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(Reference: Basics of Scan Lens)

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Single-element lens

Two-element lens

 

 

(1) Un-mounted Single-element Scan Lenses, STSL Series

 

STSL scanner lenses specially designed and optimized for use in CO2 laser 2-axis galvo-scanner systems with full beam diameters of up to 15.0mm.  Mirror sets appropriate for use with beam diameters up to 15mm require an increase in mirror separation in comparison with smaller mirrors. These changed optical conditions are catered-for by the STSL series. These single-element lenses are designed to represent the best achievable compromise for on-axis and off-axis aberrations, field flatness and F-theta characteristics, obtainable using single-element spherical-surface designs of (standard) 48mm diameter and 3mm edge thickness. The lens material is ZnSe.

 

Part Number

Focal Length (mm)

Field Size (mm)

Working Distance (mm)

Focused Beam Diameter (um)

Average

Diffraction Limit

STSL-10.6-50-75

75.2

50x50

74.17

171

86

STSL-10.6-70-101

101.3

70x70

101.39

181

116

STSL-10.6-105-149

149.1

105x105

150.59

219

171

STSL-10.6-120-175

175

120x120

177.39

243

200

STSL-10.6-125-179

179.2

125x125

179.23

247

205

STSL-10.6-140-201

200.6

140x140

203.53

269

230

STSL-10.6-155-226

225.5

155x155

227.96

296

258

STSL-10.6-175-249

249.4

175x175

253.26

320

285

STSL-10.6-210-298

298

210x210

302.56

373

341

STSL-10.6-250-363

362.6

250x250

368.19

445

415

STSL-10.6-280-394

394.4

280x280

401.44

481

451

STSL-10.6-300-433

432.7

300x300

440.97

525

495

STSL-10.6-340-482

482

340x340

492.3

581

551

STSL-10.6-415-592

591.7

415x415

586.5

717

677

STSL-10.6-500-717

716.5

500x500

730.03

850

820

STSL-10.6-680-978

977.6

680x680

977.6

1151

1118

STSL-10.6-840-1183

1183

840x840

1205

1389

1353

STSL-10.6-850-1201

1201

850x850

1216

1409

1374

Remark:

(1) The lenses are meniscus form; one concave and one convex surface.

(2) The concave always faces the incident beam.

(3) For all STSL lenses, the diameter is 48.0 +0/-0.1 mm, and the edge thickness is 3.0 +/-0.1 mm.

(4) X scanning mirror is 34.8mm from the edge of the first (concave) surface and the Y scanning mirror is 17.1mm from the edge of the first (concave) surface.

(5) Default is un-mounted. Mounted version is available upon request. Following is the pictures of the mount:

 

(2) Mounted Single-element Scan Lenses

    

 

Model

Scan area (mm)

WD
(mm)

EP (mm)

Scan angle()

FD (mm)

Rectangular

Round

STDC-30

3636

f51

72

11

15

25

STDC-60

6060

f86

97

11

20

25

STDC-80

8080

f113

102

11

25

25

STDC-90

9090

f128

119

11

25

25

STDC-110

110110

f156

151

11

25

25

STDC-110-14

110110

f156

146

14

30

23

STDC-125

125125

f177

175

11

25

25

STDC-175

175175

f247

252

11

25

25

STDC-200

200200

f283

294

11

25

25

STDC-250

250250

f352

371

11

25

25

STDC-300

300300

f424

447

11

25

25

STDC-350A

350350

f497

531

11

25

25

STDC-350B

350350

f497

427

11

30

25

STDC-400A

400400

f566

608

11

25

25

STDC-400B

400400

f566

506

11

30

25

STDC-500A

507507

f718

772

11

25

25

STDC-500B

500500

f708

616

11

30

25

 

Model

EP(mm)

Scan angle()

Scan area (mmmm)

Spacing#(mm)

WD (mm)

Focused beam dia.(um)

Center

edge

STDC60-20

20

20

6060

30

122.5

278

300

STDC80-20

20

19

5959

33

128.5

247

264

STDC90-20

20

17

6060

33

145.5

237

252

STDC100-20

20

23

100x100

30

176

135

143

  # the distance between the two scan mirrors. The lens material is GaAs.

 

Part No.

FL

(mm)

SA

()

SL

(mm)

SAR

(mmxmm)

MI

(mm)

AS

(mm)

Length (mm)

MO

(mm)

MT

WD

(mm)

STS-9068/181

68.00

25.00

59.00

41x41

8.00

17.26

47.00

90.00

M85x1

42.00

STS-9100/181

100.00

25.00

87.00

61x61

10.00

15.67

47.00

90.00

M85x1

65.00

STS-9163/181

153.00

25.00

133.00

94x94

12.00

15.97

47.00

90.00

M85x1

150.00

STS-9254/181

254.00

25.00

221.00

156x156

12.00

17.26

47.00

90.00

M85x1

230.00

Remark: FL=focal length; SA=scan angle; SL=scan length; SAR=scan area; MI=max. input beam diameter; AS=aperture stop; MO=max. outside diameter; MT=mounting thread; WD=working distance; PW=protective windows. 

 

(3) Mounted 2-element Scan Lenses, STC Series
 

The mounted 2-element scan lenses are 2-element designs for CO2 laser beams up to 15mm diameter, supplied complete in a mechanical housing. These lenses give excellent F-theta performance, with resolution (focused spot size) at, or very close to the diffraction limit over a flat image plane. Variation of spot size (standard deviation from average spot size over the full scanned field) is minimal.The lens material is GaAs.

 

 

Model

WD
mm

Scan area (mm)

Spot size  (centre) m

Spot size
(off axis)
m

EP
(mm)

Scan angle
()

FD
mm

Rectangular

Round

STC-40

95

3636

51

115

135

11

20

27

STC-80

118

8080

113

120

140

11

27

16

STC-110

145

110110

156

210

225

16

30

17

STC-125

188

125125

177

235

285

16

30

17

STC-175

257

175175

247

245

300

16

30

18

STC-200

294

200200

283

320

365

16

30

19

STC-250

360

250250

354

330

375

16

30

20

STC-300

433

300300

424

385

430

16

30

20

STC-350

502

350350

495

400

450

16

30

20

STC-400

569

400400

566

420

485

16

30

20

STC-500

803

500500

718

460

520

16

30

21

STC-700

960

700700

990

530

680

16

30

21

 

Standard -Theta Lenses for CO2 10.6μm (Flat field type - 2 element version)

Part No.

FL

(mm)

SA

()

SL

(mm)

SAR

(mm x mm)

MI

(mm)

AS

(mm)

Length (mm)

MO

(mm)

MT

WD

(mm)

STS-9102/181

100.00

25.00

87.00

61x61

10.00

18.50

47.00

90.00

M85x1

65.00

STS-9160/181

159.90

25.00

142.00

100x100

12.00

18.50

47.00

90.00

M85x1

160.00

Remark: FL=focal length; SA=scan angle; SAR=scan area; MI=max. input beam diameter; MO=max. outside diameter; MT=mounting thread; WD=working distance; PW=protective windows.

 

Telecentric -Theta Lenses for CO2 10.6μm

Part No.

FL

(mm)

SA

()

SL

(mm)

SAR

(mm x mm)

MI

(mm)

AS

(mm)

Length (mm)

MO

(mm)

MT

WD

(mm)

STS-9105/181

106.00

20.00

72.00

50x50

10.00

37.37

66.00

120.00

M85x1

131.40

STS-9260/181

158.80

18.00

98.00

69x69

12.00

37.37

124.50

130.00

M85x1

227.30

 

STU2 Series Mounted 2-element F-theta Lenses

 

These doublet (STU2) and triplet scanning (STU3) lenses are intended to work with the same configuration of scanning mirrors and beam sizes as the STSL single-element lenses, but are offered at the shorter focal lengths where better performance is possible. The doublets have focal lengths from 75 to 300mm. Above 300mm the benefits of using a doublet are not great. The triplets are offered in two focal lengths, 75 and 100mm. These give diffraction limited performance and even further improvement over the corresponding doublet.

 

All the lenses are made from laser grade ZnSe. Each of the lenses comes in a black anodized aluminium mount and can also be fitted with a ZnSe protection window as an option.

 

Specifications:

Material:

All elements and protection window made from Laser Grade ZnSe.

Mount details:

See Figure 10.51.

Beam diameter:

Up to 15mm (12mm 1/e2)

Optical scan field:

+/-20 in X and Y.

Focal length:

Within 1%.

Absorption:

< 0.25% per element.

Transmission:

> 99.6% per element coated AR/AR for 10.6mm.

Damage threshold:

CW 3000W/mm at 10.6mm.

 

Part no

Field size (mm sq)

Focal length (mm)

Average focused spot dia (mm)

Standard deviation of spot dia (mm)

Working distance, WD no window(mm)

Working distance, WD with window(mm)

Max. Fq error X axis(%)

Max. Fq error Y axis(%)

STU2-10.6-50-75

50

75.0

118

25

60.27

62.03

-2.4

-2.4

STU2-10.6-70-100

70

100.0

139

22

87.57

89.34

-1.5

-1.4

STU2-10.6-105-151

105

151.4

171

0

149.06

150.84

0.9

0.9

STU2-10.6-140-200

140

200.0

225

0

213.94

215.73

1

1

STU2-10.6-175-250

175

250.0

282

0

261.36

263.17

1.3

1.3

STU2-10.6-210-300

210

300.0

338

0

312.06

313.87

1.5

1.5

 

(4) F-theta scan lenses for CO2 laser - Triple element made of ZnSe

 

Part No.

Wave-length (um)

EFL(mm)

WD (mm)

Mirror Scanning angle

Scanning area(mm)

Entrance beam size

(mm)

Mirrors separation (a2-a1)

(mm)

Last mirror to first lens(a1)

(mm)

Focused spot size

(um)

Connection thread

Total length(mm)

SL3-9.4-50-80W

9.4

80

89.4

+/- 25۫

50X50

14

18

18

84.5

M85X1

39.20

SL3-9.4-60-105Z

9.4

105

60.1

+/- 25۫

60X60

14

18

21

88.5

M85X1

86

SL3-10.6-50-80W

10.6

80

89.4

+/- 25۫

50X50

14

18

18

84.5

M85X1

39.20

SL3-10.6-60-105Z

10.6

105

60.1

+/- 25۫

60X60

14

18

21

88.5

M85X1

86

 

STU3 Series Scan Lenses

  • focal lengths 75 and 100mm respectively

  • the 75mm focal length lens is also nearly telecentric (see below) with the focused beam less than 5 to the normal diffraction limited performance over the entire image plane

  • virtually zero F-theta error

  • can be fitted with a protective window

 

Part No.

Wavelength (um)

EFL (mm)

Scan area (mm)

Entrance (mm)

Spot dia. (mm)

STU3-10.6-50-75

10.6

75

50x50

15

89

STU3-10.6-70-100

10.6

100

70x70

15

113

 

F-theta Lenses for YAG Lasers  F-theta Lenses at Other Wavelengths  Scan Mirrors     Optical Scanners (galvanometers) 

Reference: Basics of Scan Lens

Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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