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Wavelength References
Operators Manual
TM
Clarity
Precision Frequency Reference
Laser Locked to a Molecular Absorption Line
Operating Manual 0700-M Rev C
Copyright Wavelength References, 2012
All Rights Reserved
Wavelength References
rd
1800 SW 3
Street, #140
Corvallis, OR 97333
Voice (541)738-0528
Fax (541)-738-0998
E-mail:
sales@wavelengthreferences.com
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Table of Contents
Summary of Contents for Wavelength References Clarity Series
- Page 1 Wavelength References Operators Manual Clarity Precision Frequency Reference Laser Locked to a Molecular Absorption Line Operating Manual 0700-M Rev C Copyright Wavelength References, 2012 All Rights Reserved Wavelength References 1800 SW 3 Street, #140 Corvallis, OR 97333 Voice (541)738-0528...
- Page 2 This warranty is given by Wavelength References in lieu of any other warranties, expressed or implied. Wavelength References and its vendors disclaim any implied warranties of merchantability or fitness for any particular use.
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Page 3: Table Of Contents
Table of Contents Introduction ....................2 Product Overview ................2 Application ..................2 Visual and Operational Inspection ..........3 Options and Accessories ..............3 Operating Environment ..............3 Theory of Operation ..................4 Operating Principles ................ 4 Accuracy ..................5 Connections .................... -
Page 4: Introduction
4 will be most informative. This manual is intended to coincide with firmware version 1.00. For other firmware versions, please consult the appropriate manual or contact Wavelength References for information. Product Overview The Clarity is a semiconductor laser that is locked to a molecular absorption line. Lasers can be offered with wavelengths chosen from the spectra of acetylene, hydrogen cyanide, hydrogen fluoride, carbon monoxide, carbon dioxide and other gases, please inquire. -
Page 5: Visual And Operational Inspection
oxide and other species such as hydrogen fluoride, hydrogen chloride, hydrogen sulphide, carbon monoxide, acetylene, ammonia, and others. The absorption line can be scanned under software control and along with the electrical output of the gas cell the laser is an extremely useful tool in gas sensing and gas sensing system development. -
Page 6: Theory Of Operation
A search of available wavelength references turns up only a few candidates in the 1550nm band. There is only one known gas laser reference line: the helium-neon 1523nm laser line. This laser line has a much lower gain than the more common 633nm helium-neon laser line. -
Page 7: Accuracy
For Reference Mode the absorption signal is detected by a photodiode and digitized. The digitized data is sent to the microprocessor which uses the data to tune the laser wavelength to track the desired absorption signal. The laser wavelength is adjusted by means of a unique dual loop configuration controlling both the laser bias and chip temperature. -
Page 8: Connections
line to narrow the linewidth of the laser. This combined with a custom semiconductor laser can offer linewidth below 30KHz. This linewidth is an actual measured value and is not modeled on a lorentzian assumption. The data sheet includes typical graphs of the lineshape for the two versions of the NLL laser (the NLL and the NLL-HP). -
Page 9: Operating Instructions
Operating Instructions Getting Started 4.1.1 Password The Clarity ships with a factory-set password of 1234. Each time the instrument is turned on, the and ▼) to reach 1234, then user is asked to enter a password. Press the directional buttons (▲... - Page 10 and ▼) change the options within each setting. the four settings, while the directional buttons (▲ Pressing MENU a second time returns the user to the original front panel display. 1. Periodic Calibration: Sets the time between automatic re-calibrations. Options are 5, 15, 60 minutes or OFF.
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Page 11: Lock Mode
4.2.2 LOCK MODE The Clarity has two possible lock modes: Center and Side. Center refers to the peak (center) absorption wavelength for the gas line referenced by the particular Clarity model (for example, the PFR-1530 locks to the acetylene P9 line at 1530.37095 nm or 195.895288 THz). This is used in Reference Mode. -
Page 12: Frequency And Wavelength
Laser will automatically disable. Allow instrument to reach room temperature and re-calibrate. Status will clear after a successful calibration. If problem persists, contact Wavelength References. "Temp Error": Occurs when the microprocessor's temperature is out of spec. The laser will automatically be disabled. -
Page 13: Troubleshooting
Fig. 8 1. Remote Interlock: The Clarity ships with a BNC short on the Remote Interlock input located on the rear panel. If the connection at the Interlock port is opened the laser will automatically disable. If the BNC short is replaced with an interlock circuit (for example, a door sensor), ensure the circuit is closed prior to laser operation. -
Page 14: External Interface
External Interface External interface to the Clarity laser is provided by means of the RS-232 connector. To use, connect the instrument through a suitable RS-232 session, such as HyperTerminal in Windows. Baud rate is initially set to 9600, the transmitter terminator to CRLF and the flow control to Xon/Xoff. The command set is listed below. - Page 15 Queries verbose state [SYSTem:]VERBose? IEEE 488.2 Requirements Clear status command *CLS Standard event status register *ESE <numeric value> *ESE? Identification query *IDN? Operation complete enable *OPC *OPC? Reset command *RST Read status byte query *STB? Wait for calibration to complete *WAI...
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Page 16: Error And Event Codes
Error and Event Codes The eight most recent error and event codes are stored in an array and can be queried with the command “SYSTem:ERRor:[NEXt]?”. Query repeatedly to produce the full array. Error Code Definitions //No event messages "0, "No error” // No error "1, "Empty input buffer”... -
Page 17: Specifications
Specifications Table of Specifications Specification Performance Notes Wavelengths available 1530nm Standard for PFR, NLL-HP 1542nm Standard for all options 1312nm Standard for PFR 1653nm Standard for PFR, methane sensing Other wavelengths Inquire Lock wavelength modes Reference Lock Locks to the center of the absorption line. Line Narrowing Locks laser to the slope of the absorption line At 25C ... -
Page 18: Safety And Regulatory Compliance
Safety and Regulatory Compliance The laser used in the Clarity is by itself a Class IIIB device. The power supply used in the product completely complies with EN60950 1992 +A1, +A2:1993, +A3:1995, as well as LVD 73/23/EEC The standard acetylene cell contains about 50 micrograms of acetylene at about 0.03 atmospheres pressure.
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