XRS3 - XRS3 Dual-Wavelength Small Frame Unpolarized Helium Cadmium Laser Systems
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Output power to 50 mW at 442 nm or 18 mW at 325 nm |
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Pointing stability better than 20 μrad |
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CE, IEC, CDRH, and cTUVus compliant |
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CVI Melles Griot small-frame helium cadmium lasers, the world's most compact and rugged high-performance HeCd systems, are ideal sources for automatic optical inspection, biomedical fluorescence detection, confocal microscopy, wafer inspection, and a wide variety of other applications. These systems exhibit excellent pointing stability and mode quality (single-mode versions) as well as long operational life.
The helium cadmium lasers incorporate a unique internal-mirror design which eliminates the losses introduced by optical windows, coupled with a rugged Invar external support structure. The result is a system that has exceptional output power for its size and, from a cold start, reaches full power and stability in just 15 minutes. The Invar support structure provides the outstanding long-term power and pointing stability required for scanning applications.
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Small-frame helium cadmium laser head
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Small-frame helium cadmium power supply/controller
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| Specifications | |
Beam Diameter (1/e2)
(mm) | 2.9/2.8 |
Beam Divergence (1/e2)
(mrad) | 1.9/2.6 |
| M2 | <4/<9 |
| Mode | Multimode |
Noise (dc–2 MHz)
(% rms) | 1.0/0.8 |
Output Power
(mW) | 15/35 |
| Special Handling | This product must be run a minimum of 24 hours every two weeks in order to maintain optimum power and guaranteed performance. If you feel you are unable to perform this maintenance procedure please contact our technical support group at for alternate product selections. |
| Wavelength (nm) | 325/442 |
| Beam Characteristics |
| Coherence Length | 10 cm |
| Longitudinal Mode Spacing | 268 MHz |
| Output Wavelength | 325 nm, 442 nm or dual wavelength |
| Polarization | Random |
| Environmental Requirements |
| Maximum Shock (in shipping container) | 30 G |
| Nonoperating Temperature | -40°C to +60°C |
| Operating Humidity | 0% to 90%, noncondensing |
| Operating Temperature | 10°C to 40°C |
| Operational Characteristics |
| Cooling | Forced air |
| Recovery from Standby | <5 minutes |
| Warm-up Time | <15 minutes from cold start |
| Safety and Regulatory Compliance |
| CDRH Class | IIIb |
| CE | Compliant |
| IEC Class | 3B |
| Stability Characteristics |
| Pointing Stability | <20 μrad at ambient ± 2°C |
| Power Stability | ± 2% over a 4-hour period |
| Weight |
| Laser Head Weight | 7.7 kg (17.0 lb) |
| Power Supply Weight | 10.2 kg (22.5 lb) |
Frequently Asked Questions (FAQs)
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Yes it is. In our previous catalogs, we sold the laser heads and the power supplies separately, whereas in our new catalog we have grouped them together to be sold as systems. We found that most people ordered both the laser head and its appropriate power supply on the same orders, so we decided to sell them as a system to make it easier on the consumer. The 05LHP151 is the part number for just the laser head while the new system part number 25 LHP 151-249 designates the same laser head with its corresponding US power supply. We understand that our customers may only need to buy just the laser head or just the power supply, so we still sell them individually. Commonly, we can still supply a laser head or power supply, but just haven't listed it in the catalog or on the website. This particularly applies to our older components. Most of the time these are still available and can be purchased by calling us directly. Simply contact the CVI Melles Griot's Applications Engineering department to find the appropriate parts: Customer Support. |
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Helium Neon lasers can range from 800 MHz to 1575 MHz full-width-at-half-maximum (FWHM) depending on the design. The typical 632.8nm HeNe is 1400 MHz. The width of a single mode located under the gain curve is typically 1 MHz. |
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While re-gassing can provide some extension of the output performance in some gas lasers like the CO2, Argon and the higher powered side arm HeNes (which have external optics), it is not recommended or provided for smaller internal mirror coaxial tubes. Typical end-of-life failure for a HeNe is cathode sputtering. This occurs when the protective oxide layer on the cathode is expended through continuous bombardment by the laser discharge. There is no cost effective way of regenerating this layer. When the oxide layer is expended, the discharge itself vaporizes the "raw" aluminum and deposits this material, in its vapor state, on other surfaces such as the optics and the glass bore. |
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Most of our HeNe laser heads are CDRH / CE certified. Certified product for CDRH falls under one of the following classifications: Class II (<1.0mW), ClassIIIa(<5.0mW) or Class IIIb(<575mw). For CE our lasers are certified as a class 2 or 3B. Plasma tubes including some laser heads are not certified. In this case, it is the responsibility of the end-user to certify their system by meeting agency approvals. If CDRH / CE certification is a requirement for your system, be sure to verify the laser you select meets your needs. |
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All CVI Melles Griot HeNe lasers have a recommended Laboratory or Module power supply (AC and DC input versions available), typically listed on the laser's specifications sheet. If you are unsure which one is appropriate, please call us at 1-800-835-2626 and ask for a Laser Applications Engineer. Rule of thumb in choosing a power supply: If you know the operating voltage and current of your laser, the power supply must have a voltage range large enough to fit the operating voltage for the laser and must be set at the appropriate operating current. |
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Coherence length is defined as the length over which energy in two separate waves remains constant. With respect to the laser, it is the greatest distance between two arms of an interferometric system for which sufficient interferometric effects can be obtained:
Lc=c/Dn L Coherence length will vary from laser to laser as a function of the Doppler broadened gain width; however, for a HeNe 20 - 30 cm is typical. |
| Product/PN | AutoCad
(pdf) | AutoCad
(dxf) | SolidWorks | Step | Manual | Spec
Sheet | Compliance
Documents | Catalog
Page | Press
Release | ROHS |
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Click Document title to view Document. |
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| Document | Description |
| Basic Laser Principles | Basic Laser Principles |
| Fiber-Optic Laser Beam Delivery Systems | Laser-to-fiber couplers use a lens to focus the light from the laser to a spot matching the size of the fiber core. The coupler is attached directly onto the laser and uses a patented tilt adjustment technique |
| Frequency and Amplitude Fluctuations | Frequency and Amplitude Fluctuations |
| High Energy Laser Damage Threshold | Measurement definitions and results |
| Introduction to Air-Cooled Ion Lasers | CVI Melles Griot is a major manufacturer of air-cooled ion lasers for OEM applications in medicine, reprographics, and analytical instrumentation. Consequently, we offer a wide variety of standard and custom options. For complete, turnkey systems that meet all of the environmental and emission requirements for stand-alone systems, click Buy Online in the table below. To review our complete product offering, including customization options, click on the Build to Order icon. |
| Introduction to Diode Laser Assemblies | Diode Laser Assemblies are readily available at wavelengths varying from 408 nm to 1.6 µm and above, and at output power ranging from a few milliwatts to several watts. Because of their small size and exceptional efficiency, diode lasers have replaced the HeNe laser in many OEM applications, particularly in those where beam quality and wavelength stability, and unit-to-unit repeatability are not critical. Melles Griot does not manufacture laser diodes! It does manufacture diode laser assemblies that include beam-conditioning optics, automatic power control (APC), temperature control, environmentally sound packaging, and any other features required to meet your exact design goals. |
| Introduction to Helium Cadmium Lasers | The helium cadmium (HeCd) laser is a member of the same laser family as the HeNe, and is the only relatively economical, continuous-wave (cw) source of violet (442-nm) and ultraviolet (325-nm) output. Because of its excellent match to photo polymer and film sensitivity wavelength ranges and its good beam quality, it is used extensively for three-dimensional stereolithography applications, as well as for creating embossed holograms |
| Introduction to Helium Neon Lasers | The helium neon laser was the first laser to be used in volume applications. Currently, there are millions of HeNe lasers in the field, and only the semiconductor diode laser is produced in greater volume. The key to the HeNe's success has been its low cost, small size, long operating life (as much as 50,000 operating hours), and unsurpassed beam quality. HeNe lasers produce milliwatts of output power and are available in a variety of wavelengths ranging from 543 nm (green) to 1.523 μm (infrared). The most common wavelength is the familiar 633 nm (red). These lasers are small, convection cooled, and can be operated from ordinary household power or even from batteries. |
| Introduction to Solid-State Lasers | Diode-pumped solid-state (DPSS) microchip lasers are an exciting new tool for OEM applications that combines the beam quality of a gas laser and the small size and efficiency of a diode laser with single-line output in the blue (473 and 488 nm), green (532 nm), or yellow (561 nm). |
| Laser Accessories Overview | Beam expanders, laser collimator, laser to fiber couplers, fiber optic beam delivery systems, laser beam dumps, adapter holders, focusing optics, precision mounted anamorphic prisms, F-Theta lenses |
| Laser Applications | Laser Applications |
| Laser Guide | Laser Guide |
| Laser Selection Guide | CVI Melles Griot manufactures a wide variety of lasers with over 32 discrete wavelengths ranging from the ultraviolet to the near infrared. We offer three basic types of lasers: gas lasers (HeNe, HeCd, Ion), diode-pumped solid-state (DPSS) lasers, and semiconductor diode lasers assemblies. |
| Laser Types | Laser Types |
| Propagation Characteristics of Laser Beams | Propagation Characteristics of Laser Beams |
| Single Axial Longitudianl Mode Operation | Single Axial Longitudianl Mode Operation |
| Transverse Modes and Mode Controls | Transverse Modes and Mode Controls |
| Tunable Operation | Tunable Operation |
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