Optical and Laser Components

Vigitek, Inc. developed various custom components for the laser products that we designed. In addition we have close relationships with certain vendors, who manufacture proprietary optical and laser products, frequently with unique specifications. Some of these components were developed specifically for our projects. Unlike some other companies that manufacture or distribute virtually every optical component in existence, we have a limited range of products, but they all are superbly designed and fabricated and exhibit unrivaled performance. 

1. Flowtubes, Monoblocks and Specular Reflectors for Lamp- and Diode-based Pump Chambers.

 Flowtubes and Monoblocks are an essential component of the flashlamp-pumped pump chambers; they carry out the following functions:

– Provide flow-channel for cooling liquid;

– Absorb (filter-out) undesired UV-radiation, reducing heat load, thermal lensing effect and protesting the active medium from long-term solarization;

– Provide internal support for BaSO4 reflectors;

– Blocking lateral stimulated emission, which can depopulate the laser rod and significantly reduce amount of the extracted energy in Q-switched mode.  For the Q-switched Nd:YAG Laser Samarium-doped Glass is the material of choice, because it attenuates lateral depumping effects, thus avoiding super luminescence phenomena and absorbing undesired UV radiation.

 

Cerium Glass and Europium Quartz Glass are also interesting doping materials, because they absorb undesired UV-radiation and can additionally re-emit this energy in the useful spectral range. For free-running lasers, Duran and Quartz Glass are the materials of choice for fabricating the flowtubes, while undoped-YAG and Sapphire can also be used when harsh conditions warrant.

Flowtubes and monoblocks are machined out of a block of glass with highly polished interior and exterior surfaces. The channels containing the laser rod and flashlamps are deep-bored with tight control of dimensions and tolerances on parallelism and perpendicularity. In case of Sm- or Eu-doped glass, the monoblocks are subjected to ion-exchange strengthening in accordance with instructions of glass manufacturer.

All shapes and configurations of monoblocks are available including multi-channel cylindrical, ellipsoid, shotgun, etc. sections with flat or indented end-surfaces for reliable sealing. Please contact us with your specific requirements. 

The monoblocks can be used as part of diffuse pump chambers with BaSO4 reflectors. In addition, the polished exterior cylindrical or elliptical surfaces can be coated with Cu/Ni-protected Silver or Gold coating to form the high efficiency Specular Reflector, with some standard configurations available on a short notice. 

Presence of strong thermo-optical effects in high power diode pumped lasers presents a challenge in obtaining high output power with low-order modes. In various Nd:YAG laser configurations like rod, slab or disk lasers thermally-induced refractive index changes lead to lensing, aberrations and birefringence. For power scaling of diode pumped solid state lasers the uniform pumping configuration and effective thermal management are required.

For better pumping and cooling management of diode-pumped solid-state lasers, our preferred vendor has developed a range of state of the art Sapphire and Fused Silica reflector flowtubes for axial uniform pumping. The barrel surface of flowtubes is coated by Cu/Ni-protected, highly reflective Gold layer. For uniform distribution of laser diodes pumping radiation within laser rod, multiple configurations of flowtubes have been developed. Due to high manufacturing precision combined with innovative know-how, these reflectors demonstrated reduced thermally-induced effects of lensing and aberration, and improved output power and optical-to-optical efficiency of the laser.

2. Laser Pump Chambers.

Vigitek, Inc. designs and manufacturers pump chambers for Solid-State Lasers with very high level of performance in terms of efficiency, pumping uniformity, lifetime and reliability. Three primary types of chambers have been designed:

Diffuse Close-Coupled Design with BaSO4-based Reflector. Power rating ranges from 800 to 1500 W, which can be increased ~2.0–2.5 kW in a custom-configuration where the reflector is cooled separately. The chambers can be configured in all possible combinations: single rod/lamp, single rod/dual lamps, and dual rods pumped by a single lamp.

Reflector assembly consists of glass or Fused Silica monoblock surrounded by several layers of high-purity BaSO4. The body of the chamber is made from aircraft-grade Titanium alloy with virtually a lifetime of maintenance-free operation. The cavity is best suited for pulsed Nd:YAG, Nd:YAP, Er:YAG, Er:Glass, Alexandrite, CTH:YAG and other solid-state laser media. Our power chambers have demonstrated overall efficiencies of almost 6.0% for free-running Nd:YAG laser and in excess of 3.0% for Er:YAG laser, providing very high beam quality.

These pump chmabers can be used with laser rods ranging from 3 x 64 mm to 12.7 x 150 mm.

 

Diffuse Close-Coupled Pump Chamber with Ceramic-based Reflector. This is the most conventional type od chambers used for high-energy lasers, like Long-Pulse Nd:YAG or Alexandrite Laser for dermatology, where pump energies can reach several kJ. At such a high input it’ll be difficult to hold the main seals in a BaSO4-based pump chamber. Therefore priority must be given to the reliability of ceramic reflectors at the expense of efficiency. In order to be able to withstand high power operating conditions the active surface of the reflector must be high-temperature glazed as the ceramic is a porous material.

Our pump chambers are designed in a way that allows simple replacement of the flashlamp by non-technical personnel without disturbing the alignment. Even if something inside pump chamber requires repair or a replacement, simply by lifting up, the chamber can be disconnected from electrical power and cooling loop. And then it can be placed back on the base without having to realign the resonator or the optical fiber coupling arrangement.

 High Average Power Pump Chamber with Gold-Plated Specular Reflector. This pump chamber can be used for an average input poser of up to 6 kW in either pulsed or CW lasers. Due to specular nature of the reflector they are especially suitable for high power TEMoo CW Nd:YAG lasers. In addition we employed unique flow-tubes made from Europium-doped Fused Silica. The main advantages of this material are down-conversion of the near-UV radiation into visible green spectral range, where Nd:YAG has a strong absorption band. This effect increases overall efficiency by as much as 25%. In addition, Europium cuts-off hard UV, thus reducing thermal load on the laser rod and allowing better TEMoo power extraction. Once again pump chamber design allows for an arc- or flashlamp replacement without removing the chamber from its position in the laser head.

These pump chambers have been designed for Nd:YAG rods from 4х100 mm up to 6.3х130 mm.


3. <100> crystallographically–oriented Nd:YAG Rod (Grown and fabricated in Europe).

In particular this pump chamber showed impressive performance, when we employed a specially-grown Nd:YAG rod with -crystallographic orientation. This type of Nd:YAG produces naturally polarized light of a sufficient contrast that does not require a polarizer in the resonator. With this rod we were able to achieve TEMoo output power of almost 35 Watts at 10 KHz repetition rate.

Available sizes: 3×50 to 12.7 x 180 mm

4. Sapphire and Fused Silica Blocks and Light Waveguides (“Light Ducts”).

Light Duct is an optical element that can be used to transport, concentrate and homogenize light emitted by a flashlamp, single diode or an array of diodes. Laser or flashlamp light enters the duct through the curved surface and by means of Total Internal Reflection is transported towards the exit surface with simultaneous compression and homogenization. A broadband AR-coating can be applied to both entrance and exit surfaces to reduce Fresnel losses.

Fused Silica ducts are used primarily for delivery of the laser diode beams, while high thermal conductivity of Sapphire makes it an absolutely essential part of the handpiece for IPL (Intense Pulsed Light) system or a high-energy long-pulse laser with contact cooling. Both rectangular Sapphire blocks and ducts are used in either IPL or laser handpieces. Ducts are primarily used in the spectral region away from the peak of flashlamp emission, where without condensing effect light fluence will not be able to reach therapeutic threshold.

Light ducts must be designed for a given application and concrete geometry and angular spectrum of the light source. Source parameters and desired output characteristics are entered into Monte-Carlo model to optimize the design for the highest possible transmission efficiency.

Please contact us at info@vigitek.biz for more information.

5. Periodically–poled MgO doped lithium niobate crystals (PPMgO:LN) (Grown and fabricated in Europe).

Quasi-phase-matched nonlinear wavelength conversion:

  • SHG
  • OPO;
  • Frequency-mixing.

Compact, efficient and inexpensive blue-green laser devices for:

  • Laser Projection TV;
  • Biomedical And Scientific Application;
  • Color Separation in Printing;
  • Underwater Communications;
  • Material Processing.

 

Specifications. 
 Material  LiNbO3 doped with MgO (MgO:LN)
Crystal Dimensions   0.5 -25 mm L x 1 – 10 mm W x  0.5 – 1 mmThk.
 Period of Domain Structure  4 – 30 µm
 Output Wavelength 780, 671, 590, 540, 532, 488, 473 nm
 Phase-matching Temperature  30 – 80 deg. C
 Polishing  Both Entr. and Exit Surfaces are Optically Polished
 Coating Single- or Dual-Wavelength AR-Coating
 Optical Damage  Threshold  >2 MW/cm2 (specified @532 nm)
 Effective  Nonlinearity  deff = 14-15 pm/V (for 1064-532 nm conversion)
Conversion Efficiency  Up to 70%
Average Power    Up to 10 Watts
Available Standard Crystal Types and Sizes. 
 SHG 1064 → 532 nm (0.5, 5, 10, 15, 20 mm L)
 SHG 1560 → 780 nm (6 mm L)
 3  SHG 1342 → 671 nm
 4 SHG 976 → 488 nm; 946 → 473 nm 
 5  SHG 1080 → 540 nm
 6  SHG 1180 → 590 nm
 7  OPO Domain Period 29…….31.5 µm

 

6. Graded-Reflectivity Mirrors.

Vigitek, Inc. is one of a few companies that in collaboration with the manufacturers of a thin-film coated optics developed a technology of variable-reflectivity coatings, which delivers consistent and repeatable results. And while Nd:YAG mirrors with Ro ~ 30-40% can be obtained from several manufacturers, very few places can fabricate mirrors for low-gain lasers like Alexandrite , where Ro must be on the order of 75-80%, which requires a multi-layer coating that at the same time must withstand a high intracavity fluence of a few J/cm2.

The downloadable form below presents set of required parameters, which must be filled by a customer as completely as possible. We can also design the unstable resonator in accordance with your desired output characteristics. Please either fax the filled-out form to 1(866)406-0478 or e-mail as an attachment to info@vigitek.biz. 

 Download form 

 

7. Mirror Mounts.

Vigitek, Inc. fabricates OEM-type mounts for mirrors, lenses, Q-switches, polarizers etc. that we consider one of the best in the industry. The distinctive features include: mirror replacement without disturbing the alignment, backlash-free alignment crews locking mechanism, overall mount lock, sapphire stops, etc. Lasers containing these mounts were shipped worldwide and maintained their original alignment. This was the case even with Q-switched Nd:YAG lasers with GRM output coupler, which is sensitive to even small misalignment. 

 

 

  

8. Co: Spinel (MgAl2O4) Crystal (Grown and fabricated in Europe)

Passive Q-switches or saturable absorbers generate high power laser pulses without the use of electrooptic Q-switches, thereby reducing the package size and eliminating a high voltage power supply. Co2+:Spinel (MgAI2O4) is the material of choice for the important eye-safe wavelengths near 1.5 microns.It has useful absorption that covers 1.2 to 1.6 micron laser transitions. Spinel is a hard, stable crystal that polishes well. Co:Spinel is most frequently used for passive Q-switching of eye-safe range finders.

Vigitek, Inc., has an exclusive access to the manufacturer of this material (outside of U.S.). The crystal is grown using Czochralski method that delivers high optical quality material with uniform distribution of Co2+ along diameter and length of crystals.

Typical Specifications:
Dimensions of crystal boule, length x diameter, mm   60 x 20
 CoO concentration, mass. %    0.05-0.3
 Orientation:  
 Surfaces:  flat / flat
 Coatings:    AR < 0.25%at 1533nm
 Damage Threshold:  > 1.0 GW/ cm2
 Customer Values Diameter:    typical: 2 – 10 mm
 Initial Optical Density (customer  specified):  0.70, 0.80, 0.90@ 1533nm

 

9. IR and UV Viewers.

Vigitek, Inc. Is an exclusive manufacturer of the photosensitive ceramic material used for visualization of IR- and UV-radiation. The effect is based on up-conversion effect of IR beams and down-conversion of UV radiation. As a result, spectral range of 800-1700 nm is observed as a green light, and UV range between 200 and 400 nm appears as pink-orange color.

 

          

Image of 1470 nm laser diode beam transmitted through cylindrical lens. 

The visualizer material has very high sensitivity [10 µJ/cm2 (pulsed) and 100 µW/cm2 (CW)], zero after-glow and is capable of resolving features of 50 µm or less. Laser beam can be viewed continuously, in real-time and with no saturation. This is an absolutely essential tool when working on laser alignment or for quick and inexpensive analysis of spatial mode structure.

V-IR(UV) Data Sheet 

 

10. Medical Laser Handpiece.

Beam delivery arrangements are the primary specialty of our company and we possess very extensive experience in this area.

Dual wavelength 755/1064 nm laser handpiece with fiber-optics beam delivery

   

  

 

 

 

 

 

Er:YAG Fractional Handpiece, hexagonal or linear pattern, MTZ (micro-thermal zone) diameter 150 µm

 

 

 

   

  

 

 Prototype of the LP Alexandrite handpiece with 2-20 mm spot size range

(for 1000 µm core fiber), contact cooling, defogging circuit, pressure sensor

and spot size feedback. 

 

11. IPL Handpiece.

Over the years we designed numerous handpiece for IPL of various power levels, spectral ranges and skin-cooling methods. One of them is presented in the figures below:

 

In this Ti/Al handpiece the flashlamp is covered by a protected Gold reflector that collects radiation and couples it into rectangular or prism-shaped sapphire light duct. It is mounted between 2 x 100 Watts water-cooled Peltier cooling elements, which cools Sapphire down to a few degrees C. The handpiece has been tested for input power of up to 700 Watts with no signs of epidermal skin damage. Depending on the configuration and power level there are 2 or 3 stages of spectral selection.

 

 

 

 

 

 

 

 

 

 

 

 

 

12. OEM Laser Heads and IPL-pumped Laser Handpieces.

Please go to http://vigitek.biz/category/oem-laser-heads/