Device for the cooling of optoelectronic components and use of a

Details Device for the cooling of optoelectronic components and use of a Device for the cooling of optoelectronic components and use of a

1988-07-21

1991-01-15

Envall, Jr., Roy N.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

357 82, H01L 2504

Patent

active

049858050

DESCRIPTION:

BRIEF SUMMARY
The invention concerns a device for the cooling of optoelectronic components, specifically infrared diode lasers and infrared detectors, with an evacuated cooler housing which is mounted on a base in which there are provided a holding device for the components which through at least one flexible metal band is thermally coupled with the cold station of a cooling unit, and at least one window.
Such a device is known from the German patent document No. 34 45 674 and serves the cooling of infrared diode lasers and infrared detectors at temperatures down to the range of 10 K.
Such low temperatures are usually generated using two-stage coolers according to the Sterling principle with a continuous helium circuit, where the areas with low temperature are insulated from a housing at room temperature by vacuum. The periodic helium expansion in the cooler causes mechanical vibrations which should only minimally transfer to thermally coupled diode lasers or detectors. The prior device provides for that purpose a bar arrangement that features a bar which extends transversely through the cooler housing and is mounted on both ends on rigid supports which are rigidly connected with a massive base on which the cooler housing is mounted with soft vibration dampers. While the known design achieves an effective vibration decoupling of the optoelectronic components, the cooler housing vibrates and thus also the window which is provided in the cooler housing for the emergent or incident radiation. Minute reflections on the window cause the back coupling of fractions of the radiation intensity back to the radiation supplies, which greatly influences especially diode lasers. With the window vibrating in the path of rays, the reflected radiation is irregularly modulated, causing severe disturbances in diode lasers.
Based on this prior art, the invention addresses the problem of providing a cooling device of the initially mentioned type where both interferences by vibration of the holding device and interferences by vibrations of the cooler housing are effectively suppressed.
This problem is inventionally solved in that the housing of the cooling unit is for vibrational decoupling connected with the cooler housing and sealed against atmospheric pressure through ring-shaped rubber-elastic sealing means and in that the singular holding device, thermally coupled through a flexible metal band with a cold station protruding into the cooler housing, features a holding plate which is arranged on one end of a thin-walled, essentially prismatic or cylindrical hollow body from thermally poorly conducting material, the other end of which body is rigidly connected with the base of the cooler housing.
An object of the invention is also the use of a flange joint featuring the ring-shaped rubber-elastic sealing means.
In a suitable embodiment of the invention, the prismatic or cylindrical hollow body consists of four epoxy resin panels of slight material thickness which rectangularly are connected rigidly with one another. Formed in this way is a rigid structure which in the panel direction nonetheless is a poor thermal conductor.
One arrangement offers the additional advantage that the temperature of the various optoelectronic components can be adjusted and controlled separately. The distributor rails to which the copper bands of the various holding devices are thermally coupled are preferably so mounted that they can thermally expand in longitudinal direction but, to avoid the transmission of vibrations, cannot move as a whole.
The invention will be more fully explained hereafter with the aid of an embodiment illustrated in the drawing.
FIG. 1 shows a holding device of the device for the cooling of optoelectronic components in a perspective view;
FIG. 2, a sectional view of the cooler housing of the device;
FIG. 3, a lateral view of a distributor rail, partly in section, illustrating how the distributor rail is mounted on the base of the cooler housing;
FIG. 4, a plan view of the cooling device, partly in section;
FIG. 5, a modification of the

REFERENCES:
patent: 3274030 (1966-09-01), Salomon
patent: 3889119 (1975-06-01), Whicker
patent: 4106076 (1978-08-01), Miller
patent: 4161747 (1979-07-01), Frosh
"Wave-Number Stability of a Laser Diode Mounted in a Closed Cycle Helium rigerator", The Review of Scientific Instruments, vol. 50, No. 12, 1979.

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