Precision Crystal Oven & Temperature Controller
                                                          -- 0.1°C accuracy from Room Temperature to 220°C

In response to the demand of precision crystal oven temperature controller, and the trend of miniaturization of optical devices, we now introduce our second generation of Crystal Oven and Temperature Controllers. We also include the Ordering Information and Installation of Crystals.

Crystal Oven Specifications

The two crystal ovens have a small footprint which allows the oven to be mounted on standard 1 and 2 optical mounts. This is very important for quick experiments where limited space and time do not allow specially designed mechanical part to fit in. It also saves precious time and money for product development.

Model S crystal oven is especially designed for crystals like LBO, KNbO3 which require precise and stable temperature control.

Model L is especially designed for crystals like periodically poled crystals, as well as big crystals where precise and stable temperature control are necessary.

Note:
1. The oven can be added windows on both end faces or not.
2. The standard crystal's size for the oven only:
3x3xL, 4x4xL, 5x5xL, 6x6xL and 7x7xL mm , L is up to 25mm.

Temperature Controller Specifications

The new temperature controller (CX2) is microprocessor controlled, and have dual line 4 digits LED display (set point and real temperature). It is very easy to operate, and accepts both 110V and 220V power sources.

Physical Size: 155(L)x105(W)x70(H) mm
Temperature Range: Room Temperature to 220°C
Sensor: Thermocouple, RTD (P392, n120, P385), DC Current, DC Voltage
Connector:4-pin audio jack
Power line:About 1 meters with 2-pin connector
AC power:85 to 265VDC or VAC, 50 through 400Hz ( This applies to the instrument power only)}
Warm-up time:          60 minutes *
Resolution:                 0.1°C
Stability:                     better than ±0.1°C
Dissipation Power:   <25W
Relative humidity:    No sensitive
Power consumption: < 5VA
Operation load:         3.5A @ 250V at 25°C and debate to 1.25A @ 55°C
Environment Temp.:-10°C to +55°C
Operating Temp.:    -200°C to 875°C for RTD P835 and P392
                                  -80°C to 320 RTD n120
                                   From -212°C to 1760°C for some other sensor
Humidity:                    0 to 90% up to 40°C non-condensing     
                                   0 to 50% at 55°C non-condensing
Weight                        about 300g
Set point range:         Selectable

* Slow heating rate is suggested for LBO crystal, in order to prevent coating damage due to fast inhomogeneous expansion.

Installation of Crystals

As the figure shown above, to install crystal in the crystal oven:

1. Turn the #2-56 screw on the side of the crystal oven clockwise to pull up the pressure bar inside the crystal oven, until there is enough room for the crystal.
2. Put the crystal into the oven by sliding it into the square hole of the crystal oven. Use wide blade plastic tweezers to hold the crystal and push it into the square hole. Avoid touching the surface of the crystal’s clear aperture at all time. Put the crystal in the center of the oven.
3. Turn the same #2-56 screw on the side of the crystal oven counter-clockwise to release the pressure bar inside the crystal oven, after the pressure bar touches the crystal’s top, release an extra two rounds ¨C this will give enough force for the pressure bar to hold the crystal.

! Do not try to adjust the fixed setscrew, which is glued to the crystal oven.

! Do not release the pressure bar without the crystal inside the crystal oven, and do not continue to release the pressure bar when the #2-56 screw is already out of the threaded hole ¨C try to screw the #2-56 screw back into the pressure bar for at least one round. Over-release the pressure bar will let the pressure bar fall off the crystal oven and it is very difficult to put it back on, without special tools.

Applications:

• LBO NCPM SHG of YAG/YLF/YVO₄
• LBO NCPM OPO Pumped by the SHG of YAG/YLF/YVO₄ or Ti:Sapphire laser
• KNbO₃ NCPM SHG 860-940 nm (a-cut)
• SHG 990-1070nm (b-cut)
• LiNbO₃ NCPM SHG of YAG/YLF/YVO₄
• Increase damage threshold of KTP and LiNbO₃

Application Notes:

One of the major application of temperature controlling in nonlinear optical conversion is to use the Non-Critical Phase Matching (NCPM) for some non-linear optical crystals, e.g. LBO and KNbO₃. NCPM is preferred because it could generate superior beam quality and efficiency. It has very large acceptance angle and zero walk-off which are very important for doubling tightly focused laser beam or laser beams with large divergence.

NCPM Applications:

Reference:

[1]. T. Ukachi et.al. Appl. Phys. Lett., 57, 980 (1990)
[2]. Jean-Claude Baumert and Peter Gunter, Appl. Phys. Lett., 50, 554 (1987)
[3]. K. Kato, Opt. Commun. 13, 361 (1975)
[4]. M.V. Ortiz et.al. Technical Digest of Advanced Solid-State Lasers, WF1-1, p302, Santa Fe, New Mexico, Feb. 17-19, 1992

Ordering Information:

Customized oven sizes and structures available upon request, call for price. We also provide oven and temperature controller for heating and stabilizing crystals to a certain temperature with a lower precision and lower price.

Oven and temperature controller with other size or higher temperature accuracy are available upon request.

Copyright  1998 U-Oplaz Technologies, Inc. All rights reserved. Last Revised: Sep. 20, 1999
Web Page maintained by : Uoplaz@aol.com