Investigation of the Single-Point Diamond Turning of Optics-Grade Germanium Substrate

Yıl 2026, Cilt: 38 Sayı: 1, 347 - 357, 29.03.2026

Kamer Dorukhan Kesme , Tahsin Aydın , Ekrem Yartaşı

https://doi.org/10.35234/fumbd.1814500

https://izlik.org/JA59RH33KB

Öz

This study investigates the influence of cutting parameters on surface roughness (Sa) in diamond turning of optical-grade single-crystal germanium lenses. Specimens (Ø40 mm, 2 mm thick) were machined on an ultraprecision single-point diamond turning (SPDT) lathe; surfaces were characterized using Fizeau and white-light interferometers, accompanied by surface topography maps. Experiments followed a 3×2×2 factorial design (V: 1000–3000 rpm; d: 3–6 μm; fr: 2–5 mm/min) with constant tool geometry (rake γ = −25°, clearance α = 10°). The best Sa achieved was 1.065 nm, well below the accepted 4.640 nm threshold. From the measurements, two predictive models—linear and nonlinear—were established to relate Sa to the process parameters. The design enabled rapid exploration of settings and interactions (V–d–fr). The models provide practical tuning windows and sensitivity guidance to reach the 1–3 nm target band. Overall, the study offers a deployable framework for in-process optimization.

Anahtar Kelimeler

Surface roughness , optical metrology , factorial design , germanium substrate

Etik Beyan

This study did not require ethical approval.

Destekleyen Kurum

Sivas University of Science and Technology

Proje Numarası

2024-YLTP-Müh-0009

Teşekkür

This study was supported by the Scientific Research Projects Unit of Sivas University of Science and Technology under project number 2024-YLTP-Müh-0009.

Optik Kalite Germanyum Alttaşın Tek Nokta Kristal Elmas ile Tornalanmasının İncelenmesi

https://izlik.org/JA59RH33KB

Öz

Bu çalışma, optik kalite tek kristal germanyum lenslerin tornalanmasında kesme parametrelerinin yüzey pürüzlülüğü (Sa) üzerindeki etkisini incelemektedir. 40 mm çap, 2 mm kalınlıktaki numuneler ultra hassas tek nokta elmas tornalamada işlenmiş, yüzeyler Fizeau ve beyaz ışık interferometreleriyle karakterize edilmiştir. Sa değerlerine eşlik eden topografik yükseklik haritaları türetilmiştir. Deneyler, 3×2×2 faktöriyel tasarım altında yürütülmüştür (V: 1000–3000 rpm; d: 3–6 µm; fr: 2–5 mm/dk). Takım geometrisi sabit tutulmuştur (talaş açısı γ=−25°, boşluk açısı α=10°). En iyi Sa değeri 1.065 nm olarak elde edilmiş ve bu değer kabul edilen 4.640 nm sınırının belirgin biçimde altındadır. Ölçümlerden elde edilen veri setiyle, Sa’yı parametrelerle ilişkilendiren lineer ve lineer olmayan iki tahmin modeli kurulmuştur. Tasarım, üretim ayarlarının hızlı taranmasına ve etkileşimlerin (V–d–fr) anlaşılmasına olanak vermiştir. Modeller, 1–3 nm hedef aralığına inmek için pratik ayar pencereleri ve duyarlılık bilgisi sağlamaktadır. Çalışma, yerinde proses optimizasyonu için uygulanabilir bir çerçeve sunar.

Anahtar Kelimeler

Yüzey pürüzlülüğü , optik metroloji , faktöriyel tasarım , germanyum alttaş

Etik Beyan

Hazırlanan makalede etik kurul izni alınmasına gerek yoktur

Destekleyen Kurum

Sivas Bilim ve Teknoloji Üniversitesi

Proje Numarası

2024-YLTP-Müh-0009

Teşekkür

Bu çalışma Sivas Bilim ve Teknoloji Üniversitesi Bilimsel Araştırma Projeleri Birimi 2024-YLTP-Müh-0009 numaralı projesi tarafından desteklenmiştir.

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