CO2 Laser Scan Lenses (f-theta Lenses)

(Reference: Basics of Scan Lens)
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Symbols 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-10.6-70-100

101.3

70x70

101.39

181

116

STSL-10.6--105150

149.1

105x105

150.59

219

171

STSL-10.6-120-175

175

120x120

177.39

243

200

STSL-10.6-125-180

179.2

125x125

179.23

247

205

STSL-10.6-140-200

200.6

140x140

203.53

269

230

STSL-10.6-155-225

225.5

155x155

227.96

296

258

STSL-10.6-175-250

249.4

175x175

253.26

320

285

STSL-10.6-210-300

298

210x210

302.56

373

341

STSL-10.6-250-360

362.6

250x250

368.19

445

415

STSL-10.6-280-400

394.4

280x280

401.44

481

451

STSL-10.6-300-435

432.7

300x300

440.97

525

495

STSL-10.6-340-482

482

340x340

492.3

581

551

STSL-10.6-415-600

591.7

415x415

586.5

717

677

STSL-10.6-500-720

716.5

500x500

730.03

850

820

STSL-10.6-680-977

977.6

680x680

977.6

1151

1118

STSL-10.6-840-1150

1183

840x840

1205

1389

1353

STSL-10.6-850-1200

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, STDC Series
    
 

Model

Scan area (mm)

WD
(mm)

EP (mm)

Scan angle(º)

FD (mm)

Rectangular

Round

STDC-30

36×36

f51

72

11

15

25

STDC-60

60×60

f86

97

11

20

25

STDC-80

80×80

f113

102

11

25

25

STDC-90

90×90

f128

119

11

25

25

STDC-110

110×110

f156

151

11

25

25

STDC-110-14

110×110

f156

146

14

30

23

STDC-125

125×125

f177

175

11

25

25

STDC-175

175×175

f247

252

11

25

25

STDC-200

200×200

f283

294

11

25

25

STDC-250

250×250

f352

371

11

25

25

STDC-300

300×300

f424

447

11

25

25

STDC-350A

350×350

f497

531

11

25

25

STDC-350B

350×350

f497

427

11

30

25

STDC-400A

400×400

f566

608

11

25

25

STDC-400B

400×400

f566

506

11

30

25

STDC-500A

507×507

f718

772

11

25

25

STDC-500B

500×500

f708

616

11

30

25
 

Model

EP(mm)

Scan angle(º)

Scan area (mm×mm)

Spacing#(mm)

WD (mm)

Focused beam dia.(um)

Center

edge

STDC60-20

20

20

60×60

30

122.5

278

300

STDC80-20

20

19

59×59

33

128.5

247

264

STDC90-20

20

17

60×60

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.
 

(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) µm

Spot size
(off axis) µm

EP
(mm)

Scan angle
(º)

FD
mm

Rectangular

Round

STC-40

95

36×36

51

115

135

11

20

27

STC-80

118

80×80

113

120

140

11

27

16

STC-110

145

110×110

156

210

225

16

30

17

STC-125

188

125×125

177

235

285

16

30

17

STC-175

257

175×175

247

245

300

16

30

18

STC-200

294

200×200

283

320

365

16

30

19

STC-250

360

250×250

354

330

375

16

30

20

STC-300

433

300×300

424

385

430

16

30

20

STC-350

502

350×350

495

400

450

16

30

20

STC-400

569

400×400

566

420

485

16

30

20

STC-500

803

500×500

718

460

520

16

30

21

STC-700

960

700×700

990

530

680

16

30

21
 
YAG Laser Scan Lenses  Scan Mirrors     Optical Scanners (galvanometers) 

Reference: Basics of Scan Lens