供应 LightSmyth Focusing Gratings 聚焦光栅

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7. Focusing Gratings聚焦光栅

LightSmyth’s family of flat-substrate focusing gratings are designed foruse with external-cavity lasers. The gratings focus optical input signals whilesimultaneously spectrally dispersing them. The focusing function isincorporated into the gratings via holographic design principles using curvedand variably-spaced grating lines. Integrating focus function with spectraldispersion through holography rather than by use of curved substrates or lensesreduces system component count and facilitates miniaturization.

Flat-substrate focusing gratings are also relevant to a broad range ofapplications in spectroscopy and general photonics. For example, fiber coupledminiature spectrometers may be build with minimum number of components: inputfiber, focusing grating and output detector array. Such spectrometer may providespectral coverage of several hundred nanometers and nm-level resolution on lessthan 15 x 15 mm footprint.

LightSmyth’s flat-substrate focusing gratings are optimized forimplementation in external-cavity diode laser (ECDL) systems where they providefrequency-selective feedback and thus laser frequency stabilization andlinewidth narrowing. The gratings are designed for ECDLs employing the Littrowconfiguration and focus the first-order diffracted beam back toward the laserproviding tunable locking feedback. Grating focal lengths are short (3.75 mm)in order to facilitate large longitudinal mode spacing and to enable convenientwide-range single-mode tuning.

Grating groove depth and duty cycle are optimized to provide maximaldiffraction efficiency. Each grating is a master, free from replication flaws.Grating surfaces are cleanable and abrasion-resistant.

7.1 Standard Flat-Substrate FocusingGratings标准平板基板聚焦光栅

The focal length of allgratings is 3.75 mm. All gratings are designed to provide laser feedback viathe first diffraction order. The working distance between grating and laserdiode front facet is d = 7.5 mm for all gratings. Silicon substrate has athickness of 0.73mm. Substrate height and width tolerances are 0.3 mm. Gratingsubstrate: single crystal silicon. Grating coating: aluminum (other coatingtypes are available at additional charge).

Part Number	Design Wavelength (nm)	Design Input Polarization¹	Incidence Angle¹ φ	Approx. Line Density²(l/mm)	Size ¹(w × h)
SCG-405S-0603A-Al	405	s	40 °	3175	6 mm × 3 mm
SCG-405P-0306A-Al	405	p	45 °	3640	3 mm × 6 mm
SCG-635S-0603A-Al	635	s	40 °	2028	6 mm × 3 mm
SCG-635P-0306A-Al	635	p	65 °	2857	3 mm × 6 mm
SCG-780P-0306A-Al	780	p	60 °	2222	3 mm × 6 mm

Part Number

Design
Wavelength
(nm)

Design Input
Polarization¹

Incidence
Angle¹ φ

Approx. Line
Density²(l/mm)

Size ¹(w × h)

SCG-405S-0603A-Al

405

40 °

3175

6 mm × 3 mm

SCG-405P-0306A-Al