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Kinematic Mirror Mounts with Piezoelectric Adjusters


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Kinematic Mirror Mounts with Piezoelectric Adjusters

Features

  • Three-Axis Mirror Mounts with Manual and Piezo Adjusters in Series
  • For Ø7.0 mm or Ø1" (Ø25 mm) Mirrors
  • SMC or BNC Connectors for Piezo Control Voltage
  • Ø7.0 mm Mirror Mount is Ideal for Laser Cavities
  • Ø1" Mirror Mount is 30 mm Cage Compatible and Available with Bundled Controller

The three-axis mirror mounts sold on this page contain manual and piezo adjusters in series, enabling coarse and fine adjustment of the tip, tilt, and translation of a mounted mirror. We manufacture a Ø7.0 mm mirror mount whose compact size is ideal for use in laser cavities, as well as a Ø1" (Ø25 mm) mirror mount with through holes for integration into a 30 mm cage assembly. The bore in the Ø1" mount is available with an optional internal SM1 (1.035"-40) thread, which allows a mirror to be mounted with SM1RR Retaining Rings as opposed to a setscrew. We also offer the Ø1" mirror mounts in bundles with the MDT693B Three-Channel Piezo Controller, which provides electronic control for all three axes.

For applications requiring an exceptional level of thermal stability, Thorlabs manufactures the Polaris™ Kinematic Mirror Mount with Piezoelectric Adjusters.

ASM003 Kinematic Mirror Mount

SMC Male

SMC Male
Input Voltage: 0 - 75 V

KC1(-T)-PZ Kinematic Mirror Mount

BNC Male

BNC Male
Input Voltage: 0 - 150 V

 

MDT693B Three-Channel Piezo Controller

Piezo Output

BNC Female

BNC Female

Output Voltage: 0 - 150 V
Output Impedance (Max): 150 Ω, 1.0 nF

External Voltage Control

BNC Female

BNC Female

Input Voltage: 0 - 10 V
Input Impedance: 10 kΩ

External Computer Control

Type B USB Female

DB9 Female

Item #MDT693B
Output Specifications
Number of Channels3
ConnectorsBNC
(One BNC-to-SMC Adapter per Channel Included)
Output Voltage0 - 75 V, 0 - 100 V, or 0 - 150 V
(Selected by Switch on Rear)
Output Voltage Resolution
When Using Knobs
1.1 mV (for 75 V Output Voltage Setting)
1.5 mV (for 100 V Output Voltage Setting)
2.2 mV (for 150 V Output Voltage Setting)
Output Current (Max)60 mA
Output Noisea1.5 mV (RMS)
~9.9 mV (Peak-to-Peak)
Output Impedance (Max)150 Ω, 1.0 nF
Load Impedanceb (Min)2.5 kΩ
Bandwidth (-3 dB)9 kHz (No Load, Small Signal)
8.5 kHz (No Load, 150 Vpp)c
200 Hz (1.4 µF Piezo, 150 Vpp)c
Bandwidth Stability (-3 dB)<0.01% Over 5 Hours
External Control through BNC
Input Voltage0 - 10 V
Input Impedance10 kΩ
Input Gain7.5 V/V ± 5% (for 75 V Output Voltage Setting)
10 V/V ± 5% (for 100 V Output Voltage Setting)
15 V/V ± 5% (for 150 V Output Voltage Setting)
Output Voltage Resolution
When Using BNC
Limited by Noise of External Voltage Source
Scan Trim Gain Adjustment80% to 120% of Sum of Master Scan External Voltage and
Offset from Rotary Adjustment Knob
External Control through Command Line
Physical InterfaceFemale Type B USB 2.0 Connector
Digital-to-Analog Resolution16-Bit, 2.75 mV
Analog-to-Digital Resolution16-Bit, 3.0 mV
Physical Specifications
Display Type7-Segment LED with Four Digits
Display Resolution0.1 V
Enclosure Size12.18" × 4.15" × 8.55"
(309.4 mm × 105.5 mm × 217.1 mm)
Weight3.02 kg (6.65 lbs)
Operating Temperature10 to 40 °C
Power Specifications
Input Voltage100 - 240 VAC
Input Frequency50 - 60 Hz
Input Power (Max)60 VA
Fuse TypeIEC60127-2/3 (250 VA, Slow Blow, Type "T")
Fuse Dimensions5 mm x 20 mm
Fuse Rating600 mA
  • Tested without an external load connected (1 nF output impedance only). Adding a capacitive load, such as a piezo, will decrease the noise because the capacitance will create a low-pass filter with the output resistance.
  • The smallest allowable terminating resistance. Applying lower impedances will cause the short-circuit protection to limit the output voltage. Continued use in this mode will cause circuit degradation and eventual circuit failure.
  • Assume a ramp function is used. The bandwidth depends upon the load and requires a calculation for a more representative number. See Chapter 6 of the manual for details.

Piezo Driver Bandwidth Tutorial

Knowing the rate at which a piezo is capable of changing lengths is essential in many high-speed applications. The bandwidth of a piezo controller and stack can be estimated if the following is known:

  1. The maximum amount of current the controllers can produce. This is 0.5 A for our BPC Series Piezo Controllers, which is the driver used in the examples below.
  2. The load capacitance of the piezo. The higher the capacitance, the slower the system.
  3. The desired signal amplitude (V), which determines the length that the piezo extends.
  4. The absolute maximum bandwidth of the driver, which is independent of the load being driven.

To drive the output capacitor, current is needed to charge it and to discharge it. The change in charge, dV/dt, is called the slew rate. The larger the capacitance, the more current needed:

Piezo Equation 1

So, for example, for a 100 µm stack, having a capacitance of 20 µF, being driven by a BPC Series piezo controller with a maximum current of 0.5 A, the slew rate is given by

Piezo Equation 2

Hence, for an instantaneous voltage change from 0 V to 75 V, it would take 3 ms for the output voltage to reach 75 V.

Note: For these calculations, it is assumed that the absolute maximum bandwidth of the driver is much higher than the bandwidths calculated, and thus, driver bandwidth is not a limiting factor. Also please note that these calculations only apply for open-loop systems. In closed-loop mode, the slow response of the feedback loop puts another limit on the bandwidth.

Sinusoidal Signal

The bandwidth of the system usually refers to the system's response to a sinusoidal signal of a given amplitude. For a piezo element driven by a sinusoidal signal of peak amplitude A, peak-to-peak voltage Vpp, and frequency f, we have:

Piezo Equation 3

A diagram of voltage as a function of time is shown to the right. The maximum slew rate, or voltage change, is reached at t = 2nπ, (n=0, 1, 2,...) at point a in the diagram to the right:

Piezo Equation 4

From the first equation, above:

Piezo Equation 5

Thus,
Piezo Equation 6

For the example above, the maximum full-range (75 V) bandwidth would be

Piezo Equation 7.

For a smaller piezo stack with 10 times lower capacitance, the results would be 10 times better, or about 1060 Hz. Or, if the peak-to-peak signal is reduced to 7.5 V (10% max amplitude) with the 100 µm stack, again, the result would be 10 times better at about 1060 Hz.

Triangle Wave Signal

For a piezo actuator driven by a triangle wave of max voltage Vpeak and minimum voltage of 0, the slew rate is equal to the slope:

Piezo Equation 8.

Or, since f = 1/T:

Equation 9

Square Wave Signal

For a piezo actuator driven by a square wave of maximum voltage Vpeak and minimum voltage 0, the slew rate limits the minimum rise and fall times. In this case, the slew rate is equal to the slope while the signal is rising or falling. If tr is the minimum rise time, then

Equation 11

or

Equation 12.

 

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Posted Comments:
Poster: tpschwab
Posted Date: 2013-06-10 17:00:54.437
To Thorlabs, I have a few questions regarding the performance of the PZ631 Controller and KC1-PZ Piezoelectric Kinematic Mount: 1) What is the maximum allowable mass to be placed on the mount? 2) Once a desirable position, for the stage, is found, is it possible to return to this position by setting it as the default orientation?
Poster: cdaly
Posted Date: 2013-06-12 16:47:00.0
Response from Chris at Thorlabs: Thank you for using our feedback tool. We do not really have a well defined limit for the load spec of this mount, but we anticipate this can handle at most 1-2 pounds, but this will need to be kept at a very short moment from the mounting face of the KC1-PZ. As for the question on returning to a position, the device is simply driven by a voltage input. If you note the voltages which correspond to the desired position, you can simply apply these voltage again late to return, provided you have no moved the actuator screws.
Poster: jlow
Posted Date: 2012-09-26 16:17:00.0
Response from Jeremy at Thorlabs: Thank you very much for your feedback. We will look into the possibility of implementing your suggestion.
Poster:
Posted Date: 2012-09-22 00:12:33.0
Would be great to label the 3 adjusters, and the three cables.
Poster: bdada
Posted Date: 2012-03-15 13:36:00.0
Response from Buki at Thorlabs: Thank you for your feedback. KC1-PZ piezo mount has BNC connectors while the ASM003 has SMC connectors. Our MDT693 piezo controller has BNC connectors on the rear panel and also includes BNC to SMC adapters for the ASM003 mount. On the other hand, our BPC series piezo controller has an SMC male output, so you would need an adapter, T4292, BNC to SMC female, to be able to use it with the KC1-PZ. For reference, below is a link to our selection of compatible piezo controllers. http://www.thorlabs.com/Navigation.cfm?Guide_ID=2085 We will expand on the compatibility issue on our website. Thank you again for your feedback. Please contact TechSupport@thorlabs.com if you have any questions.
Poster:
Posted Date: 2012-03-07 19:08:07.0
There is mention of compatibility with T-cube piezo control, but little guidance on what makes it compatible.
Poster: tor
Posted Date: 2011-01-06 23:06:33.0
Response from Tor at Thorlabs to sema: I apologize for the inconvenience. I will send you an updated drawing; we will be including this drawing on the web shortly.
Poster: sema
Posted Date: 2011-01-06 14:26:18.0
Dear Inge, please define "within the next couple of weeks". We just bought a KC1-PZ/M, and we can neither find the cable configuration. The CAD drawings (in the package and here on the web) are still rev. E from 96.
Poster: Greg
Posted Date: 2010-04-16 14:51:39.0
A response from Greg at Thorlabs to jlarchibald: Thank you for pointing this out! I have corrected the web presentation for it.
Poster: Adam
Posted Date: 2010-04-16 14:42:01.0
A response from Adam at Thorlabs to jlarchibald: You are correct, the adjusters are 1/4-80 threaded. We will correct the typo that is on the website.
Poster: jlarchibald
Posted Date: 2010-04-16 14:36:14.0
On this webpage: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=231 theres a part that claims it has 1/4"-20 Adjusters. Im pretty sure theyre 1/4"-80 Adjusters. Its listed correctly in other places. Best, James
Poster: inge
Posted Date: 2008-08-12 14:54:08.0
That is a very good point. We will change the drawings within the next couple of weeks.
Poster: inge
Posted Date: 2008-08-12 14:53:57.0
That is a very good point. We will change the drawings within the next couple of weeks.
Poster: ghegenbart
Posted Date: 2008-08-11 06:44:45.0
Unfortunately the ESDs of the KC1-PZ(/M) and KC1-T-PZ(/M) do not contain any information about which cable belongs to which actuator.
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Ø7.0 mm Kinematic Mirror Mount with Piezo Adjusters
Protected Silver at Near-Normal Incident Angle
Click to Enlarge
The shaded region in the graph above denotes the range over which we recommend using our protected silver coating. Click here to download the raw data used to make this plot, as well as data at a 45° AOI.
ASM003 Adjuster Screw Diagram
Click for Details
Schematic of ASM003 Mirror Mount
  • Compatible with Ø7.0 mm Mirrors up to 2.5 mm (0.10") Thick
  • Ø6.0 mm Clear Aperture Through Entire Mount
  • Manual and Piezo Adjusters in Series
    • Manual: ±2° (±35 mrad) Angular Range; ±0.5 mm Linear Travel
    • Piezo: ±1 arcmin (±0.3 mrad) Angular Range; ±3.5 µm Linear Travel
  • Minimum Piezo Angular Adjustment: <1 arcsec (<5 µrad)
  • SMC Connectors Accept Control Voltages up to 75 V
  • Up to 2 kHz Operating Rate
  • Mount Fabricated from Stainless Steel
  • Includes Ø7.0 mm Silver Mirror and Mounting Plate Designed for Our Flexure Stages

This piezo-driven mirror mount provides an angular resolution of better than 1 arcsec (<5 µrad). Each of the three adjustable axes consists of a manual and piezo adjuster in series. Ø7.0 mm optics up to 2.5 mm (0.10") thick are accommodated, and the Ø6.0 mm bore through the entire mount permits use with transmissive optics. A Ø7.0 mm protected silver mirror (Item # PF03-03-P01) is included; the reflectance of protected silver is shown to the right.

The fine-pitch manual adjusters, actuated with a flat head screwdriver (see diagram at right), provide 250 µm/rev and a full translation range of 1 mm (0.04"), for a full angular range of 4° (70 mrad). The piezoelectric elements embedded in the mount allow an additional 7 µm of translation, thereby providing an additional angular range of 2 arcmin (0.6 mrad). Each piezo adjuster is connected to a built-in 200 mm cable with a male SMC connector, and the maximum control voltage is 75 V. When driven by one of our piezoelectric drivers, the piezo elements can operate at up to 2 kHz, making this mirror mount an ideal laser cavity mirror holder when rapid scanning of a resonator cavity length is required.

The bottom of the ASM003 includes a mounting plate with an alignment key for mechanical compatibility with our family of flexure stages. The mounting plate is secured in place by two M2.5 cap screws that can be removed for custom mounting needs.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
ASM003 Support Documentation
ASM003 Ø7.0 mm Mirror Mount, 3 Piezo Adjusters, Protected Silver Mirror Included
$1,449.58
Today
Ø1" (Ø25 mm) Kinematic Mirror Mounts with Piezo Adjusters
Cable and Actuator Layout
Click to Enlarge
Cable Diagram
  • Compatible with Ø1" (Ø25 mm) Mirrors
  • Available with Smooth or SM1-Threaded (1.035"-40) Central Bore
  • Through Holes for Integration with a 30 mm Cage System
  • Manual and Piezo Adjusters in Series
    • Manual: ±5° (±87 mrad) Angular Range; ±3 mm Linear Travel
    • Piezo: ±15 arcsec (±73 µrad) Angular Range; ±4 µm Linear Travel
  • Minimum Piezo Angular Adjustment: 0.06 arcsec (0.3 µrad)
  • BNC Connectors Accept Control Voltages up to 150 V
  • Mount Fabricated from Black Anodized Aluminum
  • Available with Bundled Controller (See Below)

These mirror mounts, based upon our KC1 mirror mounts, provide piezo-driven fine adjustments with a minimum angular resolution of 0.06 arcsec (0.3 µrad). Each of the three adjustable axes consists of a manual and piezo adjuster (Item # AE0505D08F) in series. The smooth bore version [Item # KC1-PZ(/M)] secures the mirror with an 8-32 (M4) setscrew and accepts mirrors at least 0.12" (3 mm) thick, while the SM1-threaded version [Item # KC1-T-PZ(/M)] secures the mirror with two included SM1RR Retaining Rings and accepts mirrors up to 0.20" (5 mm) thick.

The 1/4"-80 manual adjusters provide 7 mrad/rev and a full translation range of 6 mm (0.24"), for a full angular range of 10° (174 mrad). The piezoelectric elements embedded in the mount allow an additional 8 µm of translation, thereby providing an additional angular range of 30 arcsec (146 µrad). Each piezo adjuster is connected to a built-in 3' (91.4 cm) cable with a male BNC connector, and the maximum control voltage is 150 V. The knob assignments are shown in the diagram to the right.

Although SM1-threaded optics and lens tubes can be attached to the KC1-T-PZ, we do not recommend it because increasing the distance between the optic and the pivot points of the mount will amplify the movement of the beam. These mounts are also sold bundled with the MDT693B Three-Channel Piezo Controller, providing all the components needed for open-loop control of the mount (see below for details).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
KC1-PZ Support Documentation
KC1-PZ Ø1" (Ø25 mm) Mirror Mount, 3 Piezo Adjusters, Smooth Bore
$604.60
Today
KC1-T-PZ Support Documentation
KC1-T-PZ Ø1" (Ø25 mm) Mirror Mount, 3 Piezo Adjusters, SM1 Threaded
$605.60
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
KC1-PZ/M Support Documentation
KC1-PZ/M Ø1" (Ø25 mm) Mirror Mount, 3 Piezo Adjusters, Smooth Bore, Metric
$604.60
Today
KC1-T-PZ/M Support Documentation
KC1-T-PZ/M Ø1" (Ø25 mm) Mirror Mount, 3 Piezo Adjusters, SM1 Threaded, Metric
$605.60
Today
Ø1" (Ø25 mm) Kinematic Mirror Mounts with Piezo Adjusters and Bundled Controller
3-Channel Piezo Controller
Click for Details
Front Panel of Controller
  • Includes One KC1-PZ(/M) or KC1-T-PZ(/M) Mirror Mount (Shown Above)
  • Bundled MDT693B Controller Includes:
    • Three Output Channels with BNC Connectors and Output Voltage up to 150 V
    • Controlled Directly by Front Panel or Remotely Through BNC or Command Line
    • Ability to Drive All Channels with One Signal

These bundles provide all the components and cables needed for open-loop control of a three-axis kinematic mirror mount with piezo adjusters. They consist of our MDT693B Three-Channel Piezo Controller, a KC1-PZ(/M) or KC1-T-PZ(/M) mirror mount (see above for details on the mirror mount options), and a region-specific power cord selected at the time of the order.

The MDT693B piezo controller features three precise, low-noise, independently controllable output channels and is capable of supporting the piezo mirror mounts' maximum control voltage of 150 V. The control voltage can be modified using rotary knobs on the front panel and by providing an external signal through BNC or USB 2.0. The driver also includes a Master Scan mode that allows all three axes to be controlled by one signal. For more information, please see the full MDT693B presentation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
PZ630B Support Documentation
PZ630B KC1-PZ Smooth Bore Mirror Mount and MDT693B Piezo Controller
$2,495.00
Lead Time
PZ631B Support Documentation
PZ631B KC1-T-PZ SM1-Threaded Mirror Mount and MDT693B Piezo Controller
$2,495.00
Lead Time
+1 Qty Docs Part Number - Metric Price Available / Ships
PZ630B/M Support Documentation
PZ630B/M KC1-PZ/M Smooth Bore Mirror Mount and MDT693B Piezo Controller
$2,495.00
Lead Time
PZ631B/M Support Documentation
PZ631B/M KC1-T-PZ/M SM1-Threaded Mirror Mount and MDT693B Piezo Controller
$2,495.00
Lead Time
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Last Edited: Sep 20, 2013 Author: Dan Daranciang