# US 11,079,281 B2 · Cold stage actuation of optical elements including an optical light shield and a lenslet array connected to a cold finger

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- Number: US 11,079,281 B2
- Document ID: US11079281B2
- Status: Granted
- Kind: B2
- Application number: 16/250,913
- Filed: 2019-01-17
- Published: 2020-07-23
- Granted: 2021-08-03
- Earliest claimed: 2019-01-17
- Assignees: Uvia Group LLC
- Applicants: Uvia Group LLC
- Inventors: Michele Hinnrichs
- Web page: https://patentgrep.com/patent/US11079281B2

## CPC

- G01J 5/061: by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats
- G01J 3/02: Details
- G01J 3/0202: {Mechanical elements; Supports for optical elements}
- G01J 3/0205: {Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows}
- G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction}
- G01J 3/021: {using plane or convex mirrors, parallel phase plates, or particular reflectors}
- G01J 3/0216: {using light concentrators or collectors or condensers}
- G01J 3/0237: {Adjustable, e.g. focussing}
- G01J 3/0286: {Constructional arrangements for compensating for fluctuations caused by temperature, humidity or pressure, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a spectrometer, e.g. vacuum}
- G01J 3/0291: {Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements}
- G01J 3/0297: {Constructional arrangements for removing other types of optical noise or for performing calibration}
- G01J 3/18: using diffraction elements, e.g. grating (gratings per se G02B)
- G01J 3/2803: {using photoelectric array detector}
- G01J 3/2823: {Imaging spectrometer}
- G01J 5/04: Casings
- G01J 5/06: Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity (for adjusting of solid angle of collected radiation G01J5/07; means for wavelength selection G01J5/0801)
- G01J 5/0806: Focusing or collimating elements, e.g. lenses or concave mirrors
- G01J 5/084: {Adjustable or slidable}
- G01J 5/0875: Windows; Arrangements for fastening thereof
- G01J 5/10: using electric radiation detectors
- G01J 5/601: {using spectral scanning}
- H10F 77/60: Arrangements for cooling, heating, ventilating or compensating for temperature fluctuations
- G01J 2005/0077: {Imaging}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION

## Abstract

A cold stage actuation system employs an optical assembly having an adapter ring mounted to a flange connected to a cold finger which extends into a Dewar housing. The flange supports a detector array. A resilient cold shield extends from the adapter ring to a lens holder, the lens holder connected to the resilient cold shield distal from the adapter ring. The lens holder supports a lenslet array. An optical light shield extends from the lens holder oppositely from the resilient cold shield to proximate a window in the Dewar housing. A motor is supported within the Dewar housing. An insulating translation arm connects the motor to the optical light shield, whereby operation of the motor induces the insulating translation arm to extend or retract the optical assembly concentric with an optical axis.

## Claims

### Claim 1

A cold stage actuation system comprising:
a dewar;
a cold finger extending into the dewar;
an optical assembly having:
a flange connected to the cold finger;
a detector array supported in the flange;
an adapter ring mounted to the flange;
a lens holder;
a lenslet array;
a resilient cold shield extending from the adapter ring to the lens holder, the lens holder supported by the resilient cold shield, said resilient cold shield transmitting thermal energy to the cold finger;
said lens holder connected to the resilient cold shield distal from the adapter ring, said lens holder supporting the lenslet array, wherein the resilient cold shield acts as a path to cool the lenslet array;
a motor; and
an insulating translation arm connected to the motor and connected to the optical assembly, whereby operation of the motor induces the insulating translation arm to extend or retract the optical assembly concentric with an optical axis.

### Claim 2 (depends on 1)

The cold stage actuation system of claim 1, further comprising:
a window in the dewar; and
an optical light shield extending from the lens holder oppositely from the resilient cold shield to proximate the window, the optical light shield conductively cooled by the cold finger through the resilient cold shield, said insulating translation arm connected through the optical light shield to the lens holder.

### Claim 3 (depends on 1)

The cold stage actuation system as defined in claim 1, further comprising:
one or more light baffles extending intermediate the lens holder and the adapter ring, and conductively connected to the cold finger.

### Claim 4 (depends on 3)

The cold stage actuation system as defined in claim 3, wherein the one or more light baffles are connected to the lens holder.

### Claim 5 (depends on 3)

The cold stage actuation system as defined in claim 3, wherein the one or more light baffles are connected to the adapter ring.

### Claim 6 (depends on 3)

The cold stage actuation system as defined in claim 3, wherein the one or more light baffles are resiliently corrugated and are connected to and extend between the lens holder and the adapter ring.

### Claim 7 (depends on 1)

The cold stage actuation system as defined in claim 1, wherein the motor is supported within the dewar.

### Claim 8 (depends on 1)

The cold stage actuation system as defined in claim 1, wherein the dewar comprises an external cavity, and the cold stage actuation system further comprises:
a drive rod from the motor axially translatable within the external cavity;
a first magnetic element attached to the drive rod; and
a second magnetic element arranged for a magnetic coupling with the first magnetic element concentric to the external cavity and first magnetic element, and attached to the insulating translation arm, whereby a translation of the first magnetic element within the external cavity is mirrored by a translation of the second magnetic element and the insulating translation arm, thereby extending or retracting the optical assembly along the optical axis.

### Claim 9 (depends on 1)

The cold stage actuation system as defined in claim 1, further comprising:
a drive rod;
a vacuum seal in the dewar receiving the drive rod to axially translate into the dewar; and
a bellows spring attached at a first end to the drive rod and attached at a second end to the insulating translation arm, whereby a translation of the drive rod creates a compression or an extension force in the bellows spring that is transferred to the insulating translation arm to extend or retract the optical assembly.

### Claim 10 (depends on 1)

The cold stage actuation system as defined in claim 1, wherein the resilient cold shield has a corrugated wall extending from the adapter ring to the lens holder.

### Claim 11 (depends on 10)

The cold stage actuation system as defined in claim 10, wherein the corrugated wall of the resilient cold shield has an initial fully retracted position in which the corrugated wall is in a relaxed condition, and an activation of the motor to extend the optical assembly along the optical axis resiliently extends the corrugated wall through a range of motion from fully retracted to fully extended.

### Claim 12 (depends on 10)

The cold stage actuation system as defined in claim 10, wherein the corrugated wall of the resilient cold shield is neither compressed or decompressed in a neutral position in a range of travel, and upon an actuation of the motor, a translation of the optical assembly is performed by stretching or contracting the corrugated wall of the resilient cold shield.