Specifications.pdf

PDF 574 KB Posted Mar 11, 2025

Attached to: Aspheric Fourier Transform lens uncoated
Solicitation number: 5-B169-Q-00344-00
Issued by: Department of Energy Office of Science

About this file

Written by GovTribe AI · Mar 11, 2025

The file is a detailed technical specification for an LTP2020 Aspheric Singlet lens designed for precision optical applications. The lens is specified for a 633nm wavelength with specific optical characteristics, including an effective focal length of 500mm and a design criterion to minimize distortion for Gaussian beams over a 20 mrad field angle. The lens features two sides with different radii of curvature (left side R 869, right side R 290), made from Suprasil 3001 or equivalent glass, with stringent surface quality requirements including surface roughness of 0.3nm and very low reflectance (0.01%) at the specified wavelength.

The associated federal contract opportunity is issued by the Department of Energy Office of Science (Solicitation Number: 5-B169-Q-00344-00) for an Aspheric Fourier Transform lens. Vendors must submit a quotation including signed documentation, representations and certifications, published price list, country of origin verification, lead time confirmation, and potential discount information. The technical specifications are critical, and bids not meeting the detailed lens specifications will be automatically disqualified. Vendors are required to carefully review the attached specification document to ensure complete compliance with the technical requirements.

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LTP2020 Aspheric Singlet Specifications

2025.03.10 ver 6

Design	criterion	–	minimize	distortion	for	σ	=	1.04mm	diameter	(1/e2	points)
Gaussian	beams	originating	from	a	fixed	aperture	about	200mm	distant	over	a
±20	mrad	range	of	field	angles.	EFL≊500mm.	Linear	angle-to-position	conversion
for	image	spot	on	detector.

ISO Drawing (see full-size attached pdf image)

Wavelength – 633nm

Sag(r)= cr2

1+ 1−c2 1+ k( )r2 , c = 1

Rvertex

Left

side

Material

Right

Side

869

±10

GLASS:

Suprasil

3001

311

equiv

290

±4

K = −29.314 (hyperboloid) Nd = 1.458 @ 633nm CA 5x20 centered

CA 5x20 centered Vd -- N/A Vee coat, R≤0.01% @633nm

Vee coat, R≤0.01% @633nm 0/ -- 3/ RMSi < 2.75nm

3/ RMSa < 2.75nm 1/ 1x0.08 4/ 3

4/ 3 2/ --;5 5/ 10-5 Scratch-dig

5/ 10-5 Scratch-dig 6/ --

6/ --

Polished: Rq 0.3nm 0.01/1 mm

Wq 2.5nm 1/10 mm

Polished: Rq 0.3nm 0.01/1mm

Wq 2.5nm 1mm/10mm λ λ

PART/DRAWING REVISION DRAWN BY For:

LTP2020 Aspheric Singlet 2023.04.18 ver6 PZ Takacs V. Yashchuk, Lawrence Berkeley Lab

Asphere sag table

R [mm]

Sag [mm]

Remove [nm]

0.0 0.000000 0.0

1.0 0.000575 1.2

2.0 0.002301 4.9

3.0 0.005178 10.8

4.0 0.009205 18.6

5.0 0.014381 27.8

6.0 0.020706 37.8

7.0 0.028180 47.9

8.0 0.036802 57.2

9.0 0.046570 64.8

10.0 0.057484 69.4

11.0 0.069541 69.8

12.0 0.082742 64.7

13.0 0.097085 52.5

14.0 0.112567 31.5

15.0 0.129187 0.0

Explanation of drawing elements

LEFT	SIDE:	R	=	869±10.0mm	CX	vertex	base	radius	with	conic	constant
K	=	−29.314.	This	is	a	mild	hyperboloid.

RIGHT SIDE: R = 290 ±4.0mm CX

CA: 5x20mm centered in the lens aperture.

NOTE:

The

5x20mm

region

the

that

exhibits

the

best

wavefront

irregularity

performance

will

indicated

arrow

mark

the

edge

the

lens.

GLASS: Suprasil 3001 or 311 or equiv.

Selected for best 3D homogeneity and no striae.

0/ - : Stress Birefringence: N/A

1/ 1x0.08 : Bubbles&Inclusions: 1 of diameter 0.08mm

REQUIRE BEST POSSIBLE MATERIAL

2/ -;5 : Homogeneity&Striae class :

Homogeneity is defined by glass selection: Δn≤4 10-6

Striae	class	5	means	“No	OPD	>	30nm	discernable”.	We	need	<2nm
OPD	.

3/ : Surface Form Tolerance:

RMSa

2.75

nm:

RMSa

rms

irregularity

remaining

after

asphericity

subtracted

from

total.

This

value

corresponds

rms(fwrv)

defined

ISO

14999-4

(3.2.12).

RMSi

2.75

the

same

irregularity

error

specification

for

spherical

surface,

i.e.

after

subtracting

the

spherical

surface.

This

rms(fwi)

defined

ISO

14999-4

(3.2.8)

4/ 3 : Surface tilt in minutes of arc, corresponds to 0.05°

5/ 40-20 : Surface Imperfections. Scratch-dig specification.

6/ : Laser Damage Threshold – N/A

Surface	texture:		Checkmark	notation	according	to	ISO	10110-8	is	indicated	here.
The	specifications	for	each	surface	are:

Rq	0.3nm	0.01/2	==>	Roughness,	0.3	nm	over	spatial	period	range	of
0.01mm	to	2.0mm.

2.5nm

2/10

==>

Waviness,

2.5

over

the

spatial

period

range.

Coating spec: (Symbol: λ inside a circle) – R ≤ 0.01% @633nm

A candidate coating from the Zemax catalog is “Optimax_V633_1_46 ”.

This	is	a	V-coat	multilayer	anti-reflection	coating	specific	for	633nm
wavelength	on	fused	silica.	It	has	a	reflectance	of	3x10(-5)	at	normal
incidence	at	the	design	wavelength.

Power Spectral Density specification for wavefront measurement

The

reference

PSDs

for

wavefront

irregularities

over

the

20mm

2mm

(Low

frequency)

and

2mm

10micron

(High

frequency)

spatial

period

ranges

are

shown

the

Figure

The

measurement

configuration

for

lens

set

Fizeau

interferometer

cat’s

eye

double

pass

configuration.

transmission

flat

used

the

reference

surface

and

good

quality

high

reflectance

flat

used

the

return

element.

The

best-fit

spherical

aspherical

surface

removed

from

the

wavefront

prior

PSD

calculation.

The

wavefront

map

adjusted

for

single-pass

amplitudes.

The

PSD

computed

over

20mm

5mm

area

averaging

PSDs

computed

for

each

20mm

long

row

the

CA.

The

best-performing

20x5mm

region

needs

indicated

arrow

the

edge

the

lens,

oriented

along

the

20mm

direction.

The expression for the analytic power-law curves over each region is:

PSD f( ) = a f b where the a and b coefficients are indicated in Table 1.

Table

RMS

residual

wavefront

error

limits

over

indicated

spatial

frequency

and

period

ranges,

with

power-law

coefficients.

Freq range [μm-1]

Spatial Period range [mm] a b RMS [nm]

5(-5)	to	5(-4)	20	to	2	8.587(-15)	3.138	2.5
5(-4)	to	0.01	2	to	0.10	8.606(-09)	1.32	0.5

A	measured	PSD	with	well-defined	spectral	peaks	extending	above	the	indicated
power-law	curves	are	not	allowed.

Figure

–

Allowed

upper

limits

for

PSD

wavefront

measurement

over

the

best

20x5

region

inside

the

CA.

Piston,

tilt,

and

curvature

terms

are

removed.

Data Reporting Requirements

1.)	Screen	shots	or	plots	of	wavefront	and	surface	measurements	–	before
and	after	removing	piston,	tilt,	and	curvature	terms,	with	the	selected
masked	20x5mm	subregion	indicated.

2.)	PSD	plots	of	surface	finish	and	figure	measurements	from	inside	the
20x5mm	subregion.	Use	Blackman	window.

3.)	Unprocessed	data	files	for	surface	figure	and	finish	measurements	–
Zygo	DATX	and/or	XYZ	format,	or	INT	format.	Other	formats	by	agreement.

4.)	Unprocessed	wavefront	measurement	data	files	–	Zygo	DATX	and/or	XYZ
format,	or	INT	format.	Other	formats	by	agreement.

File details come from the government source that posted it. Updated Mar 11, 2025.