0.5
female

STOT-EL-16-40-TC-VIS-5D-C

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

C-mount
male

C-mount
female

STOT-EL-16-40-TC-VIS-5D-M42

-500 to 333 mm
-2 to 3 dpt

<0.25 / <0.5 λ

M42x1
male

M42x1
female

* All models are available with a 6-pin FPC connector. The models with thread adapters come with a 6-pin Hirose connector
** Wavefront error provided in λ RMS @525nm with optical axis vertical / horizontal

Applications

STOT Manually Tunable Lens

The STOT-ML-20-35 adapts itself to your specific requirements. By manually rotating an adjustment ring, the lens changes its shape from convex to flat or to concave. This unique feature allows you to choose and finely tune the focal length of the lens within -40 to +40 mm range.

Applications:

Electrical Lens Driver 4

The Lens Driver 4 offers a simple yet precise way to control our electrically tunable lenses, in particular the EL-6-18 and STOT-EL-10-30 series. Communication with the driver follows an open simple serial protocol, which can be implemented in any programming language on Windows or Linux (C#, Labview and Python source code available). The driver comes with free software and can be used as a standalone solution or integrated into OEM designs. As a compact USB-powered current source, it also serves for driving LEDs or laser diodes.

Lens Driver 4 (OEM version)

 Lens Driver 4i (industrial version)

Main features:

This constant current source is suitable for:

Industrial Lens Controller TR-CL180 by Gardasoft

Designed for industrial use, this Lens Controller by Gardasoft is the ideal solution for machine vision customers. GigE Vision, RS232 and analog interfaces as well as numerous SDKs allow for easy integration. The trigger input and fast response time of the controller make it also interesting for Z-stacking in microscopy and life science applications.

Main features:

EL-E-OF-A Lens Driver for STOT-EL-10-42-OF with Analog Interface (0-5V)

The EL-E-OF-A enables the control of the STOT-EL-10-42-OF lens module via an analog voltage signal. Several digital signals are available for status verification. The electronics essentially provides an analog-to-digital stage to read the control and set voltage signal, digital processing with an implemented PID-loop and current sources to drive the lens and the heater unit. The board is optimized for OEM-integration in laser marking systems and therefore comes without housing.

Main features:

SCAPS DSD Lens Driver for STOT-EL-10-42-OF with Digital Interface (XY2-100)

Optotune-DSD is an FPGA-based digital controller which is used for the control of the STOT-EL-10-42-OF lens module. The board is composed of two layers for which the top one is Digital Servo Interface (DSI-1-O16) and the bottom one is Digital Servo Controller (DSC-1). The board is particularly designed and optimized for OEM-integration in 3D laser marking systems.

Main features:

 

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