THORLABS SA201-EC User manual

SA201(-EC)

Spectrum Analyzer

Controller

Operating Manual

Spectrum Analyzer Controller

Table of Contents

Chapter 1 Warning Symbol Definitions ........................................... 1

Chapter 2 Safety................................................................................. 2

Chapter 3 Overview............................................................................ 3

3.1. Parts List.......................................................................3

3.2. Compatible Fabry-Perot Scanning Heads .......................4

Chapter 4 Description........................................................................ 5

4.1. Detector Gain Adjustment.............................................6

4.2. DC Offset Control ..........................................................6

4.3. Sweep Expansion Control ..............................................6

4.4. Waveform Control ........................................................6

4.5. Power Switch ................................................................6

4.6. Power On Indicator .......................................................6

4.7. Amplitude Control.........................................................7

4.8. Rise Time Control ..........................................................7

4.9. Trigger Output BNC.......................................................8

4.10. Output BNC...................................................................8

4.11. Ground Plug..................................................................9

4.12. AC Input Connector .......................................................9

4.13. PD Amplifier Input BNC .................................................9

4.14. PD Amplifier Output BNC.............................................10

4.15. Voltage Selector Switch...............................................10

Chapter 5 Operation.........................................................................11

5.1. PD Blanking Circuit......................................................11

5.2. Replacing the Fuse ......................................................12

5.2.1. Materials Needed.....................................................................12

5.2.2. Fuse Replacement...................................................................12

Spectrum Analyzer Controller

5.3. Selecting the Line Voltage ...........................................13

5.4. Cleaning .....................................................................13

Chapter 6 Recommended Setup..................................................... 14

6.1. Recommended Setup for SA200 Series Fabry-Perot

Interferometers (Except SA200-30C) ............................14

6.2. Recommended Setup for SA200-30C Fabry-Perot

Interferometer............................................................15

Chapter 7 Specifications ................................................................. 17

7.1. Output Characteristics.................................................17

7.2. Trigger Characteristics ................................................17

7.3. Photodiode Amplifier Characteristics ...........................18

7.4. Physical Features ........................................................19

7.5. Power Supply..............................................................19

Chapter 8 Regulatory.......................................................................20

Chapter 9 Declaration of Conformity .............................................21

Chapter 10 Thorlabs Worldwide Contacts....................................... 22

Spectrum Analyzer Controller Chapter 1: Warning Symbol Definitions

Rev H, November 30, 2021 Page 1

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol

Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

Spectrum Analyzer Controller Chapter 2: Safety

Page 2 6679-D02

Chapter 2 Safety

Precautions of a general nature should be gathered here. Wherever possible,

however, safety warnings, cautions, and notes should only appear immediately

before the instructions to which they apply (versus being listed in this section).

DANGER!

The Thorlabs Spectrum Analyzer Controller, SA201, must be powered off,

unplugged from the AC input source, and disconnected from any piezo

elements prior to replacing the fuse or removal of the cover. Failure to do so

may cause SERIOUS INJURY to the user, since high voltages exist within the

unit.

WARNING!

Complete the setup of the equipment before energizing the laser.

WARNING!

When the laser is energized, always use the proper eye protection relative to the

laser used in the setup. When an invisible laser source is used, use extra

caution during alignment.

Spectrum Analyzer Controller Chapter 3: Overview

Rev H, November 30, 2021 Page 3

Chapter 3 Overview

Thorlabs' Scanning Fabry-Perot (FP) Interferometers are spectrum analyzers that

are ideal for examining fine spectral characteristics of CW lasers. The controller

generates a voltage ramp, which is used to scan the separation between the two

cavity mirrors. The controller provides adjustment of the ramp voltage and scan

time, allowing the user to choose the scan range and speed. An offset control is

provided to allow the spectrum displayed on the oscilloscope to be shifted right or

left. Another convenient feature of the controller is a zoom capability that provides

a 1X, 2X, 5X, 10X, 20X, 50X and 100X increase in the spectral display resolution.

The output TTL level trigger allows the user to externally trigger an oscilloscope

on either the beginning or midpoint of the ramp waveform.

The SA201 also includes a high precision photodetector amplifier circuit used to

monitor the transmission of the cavity. The amplifier provides an adjustable

transimpedance gain of 10,000, 100,000, and 1,000,000 V/A when driving a high

impedance load, such as an oscilloscope. Using the output sync signal from the

controller, an oscilloscope can be used to display the spectrum of the input laser.

The detector circuitry incorporates a blanking circuit, which disables the

photodiode response during the falling edge of the saw tooth waveform.

3.1. Parts List

Below is a list of all components shipped with the SA201 Spectrum Analyzer

Controller.

•SA201 Spectrum Analyzer Controller

•Operating Manual

•120 VAC US Power Supply Line Cord (with the SA201) or 230 VAC

Power Supply Line Cord for Europe (with the SA201-EC)

•125 mA Fuse for use at 230 VAC operation (250 mA fuse installed in unit)

Spectrum Analyzer Controller Chapter 3: Overview

Page 4 6679-D02

3.2. Compatible Fabry-Perot Scanning Heads

This product has been designed to be used with one of our SA200, SA210, or

SA30 Series Scanning Fabry-Perot Interferometers. Below is a list of available

heads. Note this list is subject to change without notice. Please visit the website

for the most current information.

Previous generations of scanning Fabry-Perot interferometers are also compatible

with this product. These items are listed below.

Item #

Description

SA200-2B

290 - 335 nm;

520 - 545 nm

1.5 GHz FSR

SA200-3B

350 - 535 nm,

1.5 GHz FSR

SA200-5B

535 - 820 nm,

1.5 GHz FSR

SA200-8B

820 - 1275 nm,

1.5 GHz FSR

SA200-12B

1275 - 2000 nm,

1.5 GHz FSR

SA200-18C

1800 - 2500 nm,

1.5 GHz FSR

SA200-30C

3000 –4400 nm,

1.5 GHz FSR

Item #

Description

SA210-3B

350 - 535 nm,

10 GHz FSR

SA210-5B

535 - 820 nm,

10 GHz FSR

SA210-8B

820 - 1275 nm,

10 GHz FSR

SA210-12B

1275 - 2000 nm,

10 GHz FSR

SA210-18C

1800 - 2500 nm,

10 GHz FSR

SA30-52

488 –545 nm,

1.5 GHz FSR

Item #

Description

SA200-7A

780 - 930 nm,

1.5 GHz FSR

SA200-9A

900 - 1100 nm,

1.5 GHz FSR

SA200-14A

1450 - 1625 nm,

1.5 GHz FSR

SA200-18B

1800 - 2500 nm,

1.5 GHz FSR

SA200-30B

3000 –4400 nm,

1.5 GHz FSR

Item #

Description

SA210-5A

525 - 650 nm,

10 GHz FSR

SA210-7A

780 - 930 nm,

10 GHz FSR

SA210-9A

900 - 1100 nm,

10 GHz FSR

SA210-12A

1250 - 1400 nm,

10 GHz FSR

SA210-14A

1450 - 1625 nm,

10 GHz FSR

SA210-18B

1800 - 2500 nm,

10 GHz FSR

Spectrum Analyzer Controller Chapter 4: Description

Rev H, November 30, 2021 Page 5

Chapter 4 Description

Figure 1 SA201 Front Panel Controls

Rise Time Control

Power On Indicator

Amplitude Control

Sweep Expansion Control

Detector Gain Adjustment

Waveform Control

DC Offset Control

Output BNC

Trigger Output BNV

Power Switch

Spectrum Analyzer Controller Chapter 4: Description

Page 6 6679-D02

4.1. Detector Gain Adjustment

The SA201 includes a built in photodiode amplifier circuit. This amplifier is

designed specifically to operate with the detector provided with the SA200 series

Fabry-Perot Interferometer, allowing the user to monitor the transmission of the

cavity. While any photodetector may be connected to the amplifier the

specifications, listed in Chapter 3, apply only to detectors supplied with the SA200

series. The amplifier provides a transimpedance gain (current to voltage gain) of

10K, 100K, and 1M V/A while driving a Hi-Z load, such as an oscilloscope. For

better noise and performance characteristics it is recommended that a 50 W coax

cable with a 50 Ω terminating resistor be used. The photodetector input and output

BNC’s are located on the rear panel.

4.2. DC Offset Control

The DC Offset provides a continuously adjustable offset voltage over the range of

0 to 15 V using a 10-turn potentiometer. This offset adds directly to the ramp

signal. The DC offset control is used to adjust the waveform from left to right across

an oscilloscope viewing window, without affecting the calibration of the cavity.

4.3. Sweep Expansion Control

The sweep expansion provides a zoom capability to increase the spectral display

resolution by a factor of 1x, 2x, 5x, 10x, 20x, 50x, and 100x. This is achieved by

scaling the ramp rise time to the sweep expansion.

4.4. Waveform Control

The SA201 allows the user to select between a saw-tooth and triangular waveform.

The saw-tooth waveform is desirable for most applications; however the triangle

waveform is useful for cavity alignment. The SA201 will default to the saw-tooth

waveform during the system power-up. To change the waveform, simply press the

‘WAVEFORM SEL’ button. The selected waveform is indicated by the illuminated

symbol to the right of the waveform select button.

4.5. Power Switch

The power switch is used to toggle the unit on and off.

4.6. Power On Indicator

The power on LED will light when the unit is powered up.

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