OPO Doubler/Mixer (BBO-UV)
                                             -- widest tuning range 189nm to 450nm, no gap!

In response to the demand of applications where intense UV radiation is required over a long wavelength region, We now offer an OPO Doubler/Mixer -- BBO-UV system.

BBO-UV system is designed to generate the widest possible UV range with the output from an OPO or other tunable sources. The superior UV phase matching and transmission properties of BBO has made it the best choice for UV generation. BBO-UV could be configured as an OPO Doubler (BSHG-UV) and an OPO Mixer (BMIX-UV). BSHG-UV could cover 205nm to 450nm with 3 pieces of BBO crystal; BMIX-UV could cover 189nm to 227nm with 2 pieces of BBO crystals. All BBO crystals used in BBO-UV system are based on CASIX's super quality BBO (S-BBO^TM), which has the least amount of inclusion, highest UV transmission and all come with CASIX's proprietary protective coating P-coating).

BSHG-UV

The BSHG-UV system uses two counter rotating BBO crystals to cover the entire UV range. In this orientation, one crystal compensates while the other doubles. Once out of range, the computer controlled acuators could automatically changes the crystals angles so that the first crystal doubles while the second now compensates. A fixed four pieces Pellin-Brocca prism set or a rotating single piece Pellin-Brocca prism assembly separates the UV from fundamental while scanning without any beam wandering or displacement.

The BSHG-UV system's computer control function (optional) allows for automatic tuning and scanning without the need to change filters, optics, or crystals.

Designed for:

• All OPO/OPGs pumped at 355nm/532nm, ns/ps. (e.g. BBO-3B I or BBO-3B II OPOs)
• All ns/ps pulsed dye lasers working in the visible/near IR region.

Modular Structures:

For flexibility, BSHG-UV is offered in modular structures:

• The basic structure of the BSHG-UV is the counter rotating crystal stage. This crystal stage could host 2 BBO crystals at the same time.
• CASIX offer 3 BBO crystals, cut at different angles, to cover the UV range from 205nm to 440nm. These 3 BBO crystals are: Short-UV(205nm to 225nm, cut at 77กใC), Medium-UV (220nm to 290nm, cut at 55กใC)  and Long-UV (280nm to 450nm, cut at 35กใC). These crystals are specially chosen and are the best combination to cover the widest UV range possible with the minimum cost. One could pick up either two of them to selectively cover the UV range of interest. Or one could use just one crystal at a time to lower cost, in this case a UV fused silica compensation block is recommended to compensate for the optical displacement.
• The Polarization Rotation Prism pair could rotate the horizontally polarized input into a vertically polarized input (required).
• A 4 Pellin-Brocca Prism pair or a rotaing single piece Pellin Proca Prism assembly separates the UV from the fundamental, at the same time, keeps the beam position and beam pointing direction fixed.

Tuning range: 3 BBO crystals double 410nm ~ 900nm, generate UV 205nm ~ 450nm. Short-UV(205nm to 225nm), Medium-UV(220nm to 290nm) and Long-UV (280nm to 450nm).

Doubling Efficiency: Depends on the beam quality and intensity of the input beam. Tight focusing with lens is not recommended by us to increase intensity. Please check our C-Doubler for doubling weak (<50MW/cm²), and highly diverging(>1.5mrad) beams.

Input Polarization: Vertical (default) or Horizontal (polarization rotation prism pair required)

Output Polarization: Horizontal, 100:1 (For >10⁵:1, use CASIX a-BBO UV polarizer).

Input Beam diameter: 6mm or less (nominal), larger aperture is possible as an option.

All specifications are subject to change without notice.

Dimensions: (all dimensions are in inches, unless otherwise specified)

The BMIX-UV system uses two BBO crystals. First, it doubles the input from an OPO/Dye laser to generate UV from 230nm to 270nm, and then mix the UV with the 1064nm from a Nd:YAG laser to generate UV from 189nm to 227nm. The BMIX-UV is the best choice for narrow bandwidth OPOs from Spectra-Physics and Continuum, where the directly doubled UV only covers >220nm.

Modular Structures:

For flexibility, BMIX-UV is offered in modular structures:

• The basic structure of the BMIX-UV is the rotating crystal stage. This crystal stage could host 2 BBO crystals at the same time.
• CASIX offer 2 BBO crystals, cut at different angles, to cover the UV range from 189nm to 230nm. The first BBO crystal (Medium UV) will double the 460nm to 550nm input to UV covering 230nm to 290nm, one could spare this crystal if 230nm to 290nm UV is already available from other doublers. The second BBO crystal (Deep UV, cut at 55กใC, will mix the 230nm to 290nm with the 1064nm, to generates 189nm to 227nm.
• The Polarization Rotation Prism + dichroic mirror could control the polarizations of the UV/Visible and 1064nm input such that 1064nm and UV input become vertically polarized, while the Visible input becomes horizontally polarized. The output will be horizontally polarized.
• The 4 Pellin-Brocca Prism pair separates the UV from the fundamental, at the same time, keeps the beam position and beam pointing direction fixed.

Specifications

Tuning range: 3 BBO crystals double 410nm ~ 900nm, generate UV 205nm ~ 450nm. Short-UV(205nm to 225nm), Medium-UV(220nm to 290nm) and Long-UV (280nm to 450nm).

Doubling Efficiency: Depends on the beam quality and intensity of the input beam.

Input Polarization: Default: Visible, Horizontal; 1064nm, Vertical; UV, Vertical Polarization other than Default will need polarization rotation prism + dichroic mirror.

Output Polarization: Horizontal, 100:1 (For >10⁵:1, use CASIX a-BBO UV polarizer).

Input Beam diameter: 6mm or less (nominal), larger aperture is possible as an option.

All specifications are subject to change without notice.

Dimensions: (see drawing in BSHG-UV)

Copyright  1999 U-Oplaz Technologies, Inc. All rights reserved. Last Revised: Sep. 20 , 1999
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